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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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After swapping all the tubes between the left and right amps, the cycling bias current issue (mentioned here in a previous post) seems to have settled.I now have another question, which I hope other ML2 users might answer; first the context: These am...
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I remember when I built Melquiades I detected that quietly of wire that feeds the grid of output stage with bias, quality of soldering or any other minute detail on this wire was very auditable. I also detected that the proximity of this wire t...
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[quote user="floobydust"]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 procedur...
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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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[quote user="drdna"]In my mind, there are at least three possibilities, and they must be interpreted by experiment with caution:
1. irregular fluctuations in signal (I will call this "noise") result in irregularities in output signal we listen to a...
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[quote user="Romy the Cat"]
I never had a lot of trouble with high transconductance tubes. I use the EC8020 a lot. Stefano, you might look into this EC8020. I never seen it but just looked into the datasheet and it looks very interesting tube and i...
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[quote user="drdna"] It is NOT that better tubes have no vibration. Instead, the tubes that sound best to me seem to have a sort of springy sound, like the sound of a water drop or the sound of the tabla drum being struck. [/quote]
Interesting. My f...
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[quote user="drdna"] First of all, this not an attack on NOS tubes …[/quote]
A very strange introduction. Since when people post at this site feel a need to ask apologies for attack or not attack anything? Also, where this phase “attack” eve...
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Somewhere in 1997-88 I bought a hundred 6C33C. I believe during those years the where more expensive then now and I paid around $7-8 per tube. Over the years burning the 6C33C in pair of VK-60 (8 tubes), two pair of Lamm ML2 (ML2), ML2 with Melquiade...
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This thread has been pretty interesting overall. I've read most of it and would at least like to provide some feedback on the technical side of designing with the 45 and 2A3 DHTs... at least from my personal experience. A few years back I decid...
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Paul, there is a number of inaccuracies in your post.
[quote user="Paul S"]Lots has been written already about tube replacement, but I want to mention my recent experience when replacing the 6C33C output tubes (V2). I had the previous tubes in...
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From the “trusted” sources (whatever it worth) I heard very positive comments about the pre-2004 production compare to the vintage tubes. There is however a twist in it that I hope you will explore as it is very much your subject. The contemporary pr...
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As I previously told to manage six channels built around Russian tubes, and patricianly as different as 6C33C, is a pain in ass. Today, carefully examining my log file that I keep about the performance of each tube in the amp, in addition to everythi...
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Those damn Russkies always threw surprises. Using in Melq the Russian-made tubes, probably very few the most remarkable tubes they ever made, the life defiantly threw some hi-fi astonishments.
The people who follow my saga with Melq know that I do n...
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I not juts actively hate this configuration but also actively abhor the rational that made people go for this direction.
The Morons use horrible power amplifiers and sonically impotent speakers and suffer from harsh and cruel Sound. Instead of tras...
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Paul, another my spin a little off the subject but since it has to do with your current dealing with ML2 I would express it here.
Since you use some tube gear then why you agree to be a slave of random circumstances? Tubes have problems – they go o...
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Jim, actually I see your PO Box at your site, is it the place where I need to send the tubes?
I undusted what you are saying. It is easy to pick the obviously bad tubes but it is much more complicated to have a tube that is “a half way there” and b...
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Tubes came today. [quote]solve the problem of what we should test for[/quote]I don't think you can get one tester to do everything. Not only does one need the basic parameters such as transconductance, but you have shorts, gas, leakage, m...
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Yeah, so the closeness of the grids results in a higher current gain. So what? What is the relationship between gain and sonics? Are you saying that all high gm tubes sound better than low gm tubes? And does that include 300B ...
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Since yesterday when I made above posted announcement I’ve got a number emails asking what the hell it is, what topology and what tubes were used. The phonocorrector uses two tubes and a proprietary “patent pending” Electron Intensification Interface...
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[quote user="haralanov"]N-set, a friend of mine built an amp with this monstrous USSR tube. It has 3 stages and the GU81M is driven by 6C33C. Within context of driving mid or high sensitivity bass drivers, this is all you need. In comparison, his pre...
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I think the key to understanding this case is that it is beginning to look like the tubes that came with the amp all were over the hill, electrically. Since I have no way to test them other than by ear, that is what I have done. So f...
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Adrian, Thanks for a most interesting post. I can't fully respond to this as I don't have the new tube brands you have. I posted earlier regarding my personal findings with the EML 45 solid-plate versus NOS however. Ultimately I found that...
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I do not know here to start. I absolutely assertively insist that under normal circumstances it is absolutely imposable to buy matched pairs of NOS tubes, particularly the high Mu tubes. When sellers advertised the “matched pairs” I just discard the ...
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Adrian,
Are any of those new tubes besides the Chinese tubes are single plated? I have bought some very nice 2A3 and 6A3 double plated from 1942 and 1944 and it will give me an ability to see what is going on with vintage tubes.
I was not ...
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I put the final two layers on the choke and temperately closed the amp up as it will be finally done, laying all cables right and so on. The loaded MF channel now has 0.8mV RMS. So, forget about any noise.
Playing the amp today a...
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Hi Romy,The Vacuumstate amplifier is not a parallel SET it is basically like push pull but with some kind of trick dynamic bias control that keeps the tubes really together. Much of the low level information that gets lost with the usual push p...
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I tried listening for a while this morning, figured the electricity was not good enough. When I went to switch off the amps, I immediately noticed that BOTH 5651s had failed spectacularly, with cracked bases and "white-out" on the top...
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Paul, the dirty pins are the pins that become dirty because of corona burns the pins. It is unless you marinade tubes in A1 souse before you place the tubes into the amp. I would hardly belie that it is possible to cracked 5651 no meter how rough you...
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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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