a) Power ON
b) In SSB receive mode measure the following by flipping the TRANS/REC SW.
- Driver tube pin 2 (REC = -15vdc, TRANS = 0vdc
- 8122 8,9 or 11 (REC = approx -70vdc, TRANS = -30vdc with the bias pot half way.
If these voltages are good, the BIAS/ALC board is OK. Q203 and the input diodes are OK and it's safe to try an 8122.