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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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[quote user="KOTriode"]The preamp has the classic tube regulated power supply using 5R4, 6AS7, 6SJ7. It is transformer coupled output and has no capacitor in the signal chain, the gain is about 8db, so it is not a buffer. For convenience, it does...
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(Romy feel free to move this post)[quote user="Paul S"]N-set, I understand you do not mean to hijack the thread with the Axiom, so I actually tried to make generic and/or thread-related observations. I don't know the 6E5P, but generic issues with sp...
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Thank you Romy! Actually I've realized that when I wrote it I rather ment dynamical stability then frying the outputs. But in proper PP the even order harmonics are strongly surpressed, sothere should be no or very little change of the output OP due ...
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Looks like another case where clean AC wall power is demanded and supposed. Since they use triode output, I wonder if the "gain path" of the pentode is "wired triode", as well, or if they just want the extra gain to scrub in the upcoming RIAA; or ma...
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Romy, that 6C33c is also only running one triode...you also have the option to wire up the other filament to increase power if required....
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The sockets for 6c33 should be here in a few days. Meanwhile, I fired up the 6ep5s. I labeled them ABC. The B sample ('83) with gold wire has a short or something. The other two look fine A ('63) has a little more output than ...
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actually I agree with Romy, to a degree.... If the amplifier is a push pull device, using my output and input splitter devices of course, then an interstage transformer is a much better choice than rc coupling. Using transformers designed to the crit...
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I would agree that the Lowther is not hard to beat but the question is where and in whose mind does this competition exist? Is the Lowther, Manger, or other full range single driver in competition with different multi-driver approaches, other single ...
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Hi Romy,
I did the review on the AcousticPlan amp, called the "Santor". It is indeed a two-stage amp using 4 6922 tubes in parallel to drive a high Bias Mosfet output stage (it is class A to approximately 15 watts and runs very hot). It ...
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Paul, don't get me wrong--normally I'm not choosing a tube by the power, but this situation is somehow special.There are very few tubes which have the right electrical parameters (gm, mu, power, etc) to start with. In thesmall tubes word one can glaz...
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[quote user="Romy the Cat"] ... did anyone have an OK sounding amp with ½ 6C33C ...[/quote]The 6C33C has only one pin that connected to both plates. Since I use ½ of 6C33C in my MF and UpperBass channels then I theoretically burn just a hal...
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[quote user="Romy the Cat"]Brian, and how do you find your MOSFET behaves compare the 12AX7-based cathode follower?[/quote]Romy, I have yet to try. Only got them on recommendation very recently. They're cheap enough to try in a B9A plug-in without al...
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The preamp has the classic tube regulated power supply using 5R4, 6AS7, 6SJ7. It is transformer coupled output and has no capacitor in the signal chain, the gain is about 8db, so it is not a buffer. For convenience, it does has a remote control. It i...
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N-set, I understand you do not mean to hijack the thread with the Axiom, so I actually tried to make generic and/or thread-related observations. I don't know the 6E5P, but generic issues with specific DC tank circuits and driver and output tube stab...
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[quote user="vuki"]Anyway, my plan was to make powerful triode NFBless amplifier for relatively small money. I'm really satisfied with what I did. Maybe I should have done GM70 SE, but what would be my next project then?[/quote] The GM70 is a bitch a...
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A few weeks back as I got the Schaub & Lorenz I pulled the pubes out and measured them on my tester. The tubes were very week and the output tubes were semi-dead. The Schaub uses a pair of ECL82 tube in output stage. The ECL82 are triode-pentode...
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[quote user="hagtech"]As usual, they leave out the VacuTrace, by far the best modern day tube tester. [/quote]Interesting, Jim.
I was not in the market for tube tester but I looking at your tracer I fugue out that I might sell a few my chea...
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[quote user="JJ Triode"]Romy, take a look at EML 30A and its cousins:
http://www.emissionlabs.com/datasheets/EML20B.htm [/quote]
Yep, thanks, JJ. Still the EML 30A has a lot of gain but it has also very high plate impedance as well. As much gain w...
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To get 17W per KT88 in SE, I think it must be pentode or ultralinear operation. Triode-connected in A1, I think a KT88 can only make 10-11W max (plated dissipation limit is 44W.) So it probably uses feedback, but that is still not automatically a b...
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Paul, unfortunately this charge/discharge effect applies to ALL reactive components. Not onlyto the interstage but also to the amp-speaker coupling.2Hz is easy for an RC coupling, now go ahead and try to design a full-range OPT with such a low -3dB!...
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http://www.theabsolutesound.com/articles/lamm-ml22-single-ended-triode-amplifier
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Paul, you wrote:the best bass I have heard came from triode PP ampsWhich PP triode amps, using which output tubes?the little 2A3s have wonderful bass (as far as it goes...)Which 2A3s? The Wright 3.5s, other single-ended, or PP?I am mostly using PP a...
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[quote user="JJ Triode"]I'm listening now and the sound is quite good in my opinion. Ma is plying from WGBH's studio in Boston so I presume they are carrying the stream as well. He is on for one more hour.[/quote] I did not get the feeling that he wa...
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Hi,[quote user="morricab"]As to the best transformers souding more transparent than the best resistors, I'll believe it when I (don't?) hear it. You claim to have heard this but I most certainly haven't. [/quote] Well, the claim is no...
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I had a little flash a few days ago thinking about potential.I've been following more high tech gadgets lately, things like the iPhone. And pondering ideal audio setups from the erspective of design and ergonomics. This had me thinking about solidsta...
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I never knew that Quicksilver does 6C33C, they never did when I was still monitoring what companies do. Their Triode Amp was, if I remember correctly, a base PP unit with a pair triode strapped 6L6/KT-88 tubes, where people were trying to put-in many...
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I'd rather look for the FM magic, which I love and adore, in the modulation/demodulation process than physical field propagation. Perhaps FM process creates a stable, ~1/n harmonic spectrum like a triode? ...
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Yeah, I'm a little slow here. Had very busy week pumping out machines. I do have two custom tube adapter cards built. One traces two separate 6e5p at same time (great for comparing). The other is for 6c33. So it's just a...
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[quote]BTW, Jim, when will we see your version of amp with 6E5P driver? :-)[/quote]Well, I have to admit it makes a beautiful triode. Wonderful linearity, low output impedance, and super-high gm. Looks a lot like the 6H30, which was my dr...
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I think 99% of audio designers try to solve problems on paper (objective model).Mr.weiss try to loss less when design a volume control but non of them pay attention to musicality of sound.market do not like to say what new approach loose and they jus...
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