|
OTL Asylum OTL, Output Transformerless Amplifier User Group. |
|
|
|
OTL Asylum OTL, Output Transformerless Amplifier User Group. |
|
In Reply to: Hey man posted by Brian Walsh on December 29, 2004 at 13:57:55:
A few years ago someone sent us a pair of Fourier amps to see if we could repair them. The company had just recently folded, and we thought that it might be nice if we could offer service on the amps.What we found upon checking them out is confimation of Brian's assesment. Poor soldering, flimsy boards, underrated components (in particular, the Bindu filter caps from India, questionable on a good day and in this particular application, being operated 20-40 volts beyond their working voltage!).
All this in an amp circuit that is historically noted for instability. We concluded that it was not ethical to attempt a repair on the amps, as it would be a losing proposition to warranty the work.
Futterman amplifiers (the type of circuit which the Fourier amps use) are well known for instability. None of them are know to do well with 4 ohms. Follow Brian's advice and if you are using 4 ohm speakers, get a set of ZEROs and use them.
-Ralph
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- Re: If I can chime in.... - Ralph 14:19:26 12/29/04 (0)
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2024, Audio Asylum, all rights reserved ]
