Hi, I just bought a A.R.D-90 and there is a hum in the right channel.I reversed the inter-connects and still in the right side.I switched the 12ax7's for 12au7's and it got louder.Any ideas or insight? Bill
You need a meter that does A/C & DC voltage. Most any will work ever radio shack one. I think you can go to ARC's web site and either download or request the manual.
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
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
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