UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

Alf Fisher · 19th Jan 2018, 10:59 pm

Hi Martin (Dekatron),
I have just bought a set of boards from G8UWM and I have to say that they are beautifully made.

Do you have a component listing for your latest edition of the main board as shown in post #1456?

I like the idea of separate regulators for the 1.4 and 2 volt supplies. After a lot of use, I can see intermittent and noisy switch contacts could cause the 1.4 volts to jump up to 2 volts.
Have you considered running these regulators from the 4v or 5 volt tapping instead of the 12 volt one? I think it could reduce the power dissipation in the LM317 by quite a lot.

Alf

19th Jan 2018, 10:59 pm	#1466
Alf Fisher Hexode Join Date: Sep 2005 Location: Potton, Bedfordshire, UK. Posts: 293	Re: The "Sussex" Homebrew Valve Tester. Hi Martin (Dekatron), I have just bought a set of boards from G8UWM and I have to say that they are beautifully made. Do you have a component listing for your latest edition of the main board as shown in post #1456? I like the idea of separate regulators for the 1.4 and 2 volt supplies. After a lot of use, I can see intermittent and noisy switch contacts could cause the 1.4 volts to jump up to 2 volts. Have you considered running these regulators from the 4v or 5 volt tapping instead of the 12 volt one? I think it could reduce the power dissipation in the LM317 by quite a lot. Alf