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Disconnecting everything showed that +12, -12, +5 were all fine, until I put load on the +5V line. Even 200mA dropped it to 200mV.
Part numbers in that power supply:
Q1, Q2 | M552 4-433 | Hfe=43, Hfe=29 |
Q3 | 2N3053 | |
U1 case | 1826-0147 7812 | |
U2 case | 1826-0221 7912 | |
U1, U2 brd | uA723 | Voltage regulator |
The current sensing resistors seemed fine at 0.5ohm.