I bought an Audio Research D120 with a broken driver card -- this used some LSI devices -- sold the driver card on EBay -- and recouped a nice portion of the cost of the amplifier. Well, I am finally getting around to dressing it up with an LM4702 Driver Chip and some Sanken transistors:
Will probably use some mu-Metal shielding for the transformer.
There's 60mF per rail courtesy of Audio Research.
An externally hosted image should be here but it was not working when we last tested it.
Will probably use some mu-Metal shielding for the transformer.
There's 60mF per rail courtesy of Audio Research.
An externally hosted image should be here but it was not working when we last tested it.
After working over the power supply I now have an appreciation for why the previous owner gave it the "heave-ho" (the broken driver card was probably the last straw) -- there was a cold solder connection from the power transformer to the positive 60,000uF filter cap -- it actually wiggled.
I thought all those little old ladies in Minnesota knew how to solder.
I thought all those little old ladies in Minnesota knew how to solder.
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