BK 707 Tube Tester Mods - diyAudio
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Old 24th July 2012, 09:17 PM   #1
mbeards is offline mbeards  United States
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Join Date: Mar 2012
Default BK 707 Tube Tester Mods

I have a Bk 707 that works pretty well. Planning on going through the calibration process this evening after installing a SS rectifier.

I have heard of a simple mod to better test 12AX7's and while its all opened up, I am trying to think of other modifications for more comprehensive testing.

I plan on adding an ammeter to the common cathode circuit to "match tubes" or more correctly, get a better sense of performance and compare sections of twin triodes.

(I say "more correctly" since matching isn't quite possible at a static point.)

Are there any adverse affects of simply adding an analog ammeter inline with the cathodes? Also what is a good current range with this tester?

Also, this may be more trouble than its worth, but a headphone noise test would be pretty cool.

Any thoughts are greatly appreciated,

-Matt
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