Audio Research D115 meets the LM4702

jackinnj · 22nd March 2008, 05:15 PM

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.

jackinnj · 2nd April 2008, 09:36 PM

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.

22nd March 2008, 05:15 PM	#1
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	Audio Research D115 meets the LM4702 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.

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2nd April 2008, 09:36 PM	#2
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	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.