Did you check those two emitter resistors on the output, R66 and R51? They should be 0.33 Ohm. What is the bias current with no signal?
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Show posts MenuQuote from: Bajaguy on July 28, 2014, 11:40:20 AM
One thing to keep in mind when you are matching a preamp to a chip amp is matching the input impedance of the chip and the output impedance of the preamp. Not paying attention to this will cause some nasty oscillations...... ask me how I know. :grr
Quote from: JHow on May 14, 2014, 04:32:09 PM
I have a 1983 Randall rg80/100 es. I can take some shots tonight if that helps. The heat sink is as JMF described, the whole chassis itself. It's very thick aluminum.