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Old 3rd February 2010, 02:54 PM   #1
randu is offline randu  United States
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Location: Berkley, MI
Post Biasing a solid state amp


I am looking for some help and advice.

While knowledgeable on "everything," but involved techinal matters, I have a ?

My 2 yr old ss amp, according to the dealer, needs to be re-biased for a second time.

I am being vague about the brand so as not to offend/cast aspersions before I know what I don't know.

He provides limited instruction--120lbs does not afford shipping for this adjustment--and is basically not supportive for reasons I won't delve into online.

Having owned other "high end" ss amps and never had to do anything w/the bias, why is this amp having this issue?

Anyone who can help me understand this/what's going on would be appreciated.

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Old 3rd February 2010, 03:44 PM   #2
cbdb is offline cbdb  Canada
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Something dosnt seem right that you have to do this adjustment that often (a bad pot?).

You will need to know the location of the bias adjust pot (you might be able to find it without a schematic). You will also need to know the optimal bias current, this usually comes from the service manual. (can you find this number?)

Doing this yourself will probably void the warranty (if it still matters).
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Old 3rd February 2010, 03:55 PM   #3
h_a is offline h_a  Europe
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No need to readjust if the amp is fine - only if parts had to be replaced.

Have fun, Hannes

PS: except tube gear, but you said already it's solid state.
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Old 3rd February 2010, 06:16 PM   #4
randu is offline randu  United States
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Thanks to Hannes/Cbdb:

For a Class A, it runs too cool--the case is hardly warm. When it first arrived from Germany, it ran too hot, prompting my call to the dealer.

It is likely since I am a bit of a klutz/was "afraid" of the adjusting process that I muffed the job.

After the first adj. the sound and temp. were better, now....

The dealer guides me to the correct settings for optimal bias. I have the hood open and see the pot.


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