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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 #5: Re: 7788 - love the tube! by hagtech on 2006-02-15 
Browse the content of the threads in new Window  Thread: 7788 tube mic pre design in Analog Playback  38 Replies 
Yeah, so the closeness of the grids results in a higher current gain.  So what?  What is the relationship between gain and sonics?  Are you saying that all high gm tubes sound better than low gm tubes?  And does that include 300B ...

Read the Post in new Window Read the Post in Threaded view  Post #31: 6C33C preamp by KOTriode on 2011-09-20 
Browse the content of the threads in new Window  Thread: A different breed of 6C33C amplifier. in Melquiades Amplifier  84 Replies 
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...

Read the Post in new Window Read the Post in Threaded view  Post #10: What the tube trace might show in the real world? by Romy the Cat on 2007-01-08 
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 
[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...

Read the Post in new Window Read the Post in Threaded view  Post #29: The tube testing show, it is very interesting… by Romy the Cat on 2007-01-22 
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 
[quote user="hagtech"]Note the '63 has much higher gain.  The horizontal spacing is basically "mu".  Interestingly, the 6e6p has lower gain than both of these.  To me, the curves are beautiful.  Spacing is relatively constant, ind...

Read the Post in new Window Read the Post in Threaded view  Post #28: My experience with 7788 is very different. by Romy the Cat on 2008-01-13 
Browse the content of the threads in new Window  Thread: 7788 tube mic pre design in Analog Playback  38 Replies 
Jim, I do not know what to say: I never experienced any nose problem with it. A few years ago I built 2 mono phonocorrectors with 7788 at input as a pentode both of them were just nice and quiet and did not give me any problems in noise department. T...

Read the Post in new Window Read the Post in Threaded view  Post #32: Audiopax Model 5 Audiopax model 88 by Amir on 2019-09-17 
Browse the content of the threads in new Window  Thread: My Audio Philosophy in Playback Listening  95 Replies 
finally these beautiful pre/power delivered to me and they are playing music for break-in.I will report about sound of Audiopax model 5 & Model 88.The system :   CEC TL0 3.0 Transport     Audio Note DAC 5 Special      Audiopax model 5     Audiopa...

Read the Post in new Window Read the Post in Threaded view  Post #26: pulse tube by hagtech on 2007-04-29 
Browse the content of the threads in new Window  Thread: The one-stage Melquiades. in Melquiades Amplifier  74 Replies 
With this tube I would think cathode emission limits lifetime.  Stepping back a moment, I'm guessing this tube is designed for radar operation.  Maybe in an aircraft.  The spec sheet definately talks only about pulse mode of opera...

Read the Post in new Window Read the Post in Threaded view  Post #66: Debugging. by Romy the Cat on 2013-11-19 
Browse the content of the threads in new Window  Thread: Full range Melquiades implementation in Melquiades Amplifier  81 Replies 
Hm, it is interesting.  The loud popping pings in the lower MF and upper bass region are unmistakably signs of the 6C33C be gunner. Then you replaced the tube and the pings are still there. It is very highly unlikely. You might burn a cap that interm...

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 #4: 6C33C tube lifetime by morricab on 2006-04-18 
Browse the content of the threads in new Window  Thread: How to test 6C33C? in Melquiades Amplifier  7 Replies 
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...

Read the Post in new Window Read the Post in Threaded view  Post #42: How the amp sounds? by Romy the Cat on 2014-06-15 
Browse the content of the threads in new Window  Thread: The 6E5P tube data. in Melquiades Amplifier  44 Replies 
Celsius, I do not know what CCS you impended, did you drive 6e5p’s plate with constant current source? I also do not know/like 6e5p with battery bias. The only application that I find 6e5p suitable was the Milq-style bias with two gas tube driving ...

Read the Post in new Window Read the Post in Threaded view  Post #21: 6C33C reliability disappointment! by KOTriode 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 
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...

Read the Post in new Window Read the Post in Threaded view  Post #71: Charting Value by Paul S on 2009-02-12 
Browse the content of the threads in new Window  Thread: The one-stage Melquiades. in Melquiades Amplifier  74 Replies 
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 ...

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...

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 #1: Single Ended Triode distortions.... by Romy the Cat on 2006-04-01 
Browse the content of the threads in new Window  Thread: Single Ended Triode distortions.... in Audio Discussions  0 Replies 
[quote user="guy sergeant"]The load lines are horrible. I can't imagine it gives a very accurate representation of what is fed into it. Maybe that's not what you are after.[/quote]It is not that I completely agree (or completely understand) the Eduar...

Read the Post in new Window Read the Post in Threaded view  Post #13: pike with a double twist (6c33 dive) by hagtech on 2007-01-08 
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 
Sadly I have never spent the time to try and correlate the sonics of a tube with the trace characteristics.  Ok, sometimes it is obvious.  A flat line is a dead tube.  Normally I measure and compare both sections of dual triodes. ...

Read the Post in new Window Read the Post in Threaded view  Post #56: The BS about the “matched pairs” of NOS. by Romy the Cat on 2009-11-13 
Browse the content of the threads in new Window  Thread: The LCR RIAA correctors in Analog Playback  57 Replies 
I do not know here to start. I absolutely assertively insist that under normal circumstances it is absolutely imposable to buy matched pairs of NOS tubes, particularly the high Mu tubes. When sellers advertised the “matched pairs” I just discard the ...

Read the Post in new Window Read the Post in Threaded view  Post #364: Ho to use the YO186 by Romy the Cat on 2009-09-05 
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"]I have to admit that I have written a few pieces of writing about my experiences with YO186 but I withhold to post it as I do not know if it might valuable for anybody. It looks like no one use YO186 on West. There are ...

Read the Post in new Window Read the Post in Threaded view  Post #22: Thoughts on production by jessie.dazzle on 2008-05-23 
Browse the content of the threads in new Window  Thread: Purist Audio Design vs. Purist Audio Design in Audio Discussions  25 Replies 
Just thinking about it, it seems that in order for the sealant (silicone?) to adhere to the inner wall of the tube, the sealant would have to be applied to a tube that has not been in contact with the damping fluid, especially if that fluid is petrol...

Read the Post in new Window Read the Post in Threaded view  Post #39: The expressed perfect operation point is a fiction in a way. by Romy the Cat on 2010-11-03 
Browse the content of the threads in new Window  Thread: To drive the 6C33C... in Melquiades Amplifier  65 Replies 
[quote user="N-set"]Risking that the topic has already been discussed and that I postin a wrong category (Romy feel free to (re)move this post:Is there any sense in trying 6C33 at higher volatges and lower currents?More precisely, I've been wondering...

Read the Post in new Window Read the Post in Threaded view  Post #375: "Absolution and Eternal Refuge." by Romy the Cat on 2009-11-29 
Browse the content of the threads in new Window  Thread: Single-stage Melquiades vs. DHT amps in Melquiades Amplifier  397 Replies 
The name of the post I took from the 32th  chapter of M. Bulgakov’s Master and Margarita, so from there will be the epigraph for this post: “Gods, my gods! How sad the earth is at evening! How mysterious are the fogs over the swamps! …So...

Read the Post in new Window Read the Post in Threaded view  Post #3: Tubes Sound vs. Sound of Tubes by Romy the Cat on 2011-05-09 
Browse the content of the threads in new Window  Thread: Getting more power from SET vs. properly distorting SS. in Audio Discussions  4 Replies 
[quote user="Paul S"]While you are merely being empirical, there are actually plenty of devices that aim to "benefit" the end sound of SS gain by using tubes to "condition" the signal from DACs, etc.  Also, there are plenty of commercial widgets ...

Read the Post in new Window Read the Post in Threaded view  Post #133: Memory Fades Like the Afternoon Sun... by Paul S on 2009-11-02 
Browse the content of the threads in new Window  Thread: Initial thoughts about new/old Lamm ML2s in Audio Discussions  215 Replies 
[quote user="Romy the Cat"] Reading at my site Paul’s narrative about his fight with ML2’s tube and the ML2’s tube sockets I need to confess that I always was suspecting that he is some kind of odd wacko with bizarre and sick approach to the subject...

Read the Post in new Window Read the Post in Threaded view  Post #3: Uncomfortably comfortable tube testers by Romy the Cat on 2007-01-07 
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 
I do not know, you have to decide to yourself what kind tubes and the most important HOW you would like to test them. For different tubes, differently used the different things are important.  I had a few testers and all of them were OK but all ...

Read the Post in new Window Read the Post in Threaded view  Post #5: Well, it's your unit, why do you think “they” care? by Romy the Cat on 2007-01-07 
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 
Perhaps you are right. Buying out tubes from manufacture is a secure way to go. Still, I abandoned this practice in 2002 when Lamm sold me a pair of 12AX3 for his L2. When I got them one of the tubes was with paces of metal riddling inside. I figure ...

Read the Post in new Window Read the Post in Threaded view  Post #225: Call me Pussy. by Romy the Cat on 2010-10-13 
Browse the content of the threads in new Window  Thread: Romy The Cat's new Listening Room in Audio Discussions  478 Replies 
[quote user="unicon"] Roman, It is interesting to see you using your pipe in room.You mentioned its wrong to use them as LF consumer. You got it somehow wrong1-sealed tube traps can absorb LF and yet again absorb all HF in the same time...2- the ...

Read the Post in new Window Read the Post in Threaded view  Post #3: 7788 - love the tube! by Romy the Cat on 2006-02-14 
Browse the content of the threads in new Window  Thread: 7788 tube mic pre design in Analog Playback  38 Replies 
[quote user="rafaroxlm"]As you may know the 7788 is a high transconductance pentode which should in theory be able to give higher audio resolution than say 12AX7, 6072 tubes in tube mic pre designs.  On search here the 7788 was mention...

Read the Post in new Window Read the Post in Threaded view  Post #3: Another 6C33C amp.... by Romy the Cat 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 
[quote user="KOTriode"] The Melquiades give me inspiration to build this 6C33C amplifier. It's on a stereo chassis that has few unique features - Vacuum tube rectifier separately for Input/Driver and Output tubes. - Regulator using the same tube ...
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