Audio Research D-90

Hevac1,
Thanks for the help.I have the volt meter but I don't know witch socket holes to check,what the reading should be or how to ajust the bias if it need be.Thanks again,Bill

I am still looking for the info for you.
I should have it by the weekend.

Hevac1,
You must be having the same luck I've been having trying to find that info.A.R. do'es not seem to hospitable in giving info. Thank you for all your help.
If any one out there has a manual for a D-90 thay want to sell or make a copy of ,please let me know.Thank you,Bill

There is also an adjustment around the cross coupler 6FQ7's that needs to happen to set their operating points. That being said it is also possible that one or more capacitors on that channel need to be replaced. In which case given its age you might want to consider a total recap. G

I am having trouble finding the info for you.
I will try 1 other avenue this week.
The store I deal with is a dealer for ARC (DA).