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Also, earlier amps had 330R resistors which were later replaced with 470R to give the zeners an easier time. I usually replace the resistors if they're 330R and form the leads of a pair of new zeners to give them a 3/8" standoff from the board. As an upgrade I offer a pair of 15W metal clad resistors mounted on a heatsink connected back to the PCB with flying leads, though sometimes this is necessary anyhow if the board is well toasted.
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