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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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I was thinking about the subject for a long time. People in audio love to make generalization, so do I, but in it is not so simple. People attribute to output tubes some “special” qualities but I more interested not about unnecessary drooling about A...
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Here is the general specification for the parts that I used. The selection of the parts implies some liberty of course. It will be your amp after all, not mine - do whatever you wish. In some case when I feel that requirement is critical I will stres...
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Yes, my friends called me that too, but hey, I can't help it, my curiosity on tube amp get the best part of me, plus I can't build enough power amp to power all my 3 tri-amp system. I collect all kind of transformer, just for the 845, I tried about 6...
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KOTriode, …no one questions the usefulness of having a regulator and the ability to adjust voltage and current independently. However, it is necessary ONLY during a design phase and sine you have figure out the optimum operation point for a given tub...
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Few weeks ago, I had the chance to visit KOtriode and listen to his system but more specifically his Preamp. The preamp use half of the 6C33C per channel (one 6C33C has two triodes). It has two outputs, one is transformer coupled output, the other is...
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Hi Jim ! You wrote about "hysteresis" in the 6C33C curves - it seems to be a very interesting point ! Maybe Romy told you about one fault of this kind of tubes - some old ones have a bad tendency of "thermal breakdown" . I mean positive thermal ...
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Interesting, in my amp the whiteness of the 6C33C sockets never bothered me. I think if it bother you then you might located the socket slightly below the top panel, this way you will not see them so easer. If you use ceramic base then ceramic is pai...
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[quote user="son"]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...
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KOTriode, We had this conversation before. It is not what I regularly experience. The 20% of faulty tubes is astonishingly high number for this tube and if he has this ratio and did not change his suppliers then he must be crazy. On the good side you...
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[quote user="KOTriode"]Romy,I looked at your Melq schematic : http://www.goodsoundclub.com/PDF/Melquiades_SET.pdf regarding the 6E5P bias. Would it be simpler to use two alkaline battery in place of R5 to provide 3V , or 3 Rechargeable for 3.6V ...
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[quote user="Genn"]However - you decided to use 6E5Pi to drive 6C33C, and the filed of competition in this case might be higher - including those E810F, E180F, EL84.. or even 12AT7, or even (probably) WE 437. Some of them would need...
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ZZ, I'm thinking, ramp up the properly-sequenced DC first (and perhaps we go on from here to the earlier-discussed matter of heating and shutdown sequences for each tube...). After that, when I send signal, I start low and ease up on the volume until...
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[quote user="Romy the Cat"]To simplify everything: the Melquiades was at attempt to make two stages, capacitor coupled, no feedback SET, having the cathodes sitting on ground and using the unique 6E5P as a driver. My selection of output tube was beca...
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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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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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[quote user="drdna"] How about using the 6C33C for the low midrange-woofer, the 2A3 for the upper midrange, and the 45 for the tweeter? I suspect if each circuit can be optimized, that they can do their best within each frequency range. [/quote] Hm…....
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Got today a party of the 6C18C from 1960s, an interesting tube. The plate looks like 1/4 times larger and has no bridge between the halves. The 6C18C has even less plate impedance than 6C33C and it appears that it futures inside more “colorful” metal...
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I used those VPI magic brick sitting on top of the transformer, my audio analyzer tell me that these bricks helped the noise by about 1db, may be the 6 lbs or so weight does damp the xformer vibration, so I leave them on, just trying everything to ke...
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N-set, I understand you do not mean to hijack the thread with the Axiom, so I actually tried to make generic and/or thread-related observations. I don't know the 6E5P, but generic issues with specific DC tank circuits and driver and output tube stab...
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Totally disappointed today, while I was listening to music, the left channel make a small pop and quit. The bias meter showed about 25ma bias instead of 200ma. Test the tube on bench showed that the tube current stay about 25-50ma max. This tube is g...
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Sine I informed public about Melquiades amplifiers I receive many emails from people asking me about the operation points of 6C33C. For whatever reasons people mistakably took me for some kind of 6C33C guru, which is am not. Moreover I could be hardl...
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[quote user="hagtech"]Hey, I never thought of this. You can run 1/2 the tube at a time! This actually puts it within the limits of the VacuTrace. I can test each side separately.[/quote]
..and while you do so you might discover one...
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N-set, starting from reasonable input, the 6E5P can swing some serious voltage, and Romy also sings its praises in terms of sound. Maybe sim that, running it in its safe zone to a 6C33C. From there, you have all the power you'd want to drive -- what...
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skushino wrote:"...I was operating my amp around 275mA for the same reason as you, to have a margin before V2 runs off the cliff..."About that cliff... As a result of not fully backing off the plate current trim pots (thinking a few turns would suffi...
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Well, it looks like I got fucked by the transformer company.that realy sucks !!! I have not talked to them yet ,but even if they agree to replace them it will take at least 6-8 weeks plus international shipping cost , import tax , VAT .Filament tran...
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I just finished the GM70SE amplifier. It is built on the same size chassis as the 6C33C (with few extra holes) but 1/2 in higher to accommodate quite a few extra parts.
The GM70SE is built with quite interesting feature similar to 6C33CSE :- Double...
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I am certainly looking into an integrated solution. The first thing that I need to do is determine a safe distance to keep those 6C33C's from the wood or drivers. I have listened to Tax's fullrange Melquiades once but was not thinking at the time a...
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There are no relays in the ML2 that might produce the “violent switch-on pulse… which threatens to blow your speaker”. What you have is a dead V2 tube. When 6C33C dies then it begging to produce the erratic pings. Juts replace the tube and you should...
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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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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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