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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 #39: The “magic” testing for 6C33C was found? by Romy the Cat on 2007-01-26 
Browse the content of the threads in new Window  Thread: Get, or made up a tube tester, it’s necessary in Audio For Dummies ™  44 Replies 
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...

Read the Post in new Window Read the Post in Threaded view  Post #2: Good luck with that ....:-) by Romy the Cat on 2019-04-20 
Browse the content of the threads in new Window  Thread: Valve Preamplifier for Macondo/DSET in Melquiades Amplifier  74 Replies 
Anthony, I know what you feel but I am no sure that I might be too useful for you quest. Let me to explain first the points you made.   I do not know why Placette does not work in your situation. You do not have enough volume? If it is the case ...

Read the Post in new Window Read the Post in Threaded view  Post #172: I wonder why Lamm does it. 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 
You have this behavior with the tube that you run for 6 month? That is strange. The behavior you described (with this amps) is typical for a very fresh new tube but after 20-50 hours  the amplitude of the current raise shall be minimum and and af...

Read the Post in new Window Read the Post in Threaded view  Post #346: A question about the polishing the things…. by Romy the Cat on 2009-06-21 
Browse the content of the threads in new Window  Thread: Single-stage Melquiades vs. DHT amps in Melquiades Amplifier  397 Replies 
[quote user="floobydust"] Paul,I suppose that new vs old between the 45 and RE604 could account for some differences, but it's more of an "apples to oranges" comparison. Pushing the 45 beyond it's ratings is not a great idea... especially the cat...

Read the Post in new Window Read the Post in Threaded view  Post #136: The Lamm’s ML2 regulator. 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 
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...

Read the Post in new Window Read the Post in Threaded view  Post #12: The 6E5P-2A3 Milq? by Romy the Cat on 2007-12-05 
Browse the content of the threads in new Window  Thread: The 6E5P tube data. in Melquiades Amplifier  44 Replies 
[quote user="drdna"]  Well, and I have a dozen of them sitting here next to my desk while I am building my Milq amp s-l-o-w-l-y so I guess I will discover my audio intelligence level sometime after the New Year.[/quote] That is so cool that you...

Read the Post in new Window Read the Post in Threaded view  Post #33: The 6C33C’s avalanche heating as an urban legend by Romy the Cat on 2007-01-24 
Browse the content of the threads in new Window  Thread: Get, or made up a tube tester, it’s necessary in Audio For Dummies ™  44 Replies 
Well, it is not necessary a fully qualified urban legend as the problem does take please with fixed based 6C33C but..... only under certain conditions. I have written about it a lot on my site but will very briefly recall it again. Dima might be cor...

Read the Post in new Window Read the Post in Threaded view  Post #383: Rethinking the YO186 tube. by Romy the Cat on 2011-03-31 
Browse the content of the threads in new Window  Thread: Single-stage Melquiades vs. DHT amps in Melquiades Amplifier  397 Replies 
Last night I was listening  Zubin Mehta’s recording of Bruckner’s Symphony No.9. It was his first recoding from 1966 with Vienna. I am not a big fun of this performance all together but it has spectacular first movement. It played superbly slow and s...

Read the Post in new Window Read the Post in Threaded view  Post #12: Please check for shorts and mistakes before investing in another trans... by JJ Triode on 2022-01-02 
Browse the content of the threads in new Window  Thread: R22 in Melquiades Amplifier  34 Replies 
Domidaw, you wrote: The photo shows the capacitor c10. Its minus is connected to ground, its plus goes to the output transformer,According to the schematic it is the grounded (minus) end of C10 that should connect to one side of the output transforme...

Read the Post in new Window Read the Post in Threaded view  Post #17: Blindly: One vs. Another by Romy the Cat on 2007-01-15 
Browse the content of the threads in new Window  Thread: Lamm Industries: a special interview with a special company in Audio News  105 Replies 
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...

Read the Post in new Window Read the Post in Threaded view  Post #396: Hm, what the hell is going on? by Romy the Cat on 2013-08-20 
Browse the content of the threads in new Window  Thread: Single-stage Melquiades vs. DHT amps in Melquiades Amplifier  397 Replies 
[quote user="Romy the Cat"]That sucks. I use to have a box of perhaps a dozen of YO186 but I did not see it for a while, pretty much from the time I moved to new house. I was listening today some of my “critical” reference stuff and concluded with ve...

Read the Post in new Window Read the Post in Threaded view  Post #6: 6C33C amp. by KOTriode on 2011-09-08 
Browse the content of the threads in new Window  Thread: A different breed of 6C33C amplifier. in Melquiades Amplifier  84 Replies 
Without regulation, this amp would not work correctly due to its design: DC coupled and fixed bias. The high transconductance will make the bias current varied as much as 50-100ma due power line fluctuation without the regulators. It mi...

Read the Post in new Window Read the Post in Threaded view  Post #25: Returning back to basics. by Romy the Cat on 2007-04-29 
Browse the content of the threads in new Window  Thread: The one-stage Melquiades. in Melquiades Amplifier  74 Replies 
Jim, returning back to the subject of tube testing…. I do not know if you have seen my most recent obsession; the idea of driving my Macondo with 1.8W of a single 6E5P: http://www.goodsoundclub.com/LatestPosts.aspx?ThreadID=4241 So, what I learned...

Read the Post in new Window Read the Post in Threaded view  Post #5: Writing from Sweden about the 6C33C by Romy the Cat on 2007-04-19 
Browse the content of the threads in new Window  Thread: Macondo – Super Melquiades: few months later. in Melquiades Amplifier  10 Replies 
This is by Hans Beijner. His site is: http://www.tubetvr.com/In 1976 a Mig 25 fighter jet landed in Hokkaido in Japan, it was flown by a soviet military pilot that wanted to defect to the west. This was a real field day for western miltary peopl...

Read the Post in new Window Read the Post in Threaded view  Post #14: Re: “A” sound from “B” system? by deemon on 2005-08-04 
Browse the content of the threads in new Window  Thread: “A” sound from “B” system? in Audio Discussions  13 Replies 
Hi all ! [quote user="morricab"] Hi Romy, Could you explain a little more about the amp?  If I understand you correctly it is a 1 tube stage with solid state (Mosfet or Bipolar??) output.  If it is Mosfet then it is likely to be running w...

Read the Post in new Window Read the Post in Threaded view  Post #14: The alternative output tubes. by Romy the Cat on 2010-03-01 
Browse the content of the threads in new Window  Thread: More power from Melquiades? More powerful tube? in Melquiades Amplifier  19 Replies 
[quote user="cv"] Consider a triode connected 13E1. 95W dissipation, will probably work beautifully with the existing OPT if you adjust the gap down and if you can rewire your arrays to present a somewhat higher impedance.Something like 400V-450V / 2...

Read the Post in new Window Read the Post in Threaded view  Post #344: DHT drivers by nl on 2009-06-17 
Browse the content of the threads in new Window  Thread: Single-stage Melquiades vs. DHT amps in Melquiades Amplifier  397 Replies 
Why do we use DHT tubes? it is not because of their technical specifications. They have low transconductance, a problematic direct filament, and they cost a lot.Obviously, it is because of their sound. Some people like it and some people don't.The DH...

Read the Post in new Window Read the Post in Threaded view  Post #4: Conflicts resolution. :-) by Romy the Cat on 2018-08-27 
Browse the content of the threads in new Window  Thread: Paul McGowan. tubes in preamp in Audio News  12 Replies 
Well, the conflict you pointed might sound reasonable but not completely. The First quote is taken from a thread “Disregard Digital with Vacuum Tube output”. In there I advocated do not look into D/A converters with tube output stages. In was in 2...

Read the Post in new Window Read the Post in Threaded view  Post #40: Irrelevancy of my question and 6336 by N-set on 2010-11-03 
Browse the content of the threads in new Window  Thread: To drive the 6C33C... in Melquiades Amplifier  65 Replies 
Thank you Romy, that was very informative and instructive!I don't completely agree that OP is absolutely irrelevant for linearity.It can happen that some regions, under given design constraints, will not give "a proposer harmonic structure of your s...

Read the Post in new Window Read the Post in Threaded view  Post #357: The era of enlightenment. by Romy the Cat on 2009-06-26 
Browse the content of the threads in new Window  Thread: Single-stage Melquiades vs. DHT amps in Melquiades Amplifier  397 Replies 
[quote user="Romy the Cat"]The events of the last 3 days are incredibly stupid, incredibly interesting and very educational. During the last few days I have discovered some very interesting phenomena, ok might be no a phenomena but a behavior, th...

Read the Post in new Window Read the Post in Threaded view  Post #52: Super Milq 6 channels diaries: I am through by Romy the Cat on 2007-11-01 
Browse the content of the threads in new Window  Thread: 6 Channel Version of Super Melquiades in Melquiades Amplifier  131 Replies 
Ok, now it is done and it is official as I see nothing available for conceptual improvement in the crossover circuit. Interestingly this version offers the most interesting sound as well, since the circus was tune for sound, not vise-versa, it is wha...

Read the Post in new Window Read the Post in Threaded view  Post #2: Kleiber surprises while Gergiev snores: Placette Active by RonyWeissman on 2007-02-24 
Browse the content of the threads in new Window  Thread: The ultimate buffer – light in the end of a tunnel in Audio Discussions  36 Replies 
Just a brief note on my recent addition: Placette Active preamp.  Due to a recent purchase of Tannoy Golds, I had the opportunity to pull an old McIntosh SS amp out of the closet recently.  This amp has gain controls, so I tried running it ...

Read the Post in new Window Read the Post in Threaded view  Post #58: Lamm ML3 and the clipping characteristic. by Romy the Cat on 2008-09-05 
Browse the content of the threads in new Window  Thread: Lamm Industries: a special interview with a special company in Audio News  105 Replies 
One more thing that I would like to point out in context of the recent Marc Mickelson’s review. Marc wrote: “The Atma-Sphere amps are certainly more powerful than the ML3 Signatures, but not noticeably so unless you clip the Lamm amps. “ Here is wh...

Read the Post in new Window Read the Post in Threaded view  Post #111: The art of ULF volume adjustment. by Romy the Cat on 2011-05-08 
Browse the content of the threads in new Window  Thread: Macondo’s lowest channel. in Horn-Loaded Speakers  150 Replies 
[quote user="Romy the Cat"] For a casual observer it might appear that I am constantly fought with my ULF, finding and loosing better and worse configurations.  It might be so but I have a very strong sense of objective of what I would like to ac...

Read the Post in new Window Read the Post in Threaded view  Post #23: It means exactly what it means. by Romy the Cat on 2014-12-17 
Browse the content of the threads in new Window  Thread: SET amplifiers in Audio Discussions  30 Replies 
[quote user="noviygera"] What does this mean? Let's say the OT is 5K:8 where is this loading coefficient coming from? And how can it be adjusted? If the R(e) of a driver is let's say 12ohm, does this mean the secondary of the OT must be 12ohms for...

Read the Post in new Window Read the Post in Threaded view  Post #61: Used Tubes by audiosix on 2013-12-26 
Browse the content of the threads in new Window  Thread: Where are our good phonostages? in Analog Playback  61 Replies 
[quote user="Paul S"] http://app.audiogon.com/listings/omnigon-full-function-tube-preamplifier-phonostageLooks like a serious effort that has been kicking around for a while.What tubes are used? Are they twin triode, like 12AX7 or - more likely - 692...

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 #160: All fixed? by anthony on 2019-02-02 
Browse the content of the threads in new Window  Thread: Planning my DSET in Melquiades Amplifier  186 Replies 
So, my two problems have been fixed, I think.First was the issue with the 6e6p  for the HF Channel not being able to draw enough current.  I checked the bias and it was fine and the potentiometer allowed plenty of adjustment so I changed nothing in t...

Read the Post in new Window Read the Post in Threaded view  Post #40: the sound of one trace looping by hagtech on 2007-01-26 
Browse the content of the threads in new Window  Thread: Get, or made up a tube tester, it’s necessary in Audio For Dummies ™  44 Replies 
It's hard to predict how the anomaly will sound.  Sort of like a dynamic bias shift in the tube.  That's why I think IMD.  The shift moves around at LF rates, so the HF reproduction can fall on any number of load lines (within loop are...
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