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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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The 6C33C preamp? Hm, this is bold. As I see you use it as a single stage buffer with only one 6C33C and couple output with a transformer? I head the Germans built something like this but I never heard it or saw it. I do not feel a need for such ...
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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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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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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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One last thing I can do is buy some Mu metal sheet on Ebay and lined up the transformer can and potted with wax as you said, but that's too much work and probably do not work as well as on a separate chassis, so for now I will listen the way it is an...
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The reason that I built the 6C33C preamp was to explore the 6C33C true musical potential like I did with the 845. Not only did I compare the sound of these tubes in power amp, but also in preamp. The reason is that with power amp you might hit some l...
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I see, this tri-way Quad system for sure shall be much different from regular Quas. I kind of even understand why you stay with open baffle bas to support the system’s bass. For sure it will not Bruckner-style pressurize a room as non-dipole bass wou...
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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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Just finished one mono block 6C33C SE amp.To keep things simple (power supply only need 220V), I used a single driver tube (the second tube is there for backup if not going as planned) through an interstage transformer...
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https://www.instagram.com/p/Bt61U17AxWC/
No special bias sauce, it seems.
...
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A small word of advice regarding wiring the 6c33c heaters.My DSET's have now have several thousand hours of use and I love them to death. I've not heard any amplifier able to do what they do. The first amp has over 10,000 hours now and has never fa...
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Interesting that over the last month it is the third projects where people use 6C33S in preamps. A few days back I have a correspondence with Dutch guy, know to audio hoodlums as Direct Heated Rob:
http://www.dhtrob.com/index_en.htm
...who told me ...
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To anyone contemplating the use of Teflon sockets as pictured and described by me in the post at this link:http://www.goodsoundclub.com/Forums/ShowPost.aspx?PageIndex=10&postID=15499#15499DON'T DO IT.These sockets cannot deal with the heat genera...
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Yes, Jim, you put it very well. Still in case of the 6C33C it only possible to cool the glass and I made experiments blowing a strong flow to the glass and it did cool down the plates. The problem is that it is not a good idea to apply a strong flow ...
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Well, it is getting interesting. I was able to make my Hillock TV-2 tester to test the 6C33C. I spend a few hours to filtering the plate voltage and replacing a couple resistors to 50W instead of the 5W. The plate coils in TV-2 is 100mA but it looks ...
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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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Here is an interesting article by Dmitry Nizhegorodov about his experiences to use 6C33C. (I do not know who Dmitry is) I disagree with Dmitry’s amplifier. Also, I very much disagree with his vision that an amplifier is juts a machinery where voltage...
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If you read my post at:
http://www.romythecat.com/GetPost.aspx?PostID=4235Then you are generally informed about the history of the 6C33C but here is another wonderful and uncommon illustration. It is reportedly a guidance system part of Russian crui...
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This morning I went to MIT Electronics Fleamarket and found something quite fascinating: the RCA made sockets that fit 6C33C. I use Johnson’s sockets (I believe 273-275) that although are more expensive but they hold the 6C33C’s pins horizontally and...
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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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Well - there is a technical literature related the cooling of the tube. According to it the temperature of the glass surface is not equall - it is hire in the places, where heater is visible. So - you can make a pair of radiators, at...
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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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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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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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[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="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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Wow! I did not realized that almost 4 months have passed since I wrote last.
Quite a few things have happened the last 4 months that I have played with the 6C33Camp/preamp combo. I have tried at least 3 different vendors on the Ulyanovsk type, the ...
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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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