project one mark IV B

[supereagle]

Hi i got a new to me project one mark IV receiver and cannot find anything on dc and bias adjustment .I search all over for manual ,any help appreciated

 

[ryuuoh]

Bias pots tend to be near the output section of the driver board. DC balance will tend to be near the differential pair of transistors on the driver board input. This is on a basic class AB amp.

 

[supereagle]

appreciate the help i cannot find any specs on it either.

 

[supereagle]

Cannot find any manual on it,it sounds good just want to double check

 

[ryuuoh]

I would check the DC offset, and keep tabs on the heatsink's temperatures.
DC offset check:
http://audiokarma.org/forums/showthread.php?t=5634
For the bias, make sure the heatsinks aren't stone cold (under biased) or blazing hot (over biased) during normal listening.

 

[supereagle]

Thank you appreciate the help will check when i get home