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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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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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Yes, there are some specific differences between how various manufacturers burned in their tubes and the initial firing of the tube and flashing the getter, etc. There is an interesting video of the old Blackburn Mullard plant here:http://www.techtub...
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[quote user="Romy the Cat"]Can you provide me with more adjectives and more descriptions what exactly you recognize was differently-wrong in the sound of playback with use of non-paired tubes?[/quote]The results I found were similar to what you had f...
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That sucks. I use to have a box of perhaps a dozen of YO186 but I did not see it for a while, pretty much from the time I moved to new house. I was listening today some of my “critical” reference stuff and concluded with very high certainty that my M...
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KOTriode, We had this conversation before. It is not what I regularly experience. The 20% of faulty tubes is astonishingly high number for this tube and if he has this ratio and did not change his suppliers then he must be crazy. On the good side you...
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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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Totally disappointed today, while I was listening to music, the left channel make a small pop and quit. The bias meter showed about 25ma bias instead of 200ma. Test the tube on bench showed that the tube current stay about 25-50ma max. This tube is g...
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[quote user="Romy the Cat"][quote user="drdna"]As I had been looking at all these tubes I began to also inspect their interior construction. This will amuse you: one thing I would do is to hold the tube right up to my ear so the glass would be touchi...
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Didn't you first become aware of MF "problems" when you got everything else working better via the PP2000, and the MF wound up dropping back to weak sister status with respect to system-wide PP2000 benefits?But how often is a "serious" (and ever-evol...
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[quote user="drdna"]As I had been looking at all these tubes I began to also inspect their interior construction. This will amuse you: one thing I would do is to hold the tube right up to my ear so the glass would be touching and thus mostly damped. ...
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If I were more scientific I suppose I would do a better job with controlling other factors involved, but in this case the tubes are cheap, so I just swapped them out. Sound had gotten "disorganized" and bass was weaker, both in a way ...
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Brad, I heard a KR years ago, only remember it was not the typical "no-feedback sound", which I think of as clear but flaccid and no push. I agree that "feedback" can eventually ruin bass, and more, as I mentioned earlier in connectio...
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"I would not trust any seller who clamed that they tested them." -- R.B.How annoying that your words were prophetic, Romy. The 6N6P tubes just arrived from St. Petersberg in a plastic mailing bag rather than a box, and one tube...
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[quote user="nl"] I don't know. Some people like …. supposedly mixing the appealing qualities of each [/quote] Well, I understated all of it but my mind works diffidently in audio. I do not feel that going for some kind of “magic” vintage tubes is a ...
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[quote user="N-set"]Looks like one more argument for the thesis that caps ssuck!Sorry for a naphtalene-smelling idea, but how about VR tubes *here*? It's an light-weight MF channel.The current variation VR's will see should be very small so perhapsch...
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"... and I do not know if 3A/167M is better than anything else and I do not see why the metal socket is necessarily better then plastic – the socket is not the part of the tube."As you know, the 437A is like an on-steroids ECC83, ALL glass built, no ...
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I know – it idiotic even for my site but it us what it is. I do not think that I can generalize my observations as I have not a lot of experience with DHT tubes but one thing that I have been observing for the last week is really arouse my curios...
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I closed up the amps and moved it to the default operation position, right along with it all Dominus cables and so on. I played just mono music and was very interesting where I will find myself with this amp Sound. The right channel still was s...
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[quote user="DHT4ME"] This is true. It comes down to thermal cycling. I love the #26 tube but it is real hard to get quiet. It has a 1.5v 1a filiament. The heavy draw causes thermal cycling which is very hard to null out. There is also more rati...
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[quote user="Romy the Cat"] I figure out that it is time and put some acoustic treatment on the walls and at some spot of ceiling. The 2” pyramids in white, 24” by 24” look very nice; in fact they almost work like abstract yuppie-ornamentation po...
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The best of the Herbie's bunch to date, in my system, have been the older PEEK, with black/dark gray "Cs" that are similar to Teflon. I don't know if his source dried up, or the mimimum order got prohibitive or just too expensive, or what....
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That is kind of mysteries to me and very none expected. From the people who use DHT I heard many stories that 2.5V filaments driven by AC are less noisy then 5V or 7.5V. That is kind of self-explanatory as with higher AC voltage the more noise. S...
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I assembled SUN 2A3 amp for my friend and found it to be quality kit and very easy assemble. Kit was old .I think late 90's so maybe quality deteriorated since then. I have variety of 300b Czech tubes and (Eml 300b , KR 300BLX 842VHD ) bought t...
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As I've mentioned elsewhere before, over the years I've gotten about 25% clinkers, among all tubes, from all sources, including "specially selected, graded and matched" tubes. Also, I have lived with the 6C33C enough to say it "drifts" in use, and i...
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[quote user="Romy the Cat"]I very much like the idea as it will kill all HF reflection and very dramatically randomize MF. Pussy.[/quote]before doing anything I say you can use a spray made for making dried plant steady and stop them from exploding t...
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[quote user="Romy the Cat"]Here I share some thoughts about what you have shown. I will
share only critical and warning thoughts not because I have nothing but critiques.
All nessesary compliments for your planning come as a default and I do not
t...
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Anthony, irrespectively of all the extreme acrobatics you are doing with the inner damping and the structural isolation, sound wave hitting your tubescan multiply all your work by zero. As simple as that. Big tubes = big inner structure structure = l...
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I have no idea where this saga with REL leads me. Even though I do have substantial sonic improvement over the original REL version I still do not know if I like this tuner all together. The 50 years all tube tuner with 17 tubes is very freaky thing....
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[quote user="Romy the Cat"]That is a good question and I asked myself it numerous times. My current standing is the benefits are purely intellectual as I am not able to observe the applied benefits. [/quote] Recently I got eventually the box (th...
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Bonkers says thanks for the compliments he is always been interested in audio pursuits. Been a while since he's had anything interesting to rub against. I wasnt paying enough attention. The gas tubes never made me feel the same way as Melqui...
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