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OTL Asylum OTL, Output Transformerless Amplifier User Group. |
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In Reply to: Re: Is there a good set of plans for a good tube OTL amp posted by Dr. Philosophy on January 22, 2005 at 14:02:19:
Hi,> Thorsten, have you heard a Bruce Rozenblit OTL?
I heard a DIY one from his designs. It used EL509's.
> I would surprised if they did not sound different
> from other OTLs.I would be surprised if they did. They are a rather traditional implementation of an SEPP OTL output Stage with large amounts of overall feedback and many stages. The "novel" part is the way BR attemps to impbalance the drive signal to the output valves in order to compensate the different gain between the common cathode and common anode part of the output stage. An extensive discussion of the merits (or lack thereoff) of his solution can be found in the Tubecad Journal. Ignoring the different approaches to the Drive Signal Imbalance, the average Croft OTL and one designed by BR have more in common than they differ.
However, I reapeat, if you like what you got, good on you. Enjoy.
> He's also got a true single-ended one now.
That one I have not heard, if I find myself with too much time I'll probably build something similar (the basic design goes back to a 1950's Japanese design BTW).
Ciao T
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Follow Ups
- Re: Is there a good set of plans for a good tube OTL amp - Thorsten 03:35:32 01/23/05 (4)
- OTL VERSUS SET AND SET OTL - David Lawrence 08:18:25 01/28/05 (1)
- Re: OTL VERSUS SET AND SET OTL - Lew 10:27:34 01/31/05 (0)
- hmm..... - Dr. Philosophy 04:32:38 01/23/05 (1)
- Re: hmm..... - Thorsten 07:09:19 01/23/05 (0)
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