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In Reply to: DC offset dial at extreme on M60 MkII.2 posted by Zenjabil on September 29, 2005 at 11:36:17:
I have to disconnect the speaker cables to make offset or bias adjustments.
Ralph advised that it is sometimes required depending on the speakers used. Otherwise I would definitely check for tube problems. Also, if there is a switch for class A operation make sure it is in the A mode for setting offset.
Follow Ups:
This model only operates in Class A. I'm surprised to hear you advise disconnecting the amps from the speakers (and cables of course), since I was sure that the bia and offset setting were speaker dependent. I'll look into it. BTW, I use the atmas to drive a pair of Quad ESL 57s...a very copacetic match.
The problem is definitely the speakers. I drive esl's also and they create a problem biasing with the cables connected. Please try it without the cables connected and let me know how this works out. Also if you have a meter it may be more accurate. Attach it to the disconnected speaker terminal and set bias using the most sensitive setting.
Doc,The issue is definitely not with trhe speakers. I have switched the suspect amp from one Quad to the other with identical results. Also, as Lew points out, if the speaker type were at fault, the issue should also be reflected in the trouble free amp - which it is not. I used to own M-50s before the current M60 MkII.2s, and have the manual for that model lying around somewhere, and I could almost swear that the instructions call for biasing with the speaker in circuit. Anyway, haven't had any issues driving ESLs (63s or the 57s) with the Quads. I suspect the issue is very much related to a sub-optimal output tube. I will check and confirm later tonight.
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