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Old 18th June 2012, 04:06 PM   #1
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Default CounterPoint SA-12

I have a CounterPoint SA-12 that I just repaired but can not find the correct BIAS current setting for the outputs (orginal MOSFET). Can anyone help with this setting.
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Old 6th August 2012, 08:52 PM   #2
VivaVee is offline VivaVee  New Zealand
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Quote:
Originally Posted by embrown057 View Post
I have a CounterPoint SA-12 that I just repaired but can not find the correct BIAS current setting for the outputs (orginal MOSFET). Can anyone help with this setting.
According to the manual, the output pair should run at 450 to 500 mA quiescent. This can be measured by inserting a 1R0 resistor into the fuseholder and measuring 0.45-0.5V across the resistor. The amp should be running for 2-4 hours at the normal ambient temperature before the final settting is made. You may need to adjust the dc offset as well.

You may consider a lower quiescent current in the interest of preserving the ageing components in your amplifier.

Alan
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Old 6th August 2012, 09:57 PM   #3
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That repair is long gone and the customer is very happy. I found the info you stated awhile back but thanks for the responce. I set the BIAS at 450ma and found no differnace in crossover distorshion. Thanks' again.
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