6dj8 cathode follower

• One 12AU7, two 12AX7, and one 6DJ8. For example, when using a single cathode follower circuit, we do not load a 6DJ8 with a 200-ohm cathode resistor (twice the effective output impedance), even though that value would adhere the 2rp rule; rather we use something like 10-20k. The headphones were a pair of Sennheiser HD420. The Rout at cathode = 90r, and Vo = 0.96 x Vg input, so the exact Vg can be calculated = Vk / 0.96. For the cathode follower - the Philips JAN 6922, which sounds terrible as an audio tube - works great, and does not loose anything to the Siemens in the CF position. LJ 6DJ8 ECC88 6922 Tube Line Buffer. ... Well, we can replace the CCDA's cathode follower with an anode follower. The SRPP ambit has additionally been referred to as a SEPP, Totem Pole, Mu Follower, Mu amplifier and Cascoded Cathode Follower. Moreover, it matches the Broskie cathode follower's gain, i.e. I've read that PI and cathode follower tubes run at higher voltages than the other preamp tubes and the higher voltage yields a shorter tube life. In all, 13 tube circuits are covered, each one divided into four variations. If a 6DJ8 is used, and if a low B+ voltage is used, say 150Vdc, then we can probably get away with it, as the cathode follower's cathode will not be at too high a voltage to exceed the cathode-to-heater maximum voltage. Low output impedence; Delayed startup; 14 6DJ8 tubes; Selected Specifications Moving Coil Input. Building, troubleshooting and testing of these amplifiers should only be performed by someone who is thoroughly familiar with the safety precautions around high voltages. Hybrid because it utilizes ultra low noise op-amp ICs in the input stage and a tube (6DJ8) output stage in cathode follower arrangement. Equipped with sophisticated power supply which provides four independent DC power supplies. The 12AU7 has the smallest, at just 20. Wow, thank you for posting the pictures. Page 2. I just tried a cascode using a quad of 2N4401 to drive the cathode of a 6DJ8 and to allow use with high impedance sources, I used a darlington coupled emitter follower 2N4401 to drive the other 4 bases. The 6DJ8-based cathode follower presents an output impedance of about 100 ohms, plenty low enough to drive the passive RIAA equalization network. V7- V8 Cathode follower V5- V6 Top half of cascode V3- V4 Bottom half of cascode V1- V2 Voltage amplifier Signal flows from thru odd numbered tubes V-1 to V-7 for left channel, V-2 to V-8 for right. That puts the 6AS7 with transconductance of 7000 at about 142ohms. Limited Time Sale Easy Return. 6DJ8 with cathode degeneration. Specifications The reason is the cathode output behaves like a cathode follower. The remainder of the tube is a plate detector, the cathode of which is common with the cathode follower amplifier. For the record, these are: Cascode, cathode follower, common cathode, differential amplifier, grounded cathode, grounded grid, I to V converter, long tail phase splitter, plate follower, push-pull, split-load phase splitter, totem-pole, and white cathode follower. Two of these tubes in parallel would make this Rp be half, And R4 becomes 15K, and the equivalent resistance of that change is 1.21K vs the old 2.64K. Yes, you can use 6DJ8 instead. Don't ditch those 6ES8. The Tetra Sans PS PCB holds two tube-based phono-stage preamplifiers, with each phono preamp holding two CCDA gain stages with a passive RIAA … One could use a well made cathode follower buffer shown in Fig 4 with paralleled 6DJ8. V11- V12 Cathode follower V9- V10 Voltage amplifiers Signal flows thru two gain stages, V9 uses each triode as a gain stage for the left channel with V11's triode sections paralleled for the cathode follower, ditto for V10 and V12 for right channel. Now a 6DJ8-based cathode follower usually offers an output impedance of about 100 ohms; this Aikido plate follower's output impedance will prove far lower, as the negative feedback loop will lower the impedance to below 10 ohms. The E88CC has. Another one that looks promising (maybe) for a follower is the ECC99. This preamp is by far my favorite. -- Harga belum termasuk tube. A 6dj8 is good choice for a cathode follower because it has a mu (amplification factor) = 33 and a rp (plate resistance) = 2.65 K ohms This gives the follower a Zout = rp / ( mu + 1) = 78 ohms which is quite low for a tube preamp Rc will increase Zout, but it can be by passed with a cap. Triggering can be from the internal pickoff or from an external signal, or "line" trigger via a 6.3 V tap on the power transformer. Alexander Zeus Dionysos. 32.9k Followers, 540 Following, 526 Posts - See Instagram photos and videos from Cathode Cinema (@cathodecinema) The 6DJ8 has to cathodes, two grids, two plates, one heater and one internal shield, for a … It has been in my system continuously for that long because it sounds so good. Zeus is a Moving Coil (MC) - Moving Magnet (MM) hybrid Phono preamplifier. The SRPP ambit has additionally been referred to as a SEPP, Totem Pole, Mu Follower, Mu amplifier and Cascoded Cathode Follower. Equipped with sophisticated power supply which provides four independent DC power supplies. Of course satisfactory performance in output voltage swing can be provided using a high voltage tube, such as for example, a 6DJ8 as a cathode follower. Also known as the , the E88CC was originally targeted for test equipment and radar. Next on my agenda is a conversion of Shanling CD Player from 6922 to 6H6P and then from tube triode cathode follower buffer to a true lampizator status. The whole point is using it properly and, if it doesn't work, this is the fault of the designer, not the circuit, period. Standard tube is 12AU7/ECC82/ECC802S. However, the MX-110 was designed to use the 6D10 for V3, and a 6DJ8 was adopted in the PS-6C at V3, to use as the cathode follower. 1: White cathode follower and Complex cathode follower (15.07) Posted by Eric Chan on 2003-01-22, 18:33:14 (161.114.1.182) Could someone in this forum give me some information/basic calulation regarding the following two topology 1. M2 Preamp. Gain = mu² + murp/Ra (mu² + mu + 1) + (mu+2)rp/Ra Zo = 1 / [ (1 + mu)/ (rp + Ra) + 1 + mu (mu + 1)/ (1 + rp/Ra) ( (mu + 1)Rk + rp) ] The dummyloads are still in and the bottom is not yet properly mounted. (the grid of the 6dj8 cathode follower is a voltage divider 100k on top and 500k to ground ,whi ..... 69: Tube DIY Asylum, RE: cap size question picture (0.00) Posted by genelex on 2013-07-04, 09:20:40 (72.76.12.31) But then you have to raise B+ to 200V & add a common plate current limiter of say 100R to the 4 cathode followers. But they have sonic problems: They loose information. In addition, the ACF-2 produces a tad bit less distortion than comparable cathode follower by using the triode s own nonlinearity against itself. For the parallel connected cathode follower the E288CC is well suited, delivering higher currents and an output impedance of 25 Ohm. (I have many old GEs I wanted to use, and converting to 6SN7 means simply changing the hookup to the 24V filament transformer). A cathode follower based on the 6BL7 or 6BX7 is ideal for output. I have tried rolling several different brands of 6dj8 and 6922 variants. Because the 7044 tubes are cathode follower buffer, I didn't think that they would make much difference. Tube elements 1, 2 and 3 perform as a cathode follower amplifier. This is an assembled board of headphone amplifier of outstanding performance . Output impedance is roughly 1/transconductance for a cathode follower. Thus the 6DJ8 produces little THD, and j-fet produces most of the measured THD. so to get the input to the RIAA circuit right, add 2.64K-1.21K = 1.42K between the plates and R5 of the RIAA circuit. We just spent a long time optimizing both the input and output topology to maximize current delivery, and to reduce output impedance. In its heyday in the ‘50s, the 6DJ8 was the American designation, with "6" denoting the filament voltage and "8" representing the number of internal elements, though the counting is not strict. Line cathode follower: SUBSTITUTION TYPES: 6DJ8 ECC88, E88CC, E188CC, ECC808, 6922, 7308: 12AX7 ECC83, E83CC, ECC803, 7025, 7729, 6681, (Not 5751) 12AU7 ECC82, E82CC, ECC802, E182CC, 6189, 6680, 7730: WARRANTY: Your SL-1 Signature is warranted for six months from date of purchase. These conditions could be fulfilled very good with the 6DJ8, ECC88 tube type family. Will probably change the volume control to a 6dB stepped attenuator for better high frequency re-sponse. This entailed quite a few tweaks to the common-cathode front end, adding a new negative voltage rail and current source to up the overall gain, and also changes to the White cathode follower output. Split-load phase inverters split the signal between the plate and cathode, each side being 180 degrees out of phase. The reason I ask is that I'd read something about driver tubes/cathode followers and the ECC88 was mentioned because of it's linearity. The present 19,38 and 67kHz attenuation really sucks. Just like the Broskie cathode follower circuit, this MOSFET version converts the balanced input signal into an unbalanced output signal. 1 volt at the … the Power Follower original design by Andrea Ciuffoli - 1999 - 2014 ... 6DJ8 / ECC88 / E88CC / 6922 accept a max Vkf (cathode to filament voltage) of 100V so it is necessary refer the filament ground to 70V because the upper tube cathode voltage is … 220k members in the electronics community. As noted below much of the "Myth" was probably associated with 6ES8 being relabelled as 6DJ8. Chameleon PC-1T Active Board with single 6DJ8/6922/6N23P which is operated in Grounded Cathode mode is the standard Active Board for Chameleon. Chiu compared his original Morgan Jones amplifier to a LT1010 buffer headphone driver and a tube headphone amplifier (a “monster” 6AS7G cathode follower driven by a 6DJ8 diff amp) he had built earlier. Hybrid because it utilizes ultra low noise op-amp ICs in the input stage and a tube (6DJ8) output stage in cathode follower arrangement. > Mr. Merlin say that probably 4 is the max number You first need to boost-up weak signal by 1:15; or mix strong signals and have gain of 15 after the mix network to get back to a strong signal. If the filament or heater is operated for long periods at reduced voltages, the effect is a reduction in emission, but no damage is generally done to the valve unless the cathode currents are sufficient to exhaust the “space charge. The ECC88, 6DJ8, CV 2492 are high performance valves that have passed rigorous military specification tests regarding ruggedness, heat and shock resistence, and heater longevity. CF operation does not change the IV dynamics that the tube must undergo. The output voltage is relatively insensitive to changes in the cathode resistor especially when the value of the resistor is large compared to the output resistance of the tube. Another 12AT7, used as a cathode follower, picks up the phono signal from there, lowering the impedance and driving the volume control. The SRPP circuit has also been referred to as a SEPP, Totem Pole, Mu Follower, Mu amplifier and Cascoded Cathode Follower. The 6DJ8 has a mu of 33, and S=12.5, and if I did the Rp calculation right, the plate resistance is 2.64K. Also, in the CF position, a pair of Amperex Bugle Boy 6Dj8, which had started hissing, farting etc, in my D70 amps, and were headed to the garbage can, sounded even better. Menggunakan 1 tabung 6DJ8/ECC88 (fam: 6922, E88CC, 6h1n), stereo, bersuara enak, komplet, dan flat natural. 624 votes, 67 comments. Zeus is a Moving Coil – Moving Magnet hybrid Phono preamplifier. The voltage on the plate of the bottom tube is 97V. The cathode follower has a low output impedance but it is not more load tolerant than common cathodes. In addition, the ACF does not invert the phase. Here is the deceptively simple schematic Bruce shared on the project page. This design uses one 6DJ8 dual triode for each channel. The triode is wired in a push-pull configuration with a small line matching transformer. The values that express the amplification degree of these tubes are, for the 12AX7; μ=100, the … In fact, a cathode follower loaded by a constant-current source at its cathode will leak 1/mu of the power-supply noise at its cathode. Therefore, I need a gain of only about 10 to push the output stage to full power. PC-5T: Grounded Cathode Amplifier/Follower for 12V tubes. Incidentally, the 88PB actually uses 7DJ8s, however, 6DJ8s,6922s or 7308s may be substituted.I'm with John_tracy, I prefer the 6SN7 to … A DISCLAIMER_ THE 6N6P IS NOT SUITABLE FOR LAMPIZATORS WORKING DIRECTLY WITH CURRENT OUTPUT DAC CHIPS LIKE TDA1541A. Both of each tube's triode sections are run in parallel for each stage. The trigger circuit is a 6DJ8 trigger amplifier followed by a 6DJ8 Schmitt trigger. I got 0.36 uV of input noise, with input grounded. Changing the tube to a 5998 with transconductance around 14000 gets you down to 72 ohms. Standard chassis style, high quality, line pre-amplifier with 5 inputs and two outputs. The is described as being for use in cascode circuits and as a multivibrator and cathode follower in References: Datasheet & private correspondence. Richer sound I assume. If you need more gain, try the 6DJ8 (750Ω cathode resistor for 6mA and gain of 14), although audiophiles will argue about sound quality of the type. 6DJ8 6922 6H6 White Cathode Follower WCF Class A Tube Headphone Amplifier AMP The headphone amplifier is based on WCF (white cathode follower) circuit which invented by Morgan Jones, 6N11 can be subsitutated by 6922 ECC88 CCa, You can taste different sound by changing tubes,That is what audiophile like to do. Actually, even with the wiring changes to get the pin mapping correct, this simply won’t work. The cost of eight new-production 6DJ8 tubes is about $128 USD, which may seem high, however, until you price NOS 6DJ8 tubes from the 1960s or one current-production 300B. Dropping Heater Voltage. The circuit in question is designed for the specific characteristics of the 6DJ8. I'm looking at the 12DW7 too as a cathode follower to maybe provide more current for the driver section in a power amp. Plan to use plenty of LC traps and filtering here, along with a proper de-emphasis filter. Cathode Drive (RF) (Grounded Grid) High-Mu Triodes 6J4 8058 8532 6. This is one of abounding accessible variations for a Symmetrical SRPP Preamplifier based about the 6DJ8 / ECC88 ancestors of tubes. Tube Preamplifier Circuit 6DJ8 / ECC88 SRPP. For example, a 6DJ8—placed in a cathode follower circuit—has a lower Zo than a 6AS7 in the same circuit (80 ohms vs. 93 ohms); however, the 6AS7 will put out much more power, as its ten-times-lower rp allows ten times more current to flow into the same load with the same B+ (assuming a low impedance load, say 32 ohms). Originally, there were consumer versions (like ECC88 & 6DJ8) and PRO-versions (like E88CC & 6922). 2 x 6DJ8/6922 – Output stage cathode follower 6 x 12AX7 – Phono preampliﬁer section IMPORTANT: USING YOUR VACUUM TUBE PREAMPLIFIER • Do not unplug an interconnect while the preampliﬁer is on • Do not plug your preampliﬁer into an ungrounded power socket • Be sure to turn on source components and preampliﬁer ﬁrst The circuit uses a E88CC as input ( for both channels) and one 6H6N as class A SE output for each channel. Grid input Rin > 11M0, and Cin < 30pF, easy to make with a bootstrapped 470k Rg as I show in Fig 4. White Cathode Follower As an example, given a setup that consists of a 6DJ8 with a bypassed cathode resistor of 200 ohms and a 10k plate resistor, the results are Gain = 0.97 Zo = 3.44 ohms PSRR = -65 dB. The company’s new focus led to the Modulus 1 preamplifier, introduced in 1983 at $449. In other words, the cathode follower's output voltage swing can only get to within 2.75V of the ground potential. 12AX7 vs 12AT7 vs 12AU7: Differences Explained. The heater voltage should be kept within +/-10% of its nominal value for optimum valve performance. Sounded great, no reliability problems. 6DJ8 6922 6H6 White Cathode Follower WCF Class A Tube Headphone Amplifier AMP 26.88 - 54.72 $ Find out shipping costs Go to store Link copied to clipboard, share it Or send it to social networks Click to share the product Price increased by 9.93 $ Higher than average, a lot Reliable seller: 89% Above average, safe to buy, ChinaAudio Store Here, the cathode follower uses a low voltage tube such as the 6GM8. Equipped with sophisticated power supply which provides four independent DC power supplies. used for cathode and plate follower feedback on the output. Tube Preamplifier Circuit 6DJ8 / ECC88 SRPPThis is one of abounding accessible variations for a Symmetrical SRPP Preamplifier based about the 6DJ8 / ECC88 ancestors of tubes. Mechanical. 4 tubes will further reduced the O/P Z of the amp from around 100R (O/P Z of 1/2 6DJ8) to 100R/4=25R. Also, various tubes were considered for use in the final driver including 6SN7, parallel 6SN7, 5687, 6DJ8, 6BX7, 6BL7, and 6AS7. But Cathode Followers do provide the low output impedance that is often needed, especially on the main output of pre-amps. As with all Counterpoint preamps, there are two gain stages in the phono section with passive riaa equalization. This detector, V-11 is designed especially for SSB reception. The PCB holds one CCDA (Constant-Current-Draw Amplifier) gain stage and one RC B+ voltage filter and two output … PC-3T: Grounded cathode amplifier for 12V 9-pin mini tubes. … Standard tube is 6DJ8/6922. A single gain stage based on the CCDA topology, the CCDA Mono Noval PCb will find many uses, such as line-stage amplifiers, front-ends to single-ended power amplifiers, and even headphone amplifiers. Cascode front end on phono stages and voltage gain stages, cathode follower outputs for low impedance, no loop feedback. The one amp I've had with a cathode follower was a Dr Z MAZ Jr. Page 1. Not state of the art, but Good Enough. “"If I have been able to see further, it is because I have been surrounded by midgets" - Murray Gell-Man Best coffee on … Page 6. Oxide-coated cathode resistor, in turn will cause the rogue. Its output impedance, on the other hand, it not so hot. The following variation makes use of a cathode follower to achieve at least three goals: lower output impedance, a constant-current draw, and lower distortion. My current favorite is the Amperex orange globe 6dj8 (with splatter shield). It was just lifted out of the workshop. I used a mu-follower circuit with no feedback, a 12SN7 as the gain stage, and a 6BL7 as the cathode follower/current source. The PCB is small, being only 3 inches by 5 inches big. THD in 6DJ8 is very much reduced because j-fet Rd acts as very high cathode Rk = Rd + ( Gm x Rd x Rs ) = 80,000 + ( 0.04 x 80,000 x 44r ) = 220k. The -10dB A reduction reduces j-fet THD by factor 0.36. Cathode Follower Medium-Mu 6814 Triodes 8056 Medium-Mu Twin Triodes 5670 6350 7044 5687 6922/E88CC 7308 5965 7. PC-4T: Grounded Cathode/Follower amplifier for 6V tubes. 6N6P, 6N1P, 6CG7/6FQ7. To make two WRONGS make a WRIGHT (Appologies Allen) what you do with the 6ES8 is run it as a Miss Piggy (Cathode Follower) at around Va = 150V and Ia = 10mA as the output of a line stage. Page 3. The output stage is DC coupled to the gain stage. cathode follower amp srpp power amplifiers, lunchbox amp monster party hat, preference for preamp tubes 12au7 or 6922 6dj8, 12au7 tube preamplifier circuit zone com electronic, line level preamp 2003 turneraudio com au, 12au7 ecc82 cathode follower • Symmetric layout design and signal paths with minimum parasitic. 6DJ8 ratings: ECC88 = 6DJ8 130V/1,8W E88CC= 6922 220V/1,8W E188CC= 7308 250V/2W Tube line buffer "kelas atas" namun tidak mahal. Page 4. Many 12V types usable with adjustments. 93. Many guitar … Many other 6V types can be used. Here are some notes for a 6dj8 / ecc88 srpp tube preamplifier which i checked on tubecad, but i don't recall distortion values. 0.5 (-6dB). Page 5. Found 155 records in Search of Tube DIY Asylum. It came with new production Svetlana branded 12AX7 in V1 and V2. The 12AX7 has a gain factor of 100, while the 12AT7 has 60. The drive stage comprises two series connected vacuum tubes which share the large static and dynamic voltages of the drive stage so as to provide a drive signal having a large voltage swing, without generating audible distortion and … It is a mixer type circuit that takes the output of the BFO and mixes it with the output of the 455 KC IF. Later units have a … The 6.3Vdc negative power-supply rail allows us to supply both the constant-current source and possibly the tube's heater. This is my first tube amp built three years ago. RIAA1 Schematic (417A based with cathode follower) RIAA2 Schematic (417A based) RIAA3 Schematic (6DJ8 based) RIAA4 Schematic (12AY7/6072A based) RIAA5 Schematic (12AY7/6072A and 6DJ8 cascode input stage). The final stage are cathode follower provided by 6DJ8 • Two single-ended inputs and two single-ended outputs. E88CC input 6H6N output White Cathode Follower headphone amplifier assembled ! A subreddit dedicated to news, articles and general discussions related to … • First two amplification stages consist of 12AU7 in common cathode and then 12AX7 in SRPP. > into a Cathode Follower No, you don't need high impedance. Zeus is a Moving Coil - Moving Magnet hybrid Phono preamplifier. Here's a quick thought experiment. 6SN7 as no feedback anode follower, choke coupled power supply with 6X5 valve rectifier and ECL82 regulator. The biggest difference between these power tubes is the amount of gain they will provide. This unity-gain buffer, using a modified cathode follower, offers a high input impedance, a low output impedance, low distortion, and a great PSRR figure. With 16 inputs the output is 1/15th of one input. For the I-out DAC types allways use 6N2P! The data sheet for a 6dj8 says 6.3 V @ 365 mA per tube. Beyond that, phono and line signals alike are amplified by a single 6DJ8, grounded-cathode gain stage with 20dB of gain. A cathode-follower power output stage is driven by a novel drive stage to provide with low distortion the large signal required to drive the output stage. Hi John, You are completely correct, if you had the 'AS7 plate loaded. The Steelhead can be improved a lot with a good NOS tube. Several low impedance driver options came to mind including interstage transformer (step-down), Mu-Follower, SRPP,White-Follower, and Cathode Follower. On the PC-1T you can have “degenerative cathode feedback”, know as local feedback, or no local feedback. Clipper Twin Diodes 7055 8. This circuit would make an excellent core to … Page 7. But you do need GAIN (with low noise). The Aikido cathode follower PCB/kit is a modest affair, consisting of one tube per channel (two triodes per tube envelope) and a handful of capacitors and resistors. Rk is very low: about 50-60 ohms to generate 0.5V with 10mA target idle current. Cathode resistors R2 and R4 should also be identical to maintain vertical symmetry. A change to the 12AU7 would require a complete redesign of the White Cathode follower output stage. The obvious tube choices are the 6CG7, 6DJ8, 12AU7, 12BH7, and ECC99. tubes 12au7 or 6922 6dj8, class a 12au7 tube headphone amplifier circuit zone com, valve amps pre amp and driver lenard audio, 12au7 tube preamplifier circuit zone com electronic, 12au7 ecc82 cathode follower tube preamplifier schematic, 12ax7 or 12au7 which one is the preamp tube audioshark org, 12au7 tube Page 8. The Aikido cathode follower PCB/kit, in contrast, is a modest affair, consisting of one tube per channel (two triodes per tube envelope) and a handful of capacitors and resistors. This unity-gain buffer, using a modified cathode follower, offers a high input impedance, a low output impedance, low distortion, and a great PSRR figure. A high-transconductance (high-gm) tube, such as the 6DJ8, has a gm of 10-13mA/V (i.e., 10,000-13,000 µmhos). But a triode with high gm is not necessarily a high voltage-gain triode; the 6DJ8 has almost 10x the gm of the 12AX7, but one-third the mu (voltage gain). … My very first project with tubes was an Aikido cathode follower preamp, using 6DJ8's that you were kind enough to gift me in that care package you sent about 9 years ago. An operating point with a plate voltage of only 80V is well between the limits and the gain µ of 33 is well enough. 6DJ8 / ECC88 SRPP Tube Preamplifier Schematic This is one of many possible variations for a Symmetrical SRPP Preamplifier based around the 6DJ8 / ECC88 family of tubes. So what? Line Stage on left, four tubes: V11- V12 Cathode follower Rather than grounding the 1M grid leak resistor directly it goes to a 1.5V lithium battery (measures 1.8V, positive to ground) for bias. Cathode-Coupled, Direct-Drive(RF) Medium-Mu Twin Triodes 6DJ8/ECC88 6922/E88CC 5. If you are using a good Single Ended power amp (I say 'good' as all SE amps are not created equal) or something equally revealing, then the loss is crucial. Cathode followers are used as buffers or impedance converters where a low output impedance is needed but the the preceding stage needs a light load to amplify properly. If you configure a 6DJ8 as a White cathode follower, it will do fine for phones in the 600 ohm impedance range. Cheap Amplifier, Buy Quality Consumer Electronics Directly from China Suppliers:6DJ8 6922 6H6 White Cathode Follower WCF Class A Tube Headphone Amplifier AMP Enjoy Free Shipping Worldwide! May need a cathode Let's take the common 6080/6AS7G OTL cathode follower amps. As this circuit stands, no Aikido mojo obtains. It will deliver more current juice to the headphone. All versions (12AY7 line stage, and the first versions of the 6DJ8 design) have a gain stage followed by a cathode-follower. Low Voltage Plate Follower 6DJ8 Buffer Power Supply | diyAudio WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES. What distinguished the Modulus, besides its remarkable price, was the use of 6DJ8 dual-triode tubes, instead of 12AX7 tubes with cascode circuits, cathode followers, and negative feedback. 6DJ8 – Wikipedia. In other words, the ACF-2 greatly improves on the cathode follower's already fine PSRR. So really these tubes, 6DJ8, 12AX7, etc, are only good for MM carts. The remaining problem of a poor PSRR could be fixed by using an Aikido cathode follower (ACF) in … Converter Pentagrid Converters 12SY7 26D6 5750 9. For 6.3V heaters that means 5.7V to 6.9V, though it is even better to stay within +/-5% if you can (6V to 6.6V). Set these depending on tube type. (Another possible output tube type is the 6H30 or 5687 or ECC99.) The quality REALLY is different. Like their civilian/industrial counterparts, they have the four moulded seams on the top, heavily plated gold pins, a halo top getter with a The Tetra Sans PS's FR-4 PCB is extra thick, 0.094 inches (inserting and pulling tubes from their sockets won’t bend or break this board), double-sided, with plated-through 2oz copper traces, and the boards are made in the USA. There is a 6DJ8 differential trigger pickoff amplifier followed by half of a 6DJ8 a cathode follower, buffering the trigger signal. White cathode follower 2. E88CC-TK TUBE DATA SHEET. Amplifiers Tubes / Valves But if it was cathode follower, and the load voltage was in series with the input voltage, then 1.72 volts between grid and cathode would still be needed for. Alternatif tube ada di etalase, mulai Rp150.000. 4. The SRPP circuit has also been referred to as a SEPP, Totem Pole, Mu Follower, Mu amplifier and Cascoded Cathode Follower. It is dual mono, based on Fred Nachbaur´s MiniBlok SET with 13EM7 tubes. But many other tubes could be used. The load of my 01A pre was changed from a simple resistor and cathode follower, DN2540 CCS, plate choke and now Gyrator. You cannot fool the time :-). Whenever I thought that a change was good and happy, I got to think again after long hours and days of listening. Electronics. Hybrid because it utilizes ultra low noise op-amp ICs in the input stage and a tube (6DJ8) output stage in cathode follower arrangement. Follower with an anode follower, choke coupled power supply which provides four independent DC power supplies question designed! Will probably change the volume control to a 6dB stepped attenuator for better high frequency re-sponse input... The input to the RIAA circuit own nonlinearity against itself Schmitt trigger common 6080/6AS7G cathode. Four independent DC power supplies 's FVP page < /a > 624 votes, 67 comments ''... About 142ohms Low-Voltage Class-A tube Headphone amplifier of outstanding performance small line matching transformer for both channels ) and 6H6N! Parallel connected cathode follower the E288CC is well Enough to think again after long hours days. Measured THD 's triode sections are run in parallel for each channel in and the bottom is not for! And line signals alike are amplified by a single 6DJ8, grounded-cathode gain stage, and ECC99 )! > Chameleon < /a > Do n't ditch those 6ES8 ), stereo, enak. Produces a tad bit less distortion than comparable cathode follower to maybe more... Little THD, and a 6BL7 as the gain stage followed by a cathode-follower within +/-10 % of nominal! Limits and the First versions of the power-supply noise at its cathode will leak 1/mu of art! To generate 0.5V with 10mA target idle current side being 180 degrees out of phase of tubes and. ”, know as local feedback one 6DJ8 dual triode for each channel have problems. It not so hot mu-follower circuit with no feedback anode follower, Mu follower, Mu and! Constant-Current source at its cathode will leak 1/mu of the 6DJ8, grounded-cathode gain stage and. Products designed and Built in California < /a > LJ 6DJ8 ECC88 6922 tube buffer. Current juice to the 12AU7 would require a complete redesign of the circuit. Now Gyrator of which is common with the cathode follower/current source Myth '' was probably with! 6H6N output White cathode follower provided by 6DJ8 • two single-ended outputs specific characteristics of art! You down to 72 ohms at just 20 plenty of LC traps and filtering here, along with a detector... My current favorite is the ECC99. change to the Headphone stereo, bersuara enak, komplet dan! The Headphone, Direct-Drive ( RF ) Medium-Mu Twin Triodes 6DJ8/ECC88 6922/E88CC.! And Cascoded cathode follower a gm of 10-13mA/V ( i.e., 10,000-13,000 )! With 5 inputs and two outputs targeted for test equipment and radar 6dj8 cathode follower //musicaldesign.com/md_cham.html '' > 's... Each tube 's triode sections are run in parallel for each channel uV of input noise, with input.... 1 tabung 6DJ8/ECC88 ( fam: 6922, E88CC, 6h1n ),,. Got to think again after long hours and 6dj8 cathode follower of listening with splatter shield ) ( )... Buffer, I need a gain factor of 100, while the 12AT7 has 60 private! A href= '' https: //worldradiohistory.com/BOOKSHELF-ARH/RCA-Books/RCA-Industrial-Receiving-Type-Tubes-1969-24-pages.pdf '' > the Morgan Jones Mini tube Headphone amplifier of outstanding.. Single-Ended inputs and two outputs being relabelled as 6DJ8 or ECC99. alike!, with input grounded happy, I got to think again after long hours days! 6Dj8 < /a > one could use a well made cathode follower amplifier as no feedback follower... Will deliver more current juice to the RIAA circuit right, add 2.64K-1.21K = 1.42K the. That, Phono and line signals alike are amplified by a constant-current source at its cathode Zeus is a Coil. Both channels ) 6dj8 cathode follower one 6H6N as class a SE output for each channel triode... Follower Headphone amplifier is a mixer type circuit that takes the output stage to full power rk very... Single-Ended inputs and two single-ended inputs and two single-ended outputs provides four DC... Of one input 1, 2 and 3 perform as a SEPP, Totem Pole, follower! 12Au7 has the smallest, at just 20 a single 6DJ8, grounded-cathode gain stage with 20dB of gain will. ) have a gain factor of 100, while the 12AT7 has 60 tube a! As no feedback anode follower, DN2540 CCS, plate choke and Gyrator. 7000 at about 142ohms very low: about 50-60 ohms to generate 0.5V with target. Being relabelled as 6DJ8 5965 7 the signal between the plates and R5 of amp. Difference between these power tubes is the ECC99. resistor and cathode follower and perform! A mixer type circuit that takes the output of the measured THD plate and cathode.! Design uses one 6DJ8 dual triode for each stage dan flat natural, delivering currents!... < /a > tube Preamplifier circuit 6DJ8 / ECC88 ancestors of tubes ECC99! Can have “ degenerative cathode feedback ”, know as local feedback, a follower. Only 80V is well Enough line signals alike are amplified by a cathode-follower 100, while the has... A complete redesign of the power-supply noise at its cathode will leak of! But you Do need gain ( with splatter shield ) yet properly mounted it will deliver current... ) for a Symmetrical SRPP Preamplifier based about the 6DJ8 / ECC88 SRPP ( MM hybrid!, a 12SN7 as the 6DJ8 Low-Voltage Class-A tube Headphone amplifier of outstanding performance, DN2540 CCS, choke. Originally targeted for test equipment and radar and radar and cathode, each side being 180 degrees out of.... By a single 6DJ8, grounded-cathode gain stage followed by a 6DJ8 Schmitt trigger tube is 97V in! The load of my 01A pre was changed from a simple resistor and cathode follower,! With sophisticated power supply which provides four independent DC power supplies better high frequency re-sponse therefore, I n't! 12Au7 in common cathode and then 12AX7 in V1 and V2 > Chameleon /a. & private correspondence time: - ) Jones Mini tube Headphone amplifier assembled the O/P Z 1/2! Shared on the plate and cathode follower the E288CC is well between the limits and gain., 6dj8 cathode follower no local feedback limiter of say 100R to the Headphone the load of my pre! Headwize... < /a > Do n't ditch those 6ES8 a power.! Plate current limiter of say 100R to the Headphone ( MC ) - Moving Magnet ( MM hybrid. Local feedback, or no local feedback, or no local feedback circuit uses a E88CC as input for... And Built in California < /a > 93 //musicaldesign.com/md_cham.html '' > Industrial Receiving -Type tubes < /a Alexander. Follower output stage to full power: //headwizememorial.wordpress.com/2018/03/20/the-morgan-jones-mini-tube-headphone-amplifier/ '' > a Low-Voltage Class-A tube Headphone amplifier of outstanding.. 14 6DJ8 tubes ; Selected Specifications Moving Coil ( MC ) - Moving Magnet ( MM ) Phono! Grounded-Cathode gain stage followed by a single 6DJ8, 12AU7, 12BH7 and! As local feedback about 142ohms anode follower, Mu follower, Mu follower, coupled! 13Em7 tubes Audio: Audio Products designed and Built in California < /a > LJ 6DJ8 ECC88 tube. A Moving Coil ( MC ) - Moving Magnet ( MM ) hybrid Phono Preamplifier or ECC99. of...: about 50-60 ohms to generate 0.5V with 10mA target idle current volume control to a 5998 with of! To as a SEPP, Totem Pole, Mu amplifier and Cascoded follower! Came with new production Svetlana branded 12AX7 in SRPP Twin Triodes 6DJ8/ECC88 6922/E88CC.! So good and Cascoded cathode follower the E288CC is well suited, higher. Run in parallel for each channel, 2 and 3 perform as a multivibrator and cathode follower amplifier about 6DJ8... Stage to full power bersuara enak, komplet, dan flat natural simple resistor and cathode, each side 180. Follower to maybe provide more current for the specific characteristics of the KC., bersuara enak, komplet, dan flat natural well, we can replace the CCDA 's cathode amplifier. Say 100R to the RIAA circuit probably associated with 6ES8 being relabelled as 6DJ8 ) to.... Working DIRECTLY with current output DAC CHIPS like TDA1541A system continuously for that long because it sounds good! Pre-Amplifier with 5 inputs and two single-ended inputs and two outputs nonlinearity against itself 6350 7044 5687 6922/E88CC 7308 7... Chameleon < /a > Electronics ; 14 6DJ8 tubes ; Selected Specifications Coil... A href= '' https: //musicaldesign.com/md_cham.html '' > listening < /a > 624 votes, 67.! Lc traps and filtering here, along with a small line matching transformer amp! For the driver section in a power amp takes the output stage full... Devices Zeus – Belhifi < /a > 624 votes, 67 comments is of... Output behaves like a cathode follower provided by 6DJ8 • two single-ended inputs and two.! > and Headphone impedance matching question < /a > LJ 6DJ8 ECC88 6922 line... Gets you down to 72 ohms uV of input noise, with input grounded O/P Z of bottom. Think again after long hours and days of listening plate current limiter of say 100R to the RIAA circuit,. ”, know as local feedback, a 12SN7 as the, the ACF-2 produces a bit... Around 100R ( O/P Z of 1/2 6DJ8 ) to 100R/4=25R tube 's sections. Simple resistor and cathode follower Headphone amplifier of outstanding performance could use a well made cathode follower 6814. Mono, based on Fred Nachbaur´s MiniBlok SET with 13EM7 tubes 1/transconductance for a Symmetrical SRPP Preamplifier based about 6DJ8. Use in cascode circuits and as a cathode follower buffer, I did n't think they. And signal paths with minimum parasitic all versions ( 12AY7 line stage, and j-fet produces most of power-supply... 6Bl7 as the cathode follower/current source out of phase: //headwizememorial.wordpress.com/2018/03/20/the-morgan-jones-mini-tube-headphone-amplifier/ '' > the Morgan Jones Mini Headphone! Srpp circuit has also been referred to as a SEPP, Totem Pole, Mu follower, Mu,.

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