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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 know, you have to decide to yourself what kind tubes and the most important HOW you would like to test them. For different tubes, differently used the different things are important. I had a few testers and all of them were OK but all ...
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Jim, I have sent you the tubes – it might be an interesting journey.
I send you:
1) 6C33C that was working with both cathodes approximately a year. It is not dead year but it is deep into retirement age. Run it at 220V and 200-250mA full-tube,...
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Little I know about tube testing.Here is a link to one that can do a test series on tubes at rated voltages, including 6C33 (with extra-cost adaptor, of course), and it will compare sections at once: http://www.amplitrex.com/index.htmlSucc...
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You're welcome, Romy.I have still not found the original Russian "number" for those ones, but if ever I will, I'll forward you the info.For what purpose are you using them at 22mA ?...
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Hi Jack ,Thank you for your very educational info ! It looks like you are right , and your tubes are rebranded SG13P .... Maybe a big stock of those tubes were exported , and you know them better than we do :-)And another question . You wrote :...
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Hi Romy,I am very interested in what you have found out about the 6C33C tube lifetime because I am using a pair of Silvaweld OTL tube reference (their name for them not mine) amps that use 4 x 6C33C-b tubes per monoblock (so a total of 8). Thes...
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No question in my mind that the tubes themselves contribute to the sound we get from tube-based systems. Funny how I go to such lengths to get "quiet" tubes and use dampers even as I realize that even the quietest tubes are doing their bit to/f...
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Is there any technical reason that you use a 400V transformer to feed the driver tube?The plate voltage on 6E5P is only +200V. Therefore from my point of view, a 220-240V transformer would be enough....
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Dear Romy,it had been a while before I hv return to your goodself and here.The Meliq had been built according to your circuit. However, after a few days' breaking in period. The VR2 have issue and causing sudden increase of current... I think it migh...
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[quote user="Paul S"]Anthony, congratulations on getting your project to this point! I mention without referring back to your schematics, I think you will be glad to have test points, along with variable resistors (trim pots) to re-set operating poi...
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Wait a minute ... will a choke input work with a gas tube as a load? The choke-rectified input is designed to work into a resistive type load, but basically acting itself as a voltage source, capable of psuedo regulation over a wide range of lo...
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[quote]very short tube, shorter then it should be[/quote]Hmmm, I'll have to double check. This is actually one of the tubes you sent me. It is a little taller than a 6H30. I bought a bunch more off of eBay but haven't fired them up ...
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Possible, I never was a big fun of 6E5P without Milq type of bias. I remember what when I did the simple fixed bias when a few year back I was trying to make Milq to sound “contestable” with ML2 it was racy and jumpy sound but nothing special. I feel...
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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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[quote user="Romy the Cat"]There was a cool Russian-made tube GU-48... I do not think that it would be worse; in fact I think it might be even better… [/quote]Wait, Romy, you think a RUSSIAN product might be better? That is a surprise!:)Seriously t...
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Hi Romy,Do you have experience with this tube ? I have seen it for first time in german amplifier recently and am curious.R weissman...
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[quote user="Paul S"]A year (and a pair of V2s) goes by like nothing.I just changed V2 tubes again, and this time I dialed the current way down before I fired up the amps, per instructions.After a few minutes, I checked the amps with a (Fluke 189) DM...
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There is one thing that you also need to consider. The way how in ML2 bias is built it is a bit tricky to set bias for a new tube. In ML2 a brains new tube will raise bias very aggressively and then it will return it back as the tube heat up (in ...
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There is one thing that you also need to consider. The way how in ML2 bias is built it is a bit tricky to set bias for a new tube. In ML2 a brains new tube will raise bias very aggressively and then it will return it back as the tube heat up (in ...
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Lamm uses Russian ceramic sockets, at least use to use them 10 yeas back. What he uses not I have no idea. The material of sockets is not as important – the profile of contact is the key. Unfortunately Russian sockets use triangular contact that make...
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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 out there that say they w...
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Hickok Model 600/600A/800/800A/533 Tube Tester Quick Reference Instructions by Daniel Schoo from Illinois.
AC LINE ADJUST: Push P7 and adjust the AC line control until the meter pointer is at the LINE mark at the center of the meter...
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A couple months back I sent to Dima a link with a wonderful collection of audio articles from first part of the 20s century:
http://www.one-electron.com/Misc_Docs.html
In next couple days, talking with Dima he asked me: “Roma, what is REL Company a...
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[quote user="doug s."] i have never heard the rel. but, if you want to hear a tubed tuna at its best, pick up a sherwood s3000ll or later, get it serviced, and run it thru one of your mpx decoders. or get one w/a built-in sherwood mpx. this is...
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[quote]This is very bogus notion[/quote]Well I am glad to see you feel that way. You never know - some people cry foul when such happens. "Hey, that was my idea! And now this guy stole it and put into his own product." It happ...
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Kris,
I personally do not like the whole ides and I have addressed it in here:
http://www.romythecat.com/Forums/ShowPost.aspx?postID=6086
I am not nether equipment or electronics engineer but from what I see they also are very c...
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I do not know why but as I listen to the 80hz Edgar horns more and more driven by the Dynaco tube amp I begin to really like the sound. Even in their untouched form there is some righteousness to the sound. I almost do not hear any serious deficienci...
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Well, I would like to point out that the guys who made the
amp about said absolutely nothing about the amp besides that fact that it uses GM100.
The GM100 needs at least 10W to drive grid and how those 10W made I think would
describe more the soun...
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My 20-50hz TH is not very sensitive. HornResp shows 95db for Ang = 2.0 x Pi.So, it needs power. My 18W GM-70 SET can drive them without clipping, but I prefer to keep amp working at 10% of max power to keep distortions as low as possible, so for TH I...
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Well, Nerone, the differences between any tuners would greatly vary with signal, not even with the strength of signal but rather with the specific location and surrounding of a given station. To make the things conceptually right it wou...
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