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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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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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Srajan Ebaen made a write up about a Polish amp from Ancient Audio
http://www.ancient.com.pl/e_single_six.htm
http://www.6moons.com/audioreviews/ancient3/single6.html
It is good that Srajan do not write about sound anymore, whenever he did it appe...
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Laurent,
The V2 in 6C33C does NOT need to be matched by other characteristic then gain and it is very easy to do. If you have two V2 tubes and they have different entry points for bias but the same gains then you will not detect any sonic cons...
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This week I will be trying to address why the Milq midbass is clipping. This is very interesting one. Currently the Melquiades LF channel uses an output transformer 700R to 5R or 11.83 to 1. I thought before that I have much lower ratio, like 5:1 bu...
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OK, let me to recall. We learned that the “hysteresis” (for a lack of better world) manifest itself on used tube only. Also, what I see in the images the one of the half of the used tube has more “hysteresis” then other. I think it leads to the follo...
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The more I deal with 6C33C the more this tube amuses me. Couple years ago when I started to use a half of 6C33C for my upper frequency channels I wired right and left my Super Milq with half of 6C33C connected to right and left side of the tubes co...
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I see, what they did – the built a perfect sealed chimney with two fans to suck cold air in and two fans to suck hot air out. Well, it might work, even though I do like this idea. I absolutely do not see why such a hot and large tube as 6C33C sha...
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[quote user="Romy the Cat"]Anyhow, the problem is not with Ken Chait or Lamm owners but in the totally foolish expectations that 6C33C might be matched. Well, if you do burn the 6C33C for 50-60hours and do match it by gain, by bias and by currant the...
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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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I see now. Quad can’t be driven by single 6C33C. This is well know fact and I did a lot of experiments with Quads and Lamm ML-2.0. For whatever reason as ML-2.0 drives Quads it produces Stingy Sound. I can’t explain it but it is not the sound that ML...
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Something that has long puzzled me is that circuit designers seem ever determined to wring the last ounce of gain from every tube in a given circuit, or they will "starve" them, and the circuit in turn is designed as if it were simply a mathematical ...
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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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[quote user="KOTriode"]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 ...
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I run some sweeps on the new Melq. It looks like it is moderate, somewhere from 20-21Hz to 22-23Khz. Since I run the 6C33C at near 60W for now it is fun to see how it works. In the scope the repose and the distortion at LF looks kind of funny but I h...
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I unpacked the Gold Grids 6C33C that I got from Bulgaria. Upon very meticulous inspection I did not find that they were in any way different then the regular grid tubes. I did not open a tube to check it further. It is possible that the Bulgarian gu...
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I keep receiving emails from visitors asking me about my views regarding the GM70 vs. 6C33C. I am clearly not in a position to provide any EXPERT opinion because of two reasons. First, I never had a properly built GM70 in my disposal. Second, I ...
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Tr2 is 100Va Tr3 is 120Va. 508v is at the output of the transformer connected to the load. I also measured tube heaters. The 6c33c is 14.2v and the 6e5p is 8.6v. I will not hide that I spent some time staring at the glowing tubes, with only the h...
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Hello everyone,This seems like the place where the 6C33C experts hang out so I figured I'd ask my question here.I'm currently collecting parts to build my very own 6C33C amplifier, and I had bought some of the cheap chinese sockets for it and thought...
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Romy,Nah, I just want to careful with what I have left, dont want to have an amp without tube for now. The gold grid tube probably take a while to get them. From what I remember from a tube dealer who said that these 6C33C need to have the heater bur...
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Romy, are you saying you are squeezing up to 60W from the 6C33C, and the mid-bass is still clipping?!? There must be a better way than cranking still higher plate dissipation!If you need more than 60W from the 6C33C for mid-bass now, perhaps it is ...
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Paul,I used both halves of 6C33C this time, I planned to use two 6C33C and uses each half for more power, but that would shortened the life of 6C33C if run one triode at max power dissipation. I used the C3G as driver, since I dont use negative feedb...
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Potentiometers:
Paul S wrote:"...I could not get the current below 390 mA, even though the pots still turn freely
... How good are these pots? Do they actually have "stops", where they won't turn any further? Again, I ask because it...
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I do not know if Russians still make them. I do not think they do as they hardly manufacture anything nowadays. I presume that there a large stock of them in Russia as Victor Khomenko (from BAT) told that during the peak of the 6C33C production Russi...
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Romy wrote:"...I usually suggest to set your new 6C33C tube for operation of 250mA-270mA, use it for a while and only then set 300mA..."This is what I did; in fact, I've had to leave them set at 250mA so that during warm up they don't go over 310mA. ...
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[quote user="Paul S"] I think, BTW, Romy knows more than he tells about the parallel 6C33Cs. In any case, there are stable commercial examples to draw from, eg., the many examples from BAT. Don't forget, space around the tubes. [/quote] I do not th...
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[quote user="Paul S"] After a few minutes, I checked the amps with a (Fluke 189) DMM, just for drill. Voltage was set down to 175, but current was about 450 mA. Dialing down the pots, I could not get the current below 390 mA, even t...
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Paul,
I do not have any reasons to say anything about bias regarding any other tubes beside the 6C33C.
The point that I was trying to make the most of the people out there do not have a proper load for this CE amplifiers. They feel that when thier...
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[quote user="hagtech"]I have not tried this tube yet. It might push the limits of the tester. The 6.3V heater current supply is nominally rated at 5 amps. It might be ok to push it to 6.6 amps. I have to think about this, make...
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[quote user="DA"]1.How and where to make ground connection to the chassis (signal and power supply and between them)2.What are the test jacks near the 6c33c for (bais..)? In the photos there seems to be a resistor connected to one test jackand ground...
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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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