UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Looking for help please with 1964 Trio W-41 stereo valve amp

Station X · 2nd Nov 2017, 1:12 pm

As I read the diagram, there should be no wiring to the centre tap (pin 9) of V1 or V2. Current flows:-

V1 pin 5- heater- V1 pin 4-V2 pin5-heater- V2 pin 4- ground.

Check the wiring and measure the voltages on pins 4 and 5 of both valves.

EDIT. Your voltage readings look OK to me, but I'm confused by the reference to a centre tap. Centre tap of what?

Check the continuity of the valve heaters (valves removed from amp) with your meter on ohms range. It's a nice easy and safe thing to do.

2nd Nov 2017, 1:12 pm	#2
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,288	Re: looking for help please with 1964 Trio W-41 stereo valve amp As I read the diagram, there should be no wiring to the centre tap (pin 9) of V1 or V2. Current flows:- V1 pin 5- heater- V1 pin 4-V2 pin5-heater- V2 pin 4- ground. Check the wiring and measure the voltages on pins 4 and 5 of both valves. EDIT. Your voltage readings look OK to me, but I'm confused by the reference to a centre tap. Centre tap of what? Check the continuity of the valve heaters (valves removed from amp) with your meter on ohms range. It's a nice easy and safe thing to do. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.