Bias on new Yaqin MS-30L - how often to check? - Biff

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Bias on new Yaqin MS-30L - how often to check?

Hi all -

I recently bought a Yaqin MS-30L integrated amp. It sounded nice right out of the box and then about two weeks later it went all grainy and harsh at the high end.

So, I checked the bias (which is easily checked and adjusted from the top of the unit) and each power tube (EL34b) was high by at least .05v. The correct value should be .45v.

I adjusted it back to .45v and it really smoothed things out.

Is this something I need to check periodically? Or just during break-in (if there is such a thing)?

Thank you.
Biff

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Topic - Bias on new Yaqin MS-30L - how often to check? - Biff 09:25:29 10/01/15 (7)

RE: Bias on new Yaqin MS-30L - how often to check? - Caucasian Blackplate 10:18:24 10/02/15 (1)

Seems stable since I posted this. - Biff 11:52:06 10/02/15 (0)

RE: Bias on new Yaqin MS-30L - how often to check? - DAK 13:34:20 10/01/15 (1)

Thanks much for the info. /nt - Biff 13:59:08 10/01/15 (0)

RE: Bias on new Yaqin MS-30L - how often to check? - mcgjohn@yahoo.com 09:49:00 10/01/15 (2)

Funny you mention that - Biff 09:52:31 10/01/15 (1)

RE: Funny you mention that - mcgjohn@yahoo.com 17:06:24 10/01/15 (0)

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