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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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The preamp has the classic tube regulated power supply using 5R4, 6AS7, 6SJ7. It is transformer coupled output and has no capacitor in the signal chain, the gain is about 8db, so it is not a buffer. For convenience, it does has a remote control. It i...
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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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Thank you for the comment on this amp, this is my first time of using the 6C33C tube, I decided to build this amp after reading about the Melquiades, this amp is just a quick experiment on the 6C33C sound, since I have...
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[quote user="KOTriode"] Thank you for the comment on this amp, this is my first time of using the 6C33C tube, I decided to build this amp after reading about the Melquiades, this amp is just a quick experiment on the 6C33C sound, since I have a s...
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Romy,
I ran the tube conservatively at 40W, because it is still breaking in, and I do not want to push it too much power to damage it (then I will have to break-in a new tube all over again). This amp can give max power at 20.35W (12.76Vrms into 8 ...
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I am not too worried about the 6C33C bass, since I have other alternative. Even if lower loading will improve it, the problem is to get more power out of the 6C33C to a 40W (PSE perhaps) level to be able to drive the 12in or 15in woofer, even then th...
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Ok, I will try to lower the primary impedance like you suggested, but it will be on the new 6C33C mono block amplifier that I am building. The custom made chassis will be finished by next week and I have the better components waiting to get installle...
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Hallo Romy, i'm interested with half triode at 6C33C , but im confuse how to set it,... Full Triode : pin 1&2 give 6,3v , pin 6&7 give 6,3v.Half Triode : series pin 2&6 1&7 give 12,6v or just use pin 1&2 give 6,3 vthanks before......
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http://www.sitefile.org/showimage/6/6c33c.htm
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it is worth reiterating in this thread -- and perhaps Romy should update his advice in the relevant section -- that exotic japanese teflon sockets such as the one made by yamamoto soundcraft are no good for the 6c33c, whether because of insufficient ...
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[quote user="Romy the Cat"]Iraschwips , sorry that your post was deleted. The site
was hacked this morning, I fixed it and your post was the only casualty. I
restored it under my name and since you reported it we all set for now.[/quote]
That’s ...
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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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Perhaps I am asking for trouble, but did anyone had any experience with those SE mosfet creations made by Susan Parker?Preamp uses Romy`s beloved 6C33C tube and the 10W power amp has two transformers, two resistors, one mosfet and that`s pretty much ...
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Hm, a German company Audio Valve clams that this new Assistant 100 amps has
“110 w sinus wave - 1khz / 1% dist. / 8 ohm load, per channel”
http://www.audiovalve.info/nav/assi100_en.html
That is bold statement even if you drive...
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This subject of comparing the quality of ML2 and ML3 sound is very interesting and I do not think that it will be ever observed in public. I hoverer do have interest to learns about comparative capacity between properly sounding ML2.0 and ML3. The M...
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After trying all the might be tried with 6C33C (measurement-wise) I concluded that I know that tube very well …in order do not test it. All that I do is taking a new tube, burn it until the start up current is stabilized:
http://www.good...
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I am familiar with the fresh 6C33C behavior, and I do set bias much lower while burning them in. This set of tubes has been installed for about 3 months; the amps are operating about 45 hours a week. Before switching them on the next time, I'll t...
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[quote user="Paul S"] It took ~3 1/2 hours for the system to charge up and start working as a system again, and then I tried Romy's suggestion to try dropping current (and raising vlotage) on the ML2s. I experimented again and stuck with the 16...
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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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The 6C33C was available with 1,2,3 anodes. The version with one anode known as 6C41C. It kind of smaller tube with the rest practically identical characteristics with ½ 6C33C. Did anyone ever hear how this tube sounds. Bas Horneman uses i...
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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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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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OK, first off all I have moved the latest posts to the “How to drive 6C33C” thread.
Regarding the operation point. My initial intention was to give Melquiades’ output as ML2 did: 175V, .310mA. What is important is to understand that for LF channel I...
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It is completely irrelevant how frequently an amp switched off and on if a soft start is made properly. A few years ago my friend and I, having the 6C33C based Lamms ML2 (where I do not like how the soft was working) , noted that we both change the o...
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It is completely irrelevant how frequently an amp switched off and on if a soft start is made properly. A few years ago my friend and I, having the 6C33C based Lamms ML2 (where I do not like how the soft was working) , noted that we both change the o...
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[quote user="Romy the Cat"]Anthony, I think you take the right this in a wrong way.
Sure the quality of the coupling caps is important but you truly shall not be worry
about it. Make the amp, get comfortable with it and then change the damn cap.
I...
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[quote user="hagtech"] Please do. I have interest in the result myself and don't mind spending the time. I can post photos for each tube. [/quote]
Sure, let do it. Email me your address and I will send them to you. (Do you have sockets?)...
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Was talking with various audio people about the 6C33C I was amazed that people are so clueless about this tube. The people are so filled with some foolish prejudges and faulty notions about 6C33C that I deseeded to put together a brief “6C33C user ma...
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Very interesting, and no surprise, really. But who makes a tester that allows for dynamic testing of the 6C33C?I suppose we will just have to keep our ears open, as ever, in order to know when something is not right for our own applications.It ...
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Since I know about a few ongoing attempts out there by different people to build Melquiades I would like to share with some of my observations regarding corrections, simplification and possible modifications of Melquiades amplifier.
Obviously you ha...
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