Kenwood bias information

Tweakers' Asylum

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Hi Gang,
I used to post here but I couldn't get in with my 'old' information, so I am back. I might be remembered as deafelectromark- my eBay name.
I have a Kenwood power amplifier Basic 2A that needs the bias adjusted. Some of the transistors were running hotter than others and I resolved most of the problem by re-soldering the .22 ohm twin bias measuring resistors onto the circuitboard. They were intermittent and the bias would go from 2-22mV on one of them and from 0 t0 44mV on the other. There are tiny trimmers near those resistors (VR3 and VR4) and on the outside board there are larger controls that are named VR1 and VR2.
The off set is only 45mV at start up and reduces close to 0mV when warmed up. The bias changes as it warms up, so I need to know what to set the voltage on the pins of those resistors to get the correct amount. And since there are 4 controls, I imagine the outer two are for DC offset?
Any help will be appreciated,
Mark
Music is subjective

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Kimber Kable

Topic - Kenwood bias information - manoteal 21:28:03 10/28/09 (2)

RE: Kenwood bias information - djk 23:49:40 10/28/09 (1)

RE: Kenwood bias information - manoteal 23:21:22 10/29/09 (0)

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