SRS153s.

[G3RHZ]

Solartron used decent tfmr's and components in their power supply's. The one in my AC meter used Partridge chokes and a Gresham mains tfmr as well as TCC paper in oil caps, all tested ok, still, yours may have had a hard life. Give it a good visual going over, AFAIK there should be a Y cap in there, but couldn't swear to it. Some good quality pics would help.

Andy.