luke9511
Well-known member
all i know is it looks old so i will leave it un solderedThat is the B+ voltage regulator. There are 4 voltage regulators that can be used in the chassis 3123, 3130, 30123 and 30130.
If it was not soldered, you need to make sure it was the correct one for that pcb configuration. There are some jumper links to change between the 4pin and 5 pin versions. There are jumpers on the schematic that show the correct jumper settings for each one.





