Ampeg V-4

The spike protection diodes in this amp had shorted so it was blowing fuses.  Unfortunately, the 7027s were all bad, so I installed some SED 6L6GCs, which are electrically equivalent but not quite as tough.  I decreased the bias to reduce plate voltage as much as possible, and increased the value of the screen grid stoppers.

I also replaced the master volume (installed by a previous tech) with a post-phase-inverter type and installed new electrolytic capacitors.

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