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Old 19th Feb 2010, 7:04 pm   #172
ahjohn002
Retired Dormant Member
 
Join Date: Feb 2010
Location: Hong Kong, China.
Posts: 5
Default Re: The "Sussex" Homebrew Valve Tester.

Hi, Mike,
Some questions that I hope you would care to give me some answers :
a. should the regulator keep the anode voltage at roughly the same value before and after a tube is inserted for testing
b. does the regulator eliminate most noise and ripple of the power supply that affect the accuracy of any measurement (if you have taken some measurements on noise and ripple, at what values could these be considered as acceptable?)
c. I read elsewhere that when measuring gm (transconductance), a sine wave signal should be applied to the grid. How do you supply that signal to the Sussex tester?
Thanks.
John
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