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Read the Post in new Window Read the Post in Threaded view  Post #1: The short "6C33C Survival Guide". by Romy the Cat on 2007-12-18 
Browse the content of the threads in new Window  Thread: The short "6C33C Survival Guide". in Melquiades Amplifier  20 Replies 
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...

Read the Post in new Window Read the Post in Threaded view  Post #62: 6C33C amp/preamp follow up by KOTriode on 2012-03-14 
Browse the content of the threads in new Window  Thread: A different breed of 6C33C amplifier. in Melquiades Amplifier  84 Replies 
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...

Read the Post in new Window Read the Post in Threaded view  Post #34: The half life of 6C33C and 6C33C preamp. by Romy the Cat on 2011-09-22 
Browse the content of the threads in new Window  Thread: A different breed of 6C33C amplifier. in Melquiades Amplifier  84 Replies 
[quote user="KOTriode"]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...

Read the Post in new Window Read the Post in Threaded view  Post #72: Bias with attitude, bass and transformers... by Romy the Cat on 2012-03-16 
Browse the content of the threads in new Window  Thread: A different breed of 6C33C amplifier. in Melquiades Amplifier  84 Replies 
[quote user="KOTriode"]Romy, in the contrary, it is very unfair to compare my 845 amp with the 6C33C. The main reason is the 845 amp used the best output/interstage transformer available, while the 6C33C's output xformer is pretty good but far from b...

Read the Post in new Window Read the Post in Threaded view  Post #60: Feedback to the 6C33C review. by Romy the Cat on 2012-03-14 
Browse the content of the threads in new Window  Thread: A different breed of 6C33C amplifier. in Melquiades Amplifier  84 Replies 
[quote user="KOTriode"] On dynamic, the 6C33C tube showed its ability to go deep in the bass on Ray Brown trio recording of Soular Energy which is excellent for a 15W SE , the 845 amp can do better, but not by much, but probably because of its 25W ou...

Read the Post in new Window Read the Post in Threaded view  Post #24: Looking in a darkroom for a black cat which isn't there? by Romy the Cat on 2011-09-18 
Browse the content of the threads in new Window  Thread: A different breed of 6C33C amplifier. in Melquiades Amplifier  84 Replies 
[quote user="KOTriode"]Romy,I have good confidence that it was the tubes and not the circuit. I have checked the cathode driver that bias the 6C33C and there was not any problem. Sure if the cathode bias failed, the 6C33C current will shoot way u...

Read the Post in new Window Read the Post in Threaded view  Post #59: 6C33C amp/preamp follow up by KOTriode on 2012-03-14 
Browse the content of the threads in new Window  Thread: A different breed of 6C33C amplifier. in Melquiades Amplifier  84 Replies 
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 ...

Read the Post in new Window Read the Post in Threaded view  Post #22: Reliability and stability of 6C33C? by Romy the Cat on 2011-09-15 
Browse the content of the threads in new Window  Thread: A different breed of 6C33C amplifier. in Melquiades Amplifier  84 Replies 
Well, I would say that “something is wrong” as what you report it is not how it shall be. I had my doubts about the rational to use 6C33C in direct heating coupling but the “danger” in direct coupling uselessly coming from the plate of the driver...

Read the Post in new Window Read the Post in Threaded view  Post #71: Further thoughts by KOTriode on 2012-03-16 
Browse the content of the threads in new Window  Thread: A different breed of 6C33C amplifier. in Melquiades Amplifier  84 Replies 
Romy, in the contrary, it is very unfair to compare my 845 amp with the 6C33C. The main reason is the 845 amp used the best output/interstage transformer available, while the 6C33C's output xformer is pretty good but far from being best for the 6C33C...

Read the Post in new Window Read the Post in Threaded view  Post #86: The Lamm ML2 regulation from different angles by Romy the Cat on 2007-10-05 
Browse the content of the threads in new Window  Thread: Initial thoughts about new/old Lamm ML2s in Audio Discussions  215 Replies 
[quote user="morricab"] The one thing that the Lamm ML2 does differently than nearly all tube amps is regulation of the output stage.  They do this with the 2nd 6C33C that is on the chassis.  Even the KR amps don't do this and I think it is...

Read the Post in new Window Read the Post in Threaded view  Post #3: How long the 6C33C lives. by Romy the Cat on 2006-04-15 
Browse the content of the threads in new Window  Thread: How to test 6C33C? in Melquiades Amplifier  7 Replies 
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...

Read the Post in new Window Read the Post in Threaded view  Post #34: The half life of 6C33C and 6C33C preamp. by Romy the Cat on 2011-09-22 
Browse the content of the threads in new Window  Thread: A different breed of 6C33C amplifier. in Melquiades Amplifier  84 Replies 
[quote user="KOTriode"]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...

Read the Post in new Window Read the Post in Threaded view  Post #25: It will be the 6C33C harakiri by Romy the Cat on 2011-09-19 
Browse the content of the threads in new Window  Thread: A different breed of 6C33C amplifier. in Melquiades Amplifier  84 Replies 
I actually took the remaining dozen of gold grided 6C33C from that eBay guy.  It is hard to say what those tubes might be and it is most likely absolutely not necessary in my case. Still, I figured that to get a dozen of 6C33C for a price of a pair o...

Read the Post in new Window Read the Post in Threaded view  Post #16: The 6C33C cooking recipe. by Romy the Cat on 2011-09-28 
Browse the content of the threads in new Window  Thread: The short "6C33C Survival Guide". in Melquiades Amplifier  20 Replies 
The mean KOTriode in his thread “A different breed of 6C33C amplifier“ jinxed me with his 6C33C vulnerability and today my output tube at right midbass channel went down. The characteristic pings, which via the midbass horn sound like house room is c...

Read the Post in new Window Read the Post in Threaded view  Post #1: 6C41C – the journey to nowhere. by Romy the Cat on 2005-08-24 
Browse the content of the threads in new Window  Thread: 6C41C – the journey to nowhere. in Melquiades Amplifier  1 Replies 
It turned out that I made my Melquiadenisation with 6C33C. Not practically because it is good or bad tube. The choose of 6C33C was partially accidental: in the beginning I was trying to make an amp that would be able to work in multi-app configuratio...

Read the Post in new Window Read the Post in Threaded view  Post #138: Ken Chait and the “annoying” Lamm owners by Romy the Cat on 2009-12-05 
Browse the content of the threads in new Window  Thread: Initial thoughts about new/old Lamm ML2s in Audio Discussions  215 Replies 
[quote user="Paul S"]Aparently, a few people complained back to Ken Chait that his "carefully-matched" (with an adaptor on his Amplitrex AT-1000 machine, i presume) pairs either weren't matched to begin with, or they did not stay matched.  Anyway...

Read the Post in new Window Read the Post in Threaded view  Post #10: Also, a few wood about the AudioValve heat design. by Romy the Cat on 2009-08-21 
Browse the content of the threads in new Window  Thread: The short "6C33C Survival Guide". in Melquiades Amplifier  20 Replies 
I understand that AudioValve would like to keep their generic chasses for all their models but I think what they did with Assistant 100 amp is very wrong in term of chasses architecture. They claim the “special familiarity with 6C33C” but it is not w...

Read the Post in new Window Read the Post in Threaded view  Post #70: Would you like to try the Milq’s basing? by Romy the Cat on 2012-03-15 
Browse the content of the threads in new Window  Thread: A different breed of 6C33C amplifier. in Melquiades Amplifier  84 Replies 
[quote user="KOTriode"]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 w...

Read the Post in new Window Read the Post in Threaded view  Post #47: GU/GM vs. 6C33C by Romy the Cat on 2011-04-16 
Browse the content of the threads in new Window  Thread: How to get a LOT of SET power. in Audio Discussions  106 Replies 
[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...

Read the Post in new Window Read the Post in Threaded view  Post #47: GU/GM vs. 6C33C by Romy the Cat on 2011-04-16 
Browse the content of the threads in new Window  Thread: How to get a LOT of SET power. in Audio Discussions  106 Replies 
[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...

Read the Post in new Window Read the Post in Threaded view  Post #2: The subject of ML2 and ML3: GM70 vs. 6C33C by Romy the Cat on 2012-01-31 
Browse the content of the threads in new Window  Thread: Lamm ML2.2 and Mark the BS teller. in Audio Discussions  7 Replies 
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...

Read the Post in new Window Read the Post in Threaded view  Post #174: 6C33C-B vs. 6S33S-V by Romy the Cat on 2010-03-08 
Browse the content of the threads in new Window  Thread: Initial thoughts about new/old Lamm ML2s in Audio Discussions  215 Replies 
[quote user="jessie.dazzle"] I just poked around on eBay and it seems the 6c33C-B tubes are not so easy to find. There are however plenty of the model 6S33S-V. My understanding is that this is supposed to be a more durable version, intended to...

Read the Post in new Window Read the Post in Threaded view  Post #9: The 55W from a single 6C33C? by Romy the Cat on 2009-08-21 
Browse the content of the threads in new Window  Thread: The short "6C33C Survival Guide". in Melquiades Amplifier  20 Replies 
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...

Read the Post in new Window Read the Post in Threaded view  Post #12: Cooling the 6C33C amps. by Romy the Cat on 2010-01-19 
Browse the content of the threads in new Window  Thread: The short "6C33C Survival Guide". in Melquiades Amplifier  20 Replies 
Thanks, Paul. My Googleised Chinese allowed me to understand that they use some kind of forced cooling but there was not mentioning of it. Upon further inspection I come across to this image: So, the amp has two fans aside to ...

Read the Post in new Window Read the Post in Threaded view  Post #59: 6C33C amp/preamp follow up by KOTriode on 2012-03-14 
Browse the content of the threads in new Window  Thread: A different breed of 6C33C amplifier. in Melquiades Amplifier  84 Replies 
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 ...

Read the Post in new Window Read the Post in Threaded view  Post #39: 6C33C tube. by KOTriode on 2011-10-04 
Browse the content of the threads in new Window  Thread: A different breed of 6C33C amplifier. in Melquiades Amplifier  84 Replies 
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...

Read the Post in new Window Read the Post in Threaded view  Post #66: 6C33C bass. by KOTriode on 2012-03-14 
Browse the content of the threads in new Window  Thread: A different breed of 6C33C amplifier. in Melquiades Amplifier  84 Replies 
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...

Read the Post in new Window Read the Post in Threaded view  Post #4: 6C33C amp by KOTriode on 2011-09-07 
Browse the content of the threads in new Window  Thread: A different breed of 6C33C amplifier. in Melquiades Amplifier  84 Replies 
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...

Read the Post in new Window Read the Post in Threaded view  Post #19: 6C33C clipping @ 20W by KOTriode on 2011-09-11 
Browse the content of the threads in new Window  Thread: A different breed of 6C33C amplifier. in Melquiades Amplifier  84 Replies 
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 ...

Read the Post in new Window Read the Post in Threaded view  Post #33: 6C33C as single triode. by KOTriode on 2011-09-21 
Browse the content of the threads in new Window  Thread: A different breed of 6C33C amplifier. in Melquiades Amplifier  84 Replies 
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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