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Good topic, I use a regulator (8V@3Amps)with a pass trasistor and 2 flat style diodes using a TO-220ac style case. Works decent and seems to do very well. Have Bob to thank for getting me interested in a biased amp some years back. Similar to motorola design with a few changes. I generally use 1 circuit per 2 transistors. I could use it for a 4 pill amp, but don't.