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Old 20th Feb 2010, 10:50 pm   #177
Top Cap
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Join Date: Mar 2006
Location: Watford, Hertfordshire, UK.
Posts: 1,165
Default Re: The "Sussex" Homebrew Valve Tester.

Originally Posted by ahjohn002 View Post
After a half wave rectifier: 324 vdc
The circuit was designed for full wave rectified input, would applying just half wave cause the problem?
Do you have the Drain of FET TR2 correctly supplied from the un-reg HT line?
Are R6 and R7 correctly connected in parallel and both 10 Ohms?
What voltage on the gate of TR2, if low then the limiter TR3 may be coming in early.
Whether the Top Cap is Grid or Anode - touching it will give you a buzz either way!
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