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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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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. ...
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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...
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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...
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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 ...
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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...
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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...
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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...
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[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...
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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 ...
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[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 ...
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[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 ...
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[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...
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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 ...
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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...
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[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...
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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...
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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. ...
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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...
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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...
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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 ...
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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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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 ...
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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...
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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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[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 ...
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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...
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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...
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[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 ...
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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 ...
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That's one big tweeter, Romy, and, typically, it was made that big only because they intended for it to go low. I keep wondering about the effects of the extra mass, if nothing else, but also about dispersion and window blind effects ...
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