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, 5:49 pm

Perhaps a silly question,, but were these readings taken with the amp powered off? They should be.

You should be able to get steady readings on R3 and R103 (270k), as these components are not shunted.

R5 and R105 are shunted by what appears to be a feedback loop, so may give incorrect readings.

Varying readings indicate that the meter is charging up capacitors in the circuit, but they should stabilise if you wait long enough.

2nd Nov 2017, 5:49 pm	#20
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 Perhaps a silly question,, but were these readings taken with the amp powered off? They should be. You should be able to get steady readings on R3 and R103 (270k), as these components are not shunted. R5 and R105 are shunted by what appears to be a feedback loop, so may give incorrect readings. Varying readings indicate that the meter is charging up capacitors in the circuit, but they should stabilise if you wait long enough. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.