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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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I do not remember which one I used. I remember that I was deciding if to mount them on chassis vs. to have a small board with tube sockets under the chassis and bring the tubes through the chassis. The board mounting is better as it decuples the tube...
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Romy, I have had good experiences with the Shuguang 2A3C. There are plenty of comments in the Sewer about this tube. They cost about $80/pair and seem quite stable so they are a good choice if you leave your amps on a lot. superTnT.com is out of t...
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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 new”. As many old tubes I ever ...
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[quote user="Romy the Cat"]Is something brewing in the former Czechoslovakia? The whole country is the size of a half of New Jersey but they have 3 manufactures that do “objectionable” tube today. Is it the same rebranded group of people behind of al...
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I did not play a lot with those DHT tubes but if there is any debate between contemporary production and 50 years old production than I would vote for older production. It is unquestionably that today the “construction” is way better and some of olde...
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While I would agree that modern construction should be much more robust than that of 5-6 decades ago, actual machining and manufacturing costs today are significantly higher than they were back then and there is much less of it going on. Look a...
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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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No, I wouldn't dream of driving my SL600s with the Berning. My understanding is that with their low sensitivity and lowish impedance, the SL600s need current. The Rotel is capable of delivering 150A into 0.1R (for short 10 microsec bursts), and seems...
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First of all, this not an attack on NOS tubes and it is all meant to be just sort of fun and educational. I happened to have all these 2A3 tubes side by side for comparison, so why not? I also have done the same thing with other tube types like 6SN...
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First of all, this not an attack on NOS tubes and it is all meant to be just sort of fun and educational. I happened to have all these 2A3 tubes side by side for comparison, so why not? I also have done the same thing with other tube types like 6SN...
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I kind of in a way used these techniques with my playback during past years. When I used 3-channel Melquiades and had a dedicated ½ 6C33C for MF driver of Macondo I usually tended drive my rights MF channel at slightly higher current then left c...
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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 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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Romy, et al, I got rid of my tube tester a few decades ago... yet I still need to match sets of tubes for equipment. When you consider many SE designs with no feedback loops, you need to match "sets" of tubes to get matched performance between ampli...
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Nope, the Russian tubes generally much, in fact much worse than western equivalents. There were however some exceptions. Those options were due to various reasons. The tubes like GM70, YO186, 1P24B, 6E5P, 6N30P, BO188, GM57, UB180, 6C33C, 6N6P, M...
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I got home today, power up the payback and played some bootlegs of Australian festivals that Kostas Metaxas sent me another day. I paid attention that the sound was strange it was too hard atop. That was something new. I put in my player the CDs...
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[quote user="zztop7"]Edit: I think it would be better if I said Solid Plated vs. Perforated Plate Output Tubes. Perforated being the winner with 12 hours of listening - very easy.Best to you, zz.[/quote] Thanks for your feedback... But, as Romy s...
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Well, if cause I would not keep the DHT tube with plastic bottom in sauna. Even though I did, purl for run, loaded 4 boxes of 6C33C under the lower sauna beach, still the subject tubes in sauna is rather a metaphorical concept for me then the true ne...
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Romy:I would suggest not to store tubes under the bench in an actively used sauna. While the temperature alone will not affect them, the combination of heat and saturated humidity may lead to corrosion of the pins. Also many bottles are held to bas...
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I do not have a lot of equipment that uses vacuum tubes I have a phonostage and power amp that are tube based. The phonostage used 12AX7 that in there from 1999 and I think they will survive me. The power amp use gas tube 0A2, the output triodes 6C33...
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Rowuk, you triggered a thought with your words: "boot cycle" "warmup" "change to operational mode". This question is to all the people that have this knowledge >>> For the benefit of the tubes, and other parts; is it better to have NO si...
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This post is a derivation from the following post:
http://www.romythecat.com/Forums/ShowPost.aspx?postID=11797#11797
What is interesting is that I have a few the same types of shields for small 7 pin gas tubes and I have tried tho...
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[quote user="Romy the Cat"]buy a box of Epoisses Berthaut cheese. Just one sniff of this French wonder will give you an instant reference about the YO186 sound.[/quote]La fromage de les Epoisses du Borgogne, c'est ma favorite. Bad news since the YO1...
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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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http://www.pmillett.com/pentodes.htmhttp://www.pmillett.com/images/pentodes.PDF...
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Hello Romy,
Quite clearly, a high Gm device will have a higher voltage gain than a lower Gm (for pentodes, gain is Gm*Rload if single ended) and this is something we are after in a MC stage. Noise performance is crucial and below I am analyzing a ...
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A local construction guy named Michael Lally came up with some controversial theories in the 1980s about how the Egyptians moved large stones large distances and up the pyramids; rumor has it his simple and practical theories really bothered "studied...
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The ECL82 = 6BM8 was used a lot in low-end amps, both push-pull and single-ended. Actually, according to your radio's schematic to which you posted a link, they are not being used "one per channel," rather it is a mono radio (nothing wrong with that...
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[quote user="Romy the Cat"]I usually hesitant to give any recommendations for “improvement” if a request does not contain any defined and specific complain about the current results.[/quote]Naturally, this makes sense. My question was actually specif...
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[quote user="Paul S"] http://app.audiogon.com/listings/omnigon-full-function-tube-preamplifier-phonostageLooks like a serious effort that has been kicking around for a while.What tubes are used? Are they twin triode, like 12AX7 or - more likely - 692...
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