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

peter_sol · 27th Jan 2006, 3:02 pm

Hi
refering back to an earlier comment
Are you sure thet the output transformer is the correct ratio as I think the ECL80 requires 11k which is higher than most other valves

Also is it stable with no input signal if you disconnect the coupling capacitor from the pentode grid?
This may help to isolate the problem.

Regards

Peter.

27th Jan 2006, 3:02 pm	#36
peter_sol Octode Join Date: Aug 2003 Location: Welwyn Garden City, Herts. UK. Posts: 1,906	Re: Motorboating Hi refering back to an earlier comment Are you sure thet the output transformer is the correct ratio as I think the ECL80 requires 11k which is higher than most other valves Also is it stable with no input signal if you disconnect the coupling capacitor from the pentode grid? This may help to isolate the problem. Regards Peter.