please help 407a

tomthum · 5th October 2008, 12:07 AM

howdy,
I am new here, but hope someone can help me.
I have a 539c hickok tester, and can't find the data to test a 407a.
People have told me a few things and somone told me to test it as a 7370.
Although it seemed correct...I think the voltage was wrong.

Thanks for the help.

THe unltimate Toob Boob

mach1 · 5th October 2008, 01:51 AM

Same as for the 396a or 2C51, but up the filament voltage setting to around 20v.

5th October 2008, 12:07 AM	#1
tomthum diyAudio Member Join Date: Jan 2008	please help 407a howdy, I am new here, but hope someone can help me. I have a 539c hickok tester, and can't find the data to test a 407a. People have told me a few things and somone told me to test it as a 7370. Although it seemed correct...I think the voltage was wrong. Thanks for the help. THe unltimate Toob Boob

5th October 2008, 01:51 AM	#2
mach1 diyAudio Member Join Date: Sep 2004 Location: Brisvegas	Same as for the 396a or 2C51, but up the filament voltage setting to around 20v. __________________ Au rutti wop-bop-a-loom-bop-a-boom-bam-boom - Richard Penniman

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