UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Trio W-38 servicing process

Station X · 18th Aug 2010, 7:33 pm

Looking at the schematic I can see that V12 and V13, which I assume are the non-lighting valves aren't fed from the mains transformer like the other valves. They are in fact connected in parallel with the common cathode resistor (R309) of the output valves.

As previously suggested check the heaters for continuity with a meter on ohms range. (pins 4 and 5). If this is OK turn your attention to checking voltage readings round the output valves, particularly the cathode voltage.

18th Aug 2010, 7:33 pm	#8
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,289	Re: Trio W-38 servicing process Looking at the schematic I can see that V12 and V13, which I assume are the non-lighting valves aren't fed from the mains transformer like the other valves. They are in fact connected in parallel with the common cathode resistor (R309) of the output valves. As previously suggested check the heaters for continuity with a meter on ohms range. (pins 4 and 5). If this is OK turn your attention to checking voltage readings round the output valves, particularly the cathode voltage. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.