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

Welsh Anorak · 2nd Nov 2017, 6:50 pm

Hi
I find it's best, especially with high-value resistors, to remove one leg in order to measure them, especially as you're using a digital meter. Not only does this remove any influence from other components, it also saves you inadvertently blowing up your meter with a charged capacitor!
How silent is it on the phono inputs? Try inputting your source that you're using for the other inputs. It should be far too loud and very distorted, of course. Do you get anything at all? The valves appear to be working to an extent so it might be a simple switching fault.
I wonder if the method of heater voltage supply is to compensate in some way for ageing of the output valves? Just a thought.
Glyn

2nd Nov 2017, 6:50 pm	#25
Welsh Anorak Dekatron Join Date: Apr 2005 Location: North Wales, UK. Posts: 6,927	Re: Looking for help please with 1964 Trio W-41 stereo valve amp Hi I find it's best, especially with high-value resistors, to remove one leg in order to measure them, especially as you're using a digital meter. Not only does this remove any influence from other components, it also saves you inadvertently blowing up your meter with a charged capacitor! How silent is it on the phono inputs? Try inputting your source that you're using for the other inputs. It should be far too loud and very distorted, of course. Do you get anything at all? The valves appear to be working to an extent so it might be a simple switching fault. I wonder if the method of heater voltage supply is to compensate in some way for ageing of the output valves? Just a thought. Glyn