This Signal Corps audio amplifier was found at a hamfest. The unit was sold with just the 12AX7 tube. The others, a 5Y3 rectifier and the push/pull 6V6 pair, were missing. It was in very good cosmetic condition, just needing a cleaning.
Troubleshooting
I replaced the missing tubes and fuse and did a slow power up of the amp. It turned out to be in very good condition and not in need of repair other than the usual cleaning of the tube pins, volume pot and switches. The power connector was a military twist lock. I opted to replace it with a three prong IEC connector pulled from a defunct computer power supply. That conversion is easily reversible with no cosmetic changes.
A Signal Corps BC-1031-C Panoramic Adapter was the previous item on the bench.
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