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Read the Post in new Window Read the Post in Threaded view  Post #26: Re: a lightly a different subject: OTL by morricab on 2005-11-04 
Browse the content of the threads in new Window  Thread: Passive transformer based preamp in Audio Discussions  41 Replies 
I do have a speaker with a flat impedance.  It is an Apogee Caliper Signature with an impedance variation from 3 to about 4.5 ohms over the whole range.  Fortuneately it is not so dead as your example as it has about 86db sensitivity. ...

Read the Post in new Window Read the Post in Threaded view  Post #8: OTL for fun and profit by Paul S on 2007-07-13 
Browse the content of the threads in new Window  Thread: Compression drivers and the “clean signal”. in Horn-Loaded Speakers  14 Replies 
I haven't given it a lot of thought other than to note the irony that there are quite a few dedicated OTL people who use autoformers ahead of their speakers.  In fact, I think there is fairly brisk underground traffic in autoformers for this use...

Read the Post in new Window Read the Post in Threaded view  Post #10: OTL for S2 by cv on 2007-07-14 
Browse the content of the threads in new Window  Thread: Compression drivers and the “clean signal”. in Horn-Loaded Speakers  14 Replies 
AlloWell this could be very interesting.... the Melq driver (at lower voltage) direct coupled to a 6C33 cathode follower run at low voltage, high current. Vincent looks like he's running about 80V 500mA, though in this case you'd need to use a r...

Read the Post in new Window Read the Post in Threaded view  Post #46: OTL electrostat amplifier by deemon on 2010-11-03 
Browse the content of the threads in new Window  Thread: To drive the 6C33C... in Melquiades Amplifier  65 Replies 
Yes , I told Romy about this funny idea , which is quite simple of course - to make a simple SRPP stage on special hi-voltage tubes , powered with high voltage supply ( 10000 V , for example ) and drive the electrostat panel directly from the output ...

Read the Post in new Window Read the Post in Threaded view  Post #2: Maybe a good single ended OTL amps? by morricab on 2007-11-16 
Browse the content of the threads in new Window  Thread: More power from Melquiades? More powerful tube? in Melquiades Amplifier  19 Replies 
Hi Romy, Have you ever thought of trying to build or have built for you a SE OTL?  You know that there is one on the market from the company transcendent sound using multiple 6C19PI output triodes?  Perhaps a few of these 12C42C tubes would...

Read the Post in new Window Read the Post in Threaded view  Post #23: a lightly a different subject: OTL by Romy the Cat on 2005-11-04 
Browse the content of the threads in new Window  Thread: Passive transformer based preamp in Audio Discussions  41 Replies 
I know about the transformers much less then you might imagine. I know if they work of not but why they do or do not do so I have no idea. Some people believe that they do know, I feel that many of then have in fact no really idea as well. Transforme...

Read the Post in new Window Read the Post in Threaded view  Post #23: a lightly a different subject: OTL by Romy the Cat on 2005-11-04 
Browse the content of the threads in new Window  Thread: Passive transformer based preamp in Audio Discussions  41 Replies 
I know about the transformers much less then you might imagine. I know if they work of not but why they do or do not do so I have no idea. Some people believe that they do know, I feel that many of then have in fact no really idea as well. Transforme...

Read the Post in new Window Read the Post in Threaded view  Post #12: Transformers and me by Paul S on 2007-09-24 
Browse the content of the threads in new Window  Thread: Devid Berning amplifiers: the anti-trnsformers frenzy? in Audio Discussions  45 Replies 
Thanks for the tech info, Merlin; it helps a lot, especially combined with the preferred music revelation, up the thread.I agree that the OPT figures in to the sound, all right, for better or for worse, and there is no mistaking the OTL "clarity" by ...

Read the Post in new Window Read the Post in Threaded view  Post #5: Please do not mention the OTLs…. by Romy the Cat on 2007-09-23 
Browse the content of the threads in new Window  Thread: A DSET is better then an expensive SET in Audio For Dummies ™  41 Replies 
[quote user="Merlin"]My SET doesn't have an output transformer. Just four tubes direct coupled. Bandwidth at full power is 2hz to 35khz.[/quote] Well, your SET might be able to bypass fundamentals from 2hz to 35khz but unfortunately it is all the OTL...

Read the Post in new Window Read the Post in Threaded view  Post #8: Keep hallucinationing :-) by Romy the Cat on 2007-09-23 
Browse the content of the threads in new Window  Thread: A DSET is better then an expensive SET in Audio For Dummies ™  41 Replies 
[quote user="Merlin"]No. You are wrong. Harmonically, my SET is quite superb using either 300b or 811 I have unfettered access to the music in it's entirety. Transformer cores just distort the signal.  [/quote] Well, I do not want to argue the ...

Read the Post in new Window Read the Post in Threaded view  Post #28: Re: Kill me, kill me, kill me!!!! by Romy the Cat on 2005-11-04 
Browse the content of the threads in new Window  Thread: Passive transformer based preamp in Audio Discussions  41 Replies 
[quote user="morricab"]I do have a speaker with a flat impedance.  It is an Apogee Caliper Signature with an impedance variation from 3 to about 4.5 ohms over the whole range.  Fortuneately it is not so dead as your example as it has about ...

Read the Post in new Window Read the Post in Threaded view  Post #9: D-OTL vs. Kopi Luwak Coffee? How you do, Vincent? by Romy the Cat on 2007-07-14 
Browse the content of the threads in new Window  Thread: Compression drivers and the “clean signal”. in Horn-Loaded Speakers  14 Replies 
[quote user="Paul S"]Now I am wondering:  If we go to such trouble to have transformers wound for our particular applications, maybe we could just as well be winding our narrow band voice coils and welding them to our/their own output tubes.[/qu...

Read the Post in new Window Read the Post in Threaded view  Post #21: Re: autoformers and OTLs .... by morricab on 2005-11-04 
Browse the content of the threads in new Window  Thread: Passive transformer based preamp in Audio Discussions  41 Replies 
Hi Romy,Not sure exactly what you mean by SET-minded speakers.  Please elaborate on that issue.  I don't quite see what about your horns would make an OTL perform any worse than a SET.  What I proposed to you, the concept of a OTL SET ...

Read the Post in new Window Read the Post in Threaded view  Post #2: Maybe a good single ended OTL amps? by morricab on 2007-11-16 
Browse the content of the threads in new Window  Thread: More power from Melquiades? More powerful tube? in Melquiades Amplifier  19 Replies 
Hi Romy, Have you ever thought of trying to build or have built for you a SE OTL?  You know that there is one on the market from the company transcendent sound using multiple 6C19PI output triodes?  Perhaps a few of these 12C42C tubes would...

Read the Post in new Window Read the Post in Threaded view  Post #9: D-OTL vs. Kopi Luwak Coffee? How you do, Vincent? by Romy the Cat on 2007-07-14 
Browse the content of the threads in new Window  Thread: Compression drivers and the “clean signal”. in Horn-Loaded Speakers  14 Replies 
[quote user="Paul S"]Now I am wondering:  If we go to such trouble to have transformers wound for our particular applications, maybe we could just as well be winding our narrow band voice coils and welding them to our/their own output tubes.[/qu...

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 #26: Re: a lightly a different subject: OTL by morricab on 2005-11-04 
Browse the content of the threads in new Window  Thread: Passive transformer based preamp in Audio Discussions  41 Replies 
I do have a speaker with a flat impedance.  It is an Apogee Caliper Signature with an impedance variation from 3 to about 4.5 ohms over the whole range.  Fortuneately it is not so dead as your example as it has about 86db sensitivity. ...

Read the Post in new Window Read the Post in Threaded view  Post #29: The transformer-less Masonic secretive handshake... by Romy the Cat on 2007-09-26 
Browse the content of the threads in new Window  Thread: Devid Berning amplifiers: the anti-trnsformers frenzy? in Audio Discussions  45 Replies 
Meriln, this is one of the subjects that disturbs me in your description: your bring OTL consciousness to justify Berning and you bring all those foolish OTL people as witnesses to give credentials to Berning. We all know Doctor Gizmo and all know hi...

Read the Post in new Window Read the Post in Threaded view  Post #25: Re: Better among worst? by morricab on 2005-11-04 
Browse the content of the threads in new Window  Thread: Passive transformer based preamp in Audio Discussions  41 Replies 
Hi, Thanks for the info about transformers.  It is as I expected, however, that these passive devices are not passive sonically at all. I agree with you that the higher quality of the transformers should lessen the effects I noted (if not elimi...

Read the Post in new Window Read the Post in Threaded view  Post #3: An amp with 64 x 6C19P tubes? by Romy the Cat on 2007-11-16 
Browse the content of the threads in new Window  Thread: More power from Melquiades? More powerful tube? in Melquiades Amplifier  19 Replies 
Nope, I am not a big friend of OTL amps generally… BTW, I have seen (did not heard) one Japanese amp that use 64 x 6C19P tubes. For whatever reasons Russians consider that 6C19P as very good sounding tube - the younger sister of 6C33C. It was not my ...

Read the Post in new Window Read the Post in Threaded view  Post #27: Re: Better among worst? by Thorsten on 2005-11-04 
Browse the content of the threads in new Window  Thread: Passive transformer based preamp in Audio Discussions  41 Replies 
Hi,[quote user="morricab"]Thanks for the info about transformers.  It is as I expected, however, that these passive devices are not passive sonically at all. I agree with you that the higher quality of the transformers should lessen the effects ...

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 #17: Other amps for other HF ribbons by Paul S on 2007-02-21 
Browse the content of the threads in new Window  Thread: RAAL “Water Drop” tweeter for Macondo. in Horn-Loaded Speakers  77 Replies 
I have tried both SS and tubed PP with HF ribbons, but not until ML2s have I gotten the "calm HF" I wanted from the ribbons.  I am still experimenting with the Audaphons, but they seem to do best from 4 Ohm tap.  My little 2A3 SETs did...

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 #40: You are not lucky with them. by Romy the Cat 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 
[quote user="KOTriode"]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 ...

Read the Post in new Window Read the Post in Threaded view  Post #18: Re: Better among worst? by morricab on 2005-11-04 
Browse the content of the threads in new Window  Thread: Passive transformer based preamp in Audio Discussions  41 Replies 
Hi Romy, I just want to add my experience I had last year with a transformer based (actually it was an autoformer based) "passive" preamp.  I thought that this could be the final solution in my preamp quest.  Alas, it was not the case.&nbs...

Read the Post in new Window Read the Post in Threaded view  Post #20: Re: Better among worst? by Thorsten on 2005-11-04 
Browse the content of the threads in new Window  Thread: Passive transformer based preamp in Audio Discussions  41 Replies 
Hi,[quote user="morricab"]the unit I tried (the Sonic Euphoria passive) did not live up to my hopes.[/quote] Given my somewhat loose but existing ties with S&B and with Music First Audio I need to be careful what I am saying. But let me suggest...

Read the Post in new Window Read the Post in Threaded view  Post #27: Circuit. by Merlin on 2007-09-25 
Browse the content of the threads in new Window  Thread: Devid Berning amplifiers: the anti-trnsformers frenzy? in Audio Discussions  45 Replies 
[quote user="drdna"][quote user="Romy the Cat"]David got rid of transformer and replaced it with a DC transformer, claiming that it is “better”.[/quote] And I should point out that not only is there still a transformer in the circuit, but many other ...

Read the Post in new Window Read the Post in Threaded view  Post #38: IMO the Berning sounds like nice PP with some well done feedback by Paul S on 2007-10-02 
Browse the content of the threads in new Window  Thread: Devid Berning amplifiers: the anti-trnsformers frenzy? in Audio Discussions  45 Replies 
And I do not mean this as a criticism.I had for some time an "original" Music Reference RM9, which was made by another well-educated genius, Roger Modjeski.  The RM9 was AB PP with adjustable bias and feedback/gain, with 6DJ8 drivers and a ...

Read the Post in new Window Read the Post in Threaded view  Post #16: Re: The same Korean company? by morricab on 2005-09-09 
Browse the content of the threads in new Window  Thread: Gas voltage reference 0A2 tubes. in Melquiades Amplifier  42 Replies 
Yep the same company (they also make a VERY good sounding OTL using the 6C33C tube).  I have heard that zillion tube amp and it is also quite good (but I thought the 6C33C amps captured the "correct" tone better).  You should try to hear th...
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