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In Reply to: RE: Tube testers have gone nuts posted by Rod M on May 05, 2014 at 18:50:22
$300 but taking offers (shipping < $30)I have one, very pleased, and the nice thing for relative novice like me is that this link ... http://tubesound.com/2008/03/23/bk-707-tube-tester/ ... provided plenty info, including recapping/restoring instructions, and the fellow can provide a solid state replacement for the big rectifier tube (internal of course). I go it for mine so that leave only one internal tube to worry about (also got from him).
Never trust an Atom, they Make Up everything!
Edits: 05/06/14Follow Ups:
bjh, thanks so much for posting that tube sound link.
About 20 years ago I picked up a clean 707 at a swap meet. I contacted B&K and was able to buy both the manual and tube charts at that time. I went through the calibration steps without any difficulties.
I'm not knowledgeable on electronics but the 707 has served me well over the years for occasional basic testing. Due to the era of its design it does not test some older tubes such as 300Bs. But the QuickCheck function is great for a rube like me and it has covered 90%+ of my needs.
"You can’t know what the “best” is unless you have heard everything, and keep in mind that given individual tastes, there really isn’t any such thing." HP
I'll say thanks again bjh. I do have 12AX7s and 5751s I test but in my electronics ignorance didn't realize there was a problem. So I'll read and digest these suggestions and try my hand at an update. I probably should recap and recalibrate mine anyway. So as long as the hood is up let me adjust this little screw on the side of the carb! ;^)
* Count Basie
"You can’t know what the “best” is unless you have heard everything, and keep in mind that given individual tastes, there really isn’t any such thing." HP
A stock 707 has a rather compromised test for the popular (in audio) 12AX7 but the link documents a modification that addresses the issue. I did it, works like a charm!
12AX7 Test Modification For B&K 707
... now if only I could find a mod to allow a 6922 to test for mutual conductance; i.e. in the upper section, the lower section tests for emission and unfortunately that's where you test a 6DJ8/6922.
Never trust an Atom, they Make Up everything!
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