UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - My first foray into Old model TV repairs. Ferguson 991T.

AdrianH · 29th Sep 2020, 12:51 pm

OK thank you John

I must admit to be very surprised at what current you and others are saying to pass through the coil, I would have thought that amount of current would be a lot higher then normal operational limits and had a risk of burning out the wire,but I will do so. I can use the buck converter to give me the required voltages.

I have spent a bit of time getting the AVO 8 to work again and just measured the grid, pin 2 of the PL81 and had -34 Volts with the Avo and -37 Volts with the DVM. So I is that being driven enough or not enough?

I also measured the Line frequency again using pin2 of PL81 and got 6.5 KHz when warm, which I think could be a little to low, but will wait until I remove a smoking capacitor I have just seen before measuring again.

Thanks for the pics.

Adrian

29th Sep 2020, 12:51 pm	#43
AdrianH Octode Join Date: Mar 2020 Location: Blackburn with Darwen, Lancashire, UK. Posts: 1,572	Re: My first foray into Old model TV repairs. OK thank you John I must admit to be very surprised at what current you and others are saying to pass through the coil, I would have thought that amount of current would be a lot higher then normal operational limits and had a risk of burning out the wire,but I will do so. I can use the buck converter to give me the required voltages. I have spent a bit of time getting the AVO 8 to work again and just measured the grid, pin 2 of the PL81 and had -34 Volts with the Avo and -37 Volts with the DVM. So I is that being driven enough or not enough? I also measured the Line frequency again using pin2 of PL81 and got 6.5 KHz when warm, which I think could be a little to low, but will wait until I remove a smoking capacitor I have just seen before measuring again. Thanks for the pics. Adrian __________________ Asking questions and learning, or trying to! Youtube EF91Valve