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Old 27th Jun 2020, 9:26 pm   #41
Join Date: Nov 2018
Location: Freckleton, Lancashire, UK.
Posts: 112
Default Re: Yes, yet another home made valve tester.

Interesting design for a valve tester in the latest issue of Signal from VMARS.

Page 17, Uses an AC signal and relies on the 180 degree phase shift through the valve to measure gm directly.
Building and tinkering for over 50 years, from 807's to digital amateur TV.
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