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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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This is by Hans Beijner. His site is: http://www.tubetvr.com/In 1976 a Mig 25 fighter jet landed in Hokkaido in Japan, it was flown by a soviet military pilot that wanted to defect to the west. This was a real field day for western miltary peopl...
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[quote user="N-set"]BTW, how stable 6E5P is? I'm asking as I was contemplating biasing the output by the voltage drop on 6E5P's plate choke (DCR is say around 1k),with only some minimal autobias on the output. The drawback is that any drift in th...
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[quote user="Romy the Cat"]Are any of those new tubes besides the Chinese tubes are single plated?[/quote]I believe they are all single plated.
[quote user="Romy the Cat"]I have bought some very nice 2A3 and 6A3 double plated from 1942 and 1944 an...
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[quote user="Romy the Cat"]I was listing it and I did not really like what I heard. It was all together juts some kind of “Ordinary Sound”. I recognize that I say “I do not like sound” but I can’t say anything more spastic. All of the sound that I ge...
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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="drdna"]KR Enterprises 2A3. Minimal mechanical resonance. Solidly built. Very good, even reproduction of music across the frequency range. There is minimal harmonic distortion. The HF, midrange, and LF are correct. The reproduction of the...
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where the pins go through the tube glassThanks for the tips, Romy. But I am not sure from your response if you now get that it IS the glass at the bottom of the tubes themselves that cracked. The cracks did not "run" up/break th...
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Very good, floobydust. They are exactly my thoughts about the “period tubes” as well. In addition to that I think that factor that call “Holly Ignorance” did take place with some vintage tubes. They might not have too high demands for the quality of ...
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Having listened for a while with the tubes, I have come to some conclusions. The three tubes I have seriously listened to are: Kron, Sophia, and Emission Labs. All the tubes are much better than any other modern 2A3 tubes I have tried. I felt my in...
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[quote user="floobydust"] One of the reasons I no longer use a tube tester. They make a measurement at a specific target operating point(s). You don't really know what it is, so what are the chances they will be close to your actual circuit opera...
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In the thread GM70 vs. 6C33C two year back I have written that the only tube that I would like to trey in Milq besides 6C33C would be YO-186.
I am not sure that it might be a right direction or even interesting direction but I picked yesterday a par...
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[quote user="Thomas Mayer"] I never had a lot of trouble with high transconductance tubes. I use the EC8020 a lot. [/quote]
Stefano, you might look into this EC8020. I never seen it but just looked into the datasheet and it looks very interest...
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Yes, it was kind of interesting. The Tentlabs site does not have anymore those popups (and my machines are environmentally clean). I was so surprised when I sow it that I even went to their web site from my “absolutely clean “server that never ever g...
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[quote user="Romy the Cat"]Because GM70 can work in A2 class the ML3 has a very powerful high current-capable second stage (I do not know it they are 4 parallel 6H30 of some kind of composite follower) to be able to handle the GM70’s grid current.[/q...
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[quote user="Romy the Cat"]
I always was kind of afraid of it. Any single zillion years tube I see is “NOS in box”, “measured as new” or “never work”. So, I wonder where those uses up old tubes are gone? Do people trash them or juts sell them “as n...
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Would anybody recognize who manufactured those 0A2 regulators?
Since I use them quite aggressively, I picked at MIT's fleamarket a few dozens of them dirt-cheap. The tube looked suspensions. Then marked as Amperex, Made in England and National Elect...
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Adrian, Romy, (Dima), First, I most certainly agree that the textbook operating point for the 2A3 is not optimal and can be improved on, hence my own design from a few years ago. If you are sticking with a 2.5K load, you will simply not ge...
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Actually, Romy, it is simply that the tubes that came with the amp were not "good" in the sense that they were not doing their jobs. Period. You may remember the pulses through the speakers and how new input tubes cured the problem? ...
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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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[quote user="drdna"] So you do not recommend the stock tubes? Is it a specific change you recommend?[/quote]
Better tubes will certainly give you better sound, in many cases more sophisticated sound. I do not know what tubes EAR uses as stock tubes ...
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I actually read the review carefully.
My initials sentiments were very accurate. Knowing the Vladimir’s reaction to those thighs I might presume that he also feels that this level of “intelligent writing about audio” is no more intellectu...
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Adrian, Romy, et al, Okay, I don't take any of it as an attack... so none of that bothers me.... I'm fine with it... again, it's a view on what you heard based on your test scenario, nothing more and I certainly welcome the review. Now tha...
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Okay, I think I understand.... and thanks for the link on the YO-186... if I can ever locate some of these I'll be sure to grab some (hmmm, a trip to Russia perhaps). As tubes get very hot internally, there were some procedures for trying to eliminat...
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[quote user="Romy the Cat"]Stonily they are very similar in my view with a very slight advantage of 6E6P in delicacy and softness. I do not know what you mean “respond differently regarding vibration.”[/quote]As I had been looking at all these tubes...
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[quote user="Romy the Cat"]I play a lot of LP recently and last night I noted that sound was quite bad. It was like a bad electricity day only atop of it sound has some kind of odd digitalization atop of everything. Of course I was blaming the PurePo...
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The basically the same tubes. The 6E5P has own unit pins layout with heaters connected across the tube – very moronic in my view and it does not allow twisting the AC filament wires to the very end. The 6E6P has a common pins layout that most of west...
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[quote user="Romy the Cat"]Anyhow, the problem is not with Ken Chait or Lamm owners but in the totally foolish expectations that 6C33C might be matched. Well, if you do burn the 6C33C for 50-60hours and do match it by gain, by bias and by currant the...
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An Audio Amplifier Design Philosophy
By David Berning ( Courtesy Meta-Gizmo.com )
I became interested in audio at a very young age because I liked music, but was too uncoordinated to be able to p...
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To crack the small-pin tubes by jerking them in tube-sockets? I do not believe in it but you are at your full right to feel that you did it. If you cracked 6AK5 then it will very fast (a few hours) loose the getter on the top of the tube (dark-s...
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Since I painted myself into a corner with only one tonearm and one cartridge, and my one cartridge has gone to the Ortofon Spa in DK, I am sans phono until my cartridge returns. This means I have too much time to think about a phono stage, as oppose...
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