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Old 14th December 2009, 07:01 PM   #1
John C is offline John C  United Kingdom
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Default X250 DC Offset & Bias Question


I have just purchased a pre-owned Pass Labs X250. Superb amplifier.

I would like to be able to check/adjust the DC Offset and the Bias... The front panel meter is at the 1-00pm position under no signal conditions. The heatsinks are at 39C in an ambient of 20C. LH one is 2C hotter....

Under normal listening conditions the meter is peaking around 80% to 90% of FSD. When I wind it up, the meter is 100%+++ FSD

It's driving a pair of Apogee Duetta Signature full range ribbons.

Does anyone have any info on setting the DC Offset and the Bias?? Is there any meter calibration too??

Thanks for any help...

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Old 15th December 2009, 12:39 AM   #2
eyoung is offline eyoung  United States
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Location: Sunny SC,USA 15 min south of Charlotte NC

Or one the siblings should answer, or a possible owner of said unit with experience in these matters.

Sand on fire, Elwood
"Lead me not into temptation...I can find it myself."
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