|
OTL Asylum OTL, Output Transformerless Amplifier User Group. |
|
|
|
OTL Asylum OTL, Output Transformerless Amplifier User Group. |
|
In Reply to: Re: Sound Labs posted by Roy on July 1, 2002 at 14:16:01:
It's quite likely that the new modification to the backplate as espoused by Sound Labs and Dr.West will be a superior cure for the "impedance problem" vs Kevin's earlier work. Indeed, one could start with the new hi-pass filter design and then apply Kevin's approach to make it even better. I don't know whether Kevin has incorporated the Sound Lab tweak yet or had a chance to make impedance vs frequency curves for the new circuit. The most effective cure for Kevin with the original circuit was finally bi-amplifying the speaker, one amp for each of the two audio transformers. Since my amps are huge, excellent, and not duplicatable (meaning I don't have the funds or the patience or the space to do it), I am reluctant to go THAT far. BTW, it's a little confusing to call the Sound Lab mod a "new backplate". It's really a modification of the hi-pass filter that precedes the toroidal treble transformer. By adding an inductor in parallel with the toroid and changing some resistor values, the amplifier sees a higher impedance at the x-over point. Nothing else changes. But by all accounts, this helps OTLs greatly to drive the mid-range. I am anxious to try it.
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- Re: Sound Labs - Lew 14:36:32 07/01/02 (9)
- Re: Sound Labs - Roy 01:34:39 07/02/02 (8)
- Re: Sound Labs - Lew 06:55:49 07/02/02 (7)
- Re: Sound Labs - Roy 13:39:52 07/02/02 (6)
- Re: Sound Labs - Lew 14:20:13 07/02/02 (5)
- Re: Sound Labs - Roy 16:13:56 07/02/02 (4)
- Re: Sound Labs - Lew 07:41:54 07/03/02 (3)
- Re: Sound Labs - Roy 16:48:25 07/03/02 (2)
- Re: Sound Labs - Lew 07:01:06 07/05/02 (1)
- Re:Sound Labs - Roy 15:08:05 07/05/02 (0)
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2025, Audio Asylum, all rights reserved ]
