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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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I totally am a believer that the construction of a tube determines how it will sound. This makes perfect sense when you consider the tube is relies on the changing flux of electrons in a vacuum. It is easier at least for me to visualize this as a ph...
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Hi Romy, KR audio is making high power SET and parallel SET amps using tubes designed by them specifically for low frequency amplification (read as in not radio frequencies). They are getting the power with lower voltages and higher currents th...
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[quote user="Paul S"]While you are merely being empirical, there are actually plenty of devices that aim to "benefit" the end sound of SS gain by using tubes to "condition" the signal from DACs, etc. Also, there are plenty of commercial widgets ...
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[quote user="hagtech"]Romy, you were right. I just got in another pair of 7788 from eBay. This time, one tube has a little bit of microphony, not bad, really. The other was dead quiet! No ping at all. Very impressive, th...
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I suppose this further erodes my "credibility" regarding the "tube sockets" hysteria, but it is what it is, so here goes:Today I finally had the right combination of alone time and motivation (not to mention great electricity) and I got around to swa...
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Okay so I got the NOS Sylvania "Spring Top" dual filament 2A3 tubes and have been listening to them for a while, now I am ready to make a report on the tube.
The tube is well built and structurally sound. Tapping gives a very small "tabla" sound ...
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Why do we even bother with tubes for low levels? Of tubes generally, I have used 6SN7s, 2A3s and EL34s with no known-to-me problems, but lots of various noise trouble with certain tubes, including 6DJ8 family, KT88s, and on and o...
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Wow! I did not realized that almost 4 months have passed since I wrote last.
Quite a few things have happened the last 4 months that I have played with the 6C33Camp/preamp combo. I have tried at least 3 different vendors on the Ulyanovsk type, the ...
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[quote user="drdna"] I built this amplifier more than ten years ago, before these other tube companies were in business. I know the Vaic tubes, which the EL tubes are related to. However, I have not tried either tube. Maybe it is a good idea (and I c...
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the less you know about...So, how do we go about screening tubes for audio, particularly audio signal tubes? The only person I can think of who claims to have found a specific testing paramerer for this is Roger Modjeski, of Music Reference and...
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I just discovered it, somebody pointed it out in another thread, and it is so funny.
I am commonly known for hating Russian tubes. I mean there were very few tubes that were designed in Russia and most of the Russian tubes t tubes are juts rep...
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Adrian, I wonder how you wound up with the never-mentioned FET 10? FWIW, it was one of the better all around phono stages I've heard, and - not that it matters - I prefer it to the EAR 834 I heard. Is this another case wher...
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Romy,
I have good confidence that it was the tubes and not the circuit. I have checked the cathode driver that bias the 6C33C and there was not any problem. Sure if the cathode bias failed, the 6C33C current will shoot way up and burned up the fuse...
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[quote user="Romy the Cat"][quote user="drdna"]However, there is no comparison to the expensive tubes from Kron, Sophia, and Emission Labs. These are all in a separate category. These produce a very different sound. It is like this: on the old black ...
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[quote user="Romy the Cat"]
For instance the 2A3 has no tungsten cathodes and therefore its cathode might be “poisoned” in time if it was not properly pre-burned and some other methods were not taken care. Those methods are expensive but they ...
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I am NOT going to buy a new set of KR 2A3's just to compare to my "vintage" ones, especially considering the price has gone up to $800 a pair!
However, a NOS pair of Sylvania "spring top" 2A3 tubes is on the way to me. So I will have some things ...
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My experience has been that tubes that run quiet and quiet down quickly and "properly" when tapped are almost always quiet with respect to self-noise and/or microphonics in use, apart from low level phono use. And most of my tubes tha...
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[quote user="Paul S"] I have been surprised that you have not already pursued the Zarathustra for your multi-driver, sealed LF. From your early descriptions of both, this seemed like a natural pairing and the most likely way to go, to keep the ...
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In the end of the 40’s IBM made the Selective Sequence Electronic Calculator which contained 12,500 vacuum tubes (25L6, 6J6, 6211) that could multiply two 10-digit numbers 40 times a second. The first versions of ENIAC used 19,000 vacuum tubes. The U...
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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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This weekend I will be finishing the whole Milq modefication, putting it back to the full-time service and this Sunday the James Levine’s live-to-tape broadcast of “Simon Boccanegra” is was planning to listen via the reincarnated Macondo.
Doin...
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Anyone ever tried the "pinless" tubes that have long-ish wires in place of the usual pins?A Moscovite I ran across has Russian mil-spec 6AK5 "equivalents" that have pinched glass and the wires instead of pins. Oddly, Lamm lists the type numerically ...
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Just a lazy-ass type question, really, motivated by nothing more than curiosity.Today, since it's "time to change the V2", and also out of curiosity, I will break in some "vintage" 6C33Cs.To tell the truth, any logistical "issues" with ML2s actually ...
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Thanks, I have seen those sockets they might be fine but they do not decupling from chasses and they are not soft. I was thinking about something that has spring effect. Pearls sockets for instance has a soft rubber decupling between base and the pin...
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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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Actually I was wondering what the hell you were talking about what you were bitching that the ML2 socket can not handle 6N6P first. Ether you changed over 10.000 tubes in there or something else was wrong because the ML2 sockets are fine (except the ...
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[quote user="dazzdax"] Sakuma's idiosyncratic and esoteric way of thinking (he believes for example that tubes have a "soul") is not to everyone's liking. He is projecting his mind into a sort of tone control. At least for him this tone control bring...
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[quote user="hagtech"]Yes, it is an E55L. I wonder how stable it is. Interesting to me how many of these "uber-tubes" are designed for RF operation. Should make a wonderful oscillator. [/quote]
Go figure not stable are they. ...
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Rooting around for manufacturers' operating curve/info on 6922s I came across a short paper I got years ago from electronics genius Roger A. Modjeski. In a nutshell, RM talked about internal variables in tubes that affect their electrical charac...
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[quote user="AlexBerger"]Hello Romy,
What brand of 0A2 do you use in your phonostage?I used RCA, but after 1.5 years of work it began to spark when phonostage is switched on.I tried Siemens, Mazda and now Sylvania 0A2.Siemens has "disco sound"...
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