UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Trying to revive a Goodmans One Ten receiver

jjl · 30th Sep 2020, 11:43 am

If the scale lamps PL2, 3, and 4 are lit, at least the mains fuse is intact. I can't find where these lamps take power from in the service manual, but given that they are 12V types they are probably powered from the +14.3V or -14.3V rail. In which case these supplies must be present.
I'd check the fuses in the +35V and -35V rails to the power amplifiers. Don't be tempted to just replace these if they are blown as they will have failed for a reason - most likely failure of output transistors for either power supply variant or rectifier diodes or smoothing capacitors for the earlier variant.

John

30th Sep 2020, 11:43 am	#4
jjl Octode Join Date: Jan 2003 Location: Ware, Herts. UK. Posts: 1,082	Re: Trying to revive a Goodmans One Ten reciever If the scale lamps PL2, 3, and 4 are lit, at least the mains fuse is intact. I can't find where these lamps take power from in the service manual, but given that they are 12V types they are probably powered from the +14.3V or -14.3V rail. In which case these supplies must be present. I'd check the fuses in the +35V and -35V rails to the power amplifiers. Don't be tempted to just replace these if they are blown as they will have failed for a reason - most likely failure of output transistors for either power supply variant or rectifier diodes or smoothing capacitors for the earlier variant. John