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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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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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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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Romy,
I noticed in several photographs of the various Melqs that you are using the Hal-O dampers on your driver tubes and sometimes on the regulators. The ones in your pictures are the earlier versions of Herbeleins' products with the thick polymer...
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Morricab,
I do not know the “truth” and what I said are pure my speculations based upon what I hear and what I measure.
Yes, Lamm drivers at 310mA quite hard but do not forget that his objectives, besides everything, were to get out of his SET max ...
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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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Just some additional thoughts on the new generation of 2A3 tubes. The only ones I would seriously consider are the Kron Enterprises, the Sophia Electric, and the Emission Labs tubes. If I did not hear these side by side over an extended period of ti...
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[quote user="Romy the Cat"]Those dam Ruskies when they did the YO186 then made it to have an absolutely idiotic pin layout. The layout is very simile to 2A3 but one of the pins a few mm away, far enough for me to consider that it would not be s...
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Johann, in any case I would not leave lifted. You do not want to have inside tube anything that has no referent to anything, it is like a transformer – you do not want to have in it any coils that are not connected to anything. I would say the to gro...
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The concept of self-testing boot cycle is nice one but it for sure could not be done during the amp booting. Some tubes do need to warm up and reach the cruse temperature in order to be tested, some do not. Some tunes (like 6C33C) in fact is best to...
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Romy,The normal bias for the Golden Grid tube for 200V Plate at 200ma is about 70V-80V for the good tubes, the bad tube read 0ma at this bias, when drop to -30V it start reading some current, but can't get to 150-200ma current for the SE amplifier.Th...
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HI Paul S,??? Paul you wrote "re-grease tube pins and sockets" ??? That must be some very conductive HIGH temperature grease. I personally keep my amplifiers' tube pins and sockets dry. Maybe you know something here that I have missed all these ...
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Hi, I buillt the amp based on your circuit with the exception of the bias scheme. Currently I have CRCRC bias for the ouput valve and Lithium battery grid bias for the driver. I use the amps to drive low efficiency 2 way ported boxes and vintage Tann...
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Hi Domidaw ! The first thing that we need to find out - is a REAL tube plate current at the moment when the R22 resistor starts smoking . I mean not a calculations that might be based on some faulty conclusions but a real current that an ammeter does...
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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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[quote]I really do not understand what conclusion you make by shutting the tube down.[/quote]I make no conclusion. It's just an interesting thing to watch. A good experiment. I was hoping it would be a clue for everyone here.Since t...
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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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Hi, these ones are Russian military stock: see that no mica elements have been used in their construction, like the US Bendix Red Bank tubes (used in US ICBMs of the '50's-'60's). Old Soviet ICBM spare stock ?I happen to have a lot of ...
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Hi Dirma,Unless you can prove me something else: the ones I have (0C2s and 0B2s) are printed "Made in USSR" very clearly.I doubt that Canadian General Electric, or Sylvania, put this lettering on the tubes to conceal another ...
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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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I do not have any special love with GU-48/833 and I named them only as examples. If somebody do it then I would root for GU-48 instead of 833 as the GU-48 are much cheaper, easy to get and Russian tubes tend to be more bassy then western tubes (and l...
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Do not even try your tube amps with SL600!
The SL600 is very low sensitivity and if you drive it with more or less powerful SET amp then you will ruin SL600. I have destroyed 6 (six) of SL600. A 5 minutes of driving SL600 with 8W-10W SET as r...
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Assuming that by rocking the tubes too aggressively, one might cause the socket to lessen its grip on the pins: One way to check this might be to break open a set of dead tubes and remove a single pin from each, then hold each pin, one at a time, in ...
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[quote user="JJ Triode"]Romy, take a look at EML 30A and its cousins:
http://www.emissionlabs.com/datasheets/EML20B.htm [/quote]
Yep, thanks, JJ. Still the EML 30A has a lot of gain but it has also very high plate impedance as well. As much gain w...
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Wonder if ordinary "di-electric grease" would work on tube pins? Anyone ever try it?It works for old car distributors and electrical service connections, which is to say, other high votage applications.Like I said in the ML2 thread a few p...
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[quote user="Romy the Cat"]The concept of self-testing boot cycle is nice one but it for sure could not be done during the amp booting. Some tubes do need to warm up and reach the cruse temperature in order to be tested, some do not. Some tunes (lik...
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I never had any fuses in my amp and never had any need for it. I have a fuse at my DHT channel as the tube is rare but not on the 6C33C. I do not really understand the problem you have with current. You have the meter that shows you current in real t...
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A few years ago somebody, I think it was “drdna” from California, told that he has a habit to listen the mechanical noise of the tube hold the tube at his ear by hitting the balloon of the tube. I did not exactly acknowledge it at that time as it was...
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peter wrote: By "dynamic viscosity" do you mean the reluctance of an amplifier to be dynamic, i.e., the degree to which an amplifier sounds like it is bogged down, usually as a result of a poor rise time on transients, i.e., poor HF response, or a tu...
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JJ,
yes, I got Hal-O dampers a few years ago and I do use them but it would require more say then just “I use” them.
I have them for a long time. I initially bought then to use with 7788 tubes that I am employing as an input tubes in my phonocorr...
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Hi all ! I thought about this resistor bias idea that Chris proposed , and found some some problems here . One of them discovered Chris himself - it is a big serial resistor in the grid chain , and it can cause not only HF rolloff ( it isn't a big pr...
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