08-24-2017, 08:55 PM
Yes, this Marantz uses four M8513A-O varistor diodes in parallel with each bias trimpot. They all tested good (out of circuit) with the diode test of my DMM.
Since the bias on the right channel was initially so high, I made initial adjustments to both right channel trimpots to get the bias down. Then, I waited the requisite 30 minutes to let the unit fully warm up, and then made the final adjustments.
Since the bias on the right channel was initially so high, I made initial adjustments to both right channel trimpots to get the bias down. Then, I waited the requisite 30 minutes to let the unit fully warm up, and then made the final adjustments.
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Ron Ramirez
Ferdinand IN
