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Re: Testing for shorts on a B&K 747 - how reliable?

64.253.163.66

Posted by lipmanl on January 8, 2007 at 12:01:43

In Reply to: Testing for shorts on a B&K 747 - how reliable? posted by kmcdonou on January 8, 2007 at 08:44:11:

I have a B&K 700 and also a 707, which operate the same way as yours. If the tube isn't misbehaving when tested, it won't test bad, and that's no "shortcoming" on the part of the tester. But why do you think it's a tube? Couldn't it be a capacitor or even some wires that are too close together or something like that?

As to your last question, generally you wouldn't want to use that tube but there are a couple of areas where you might get away with it. First, if the tube is used very conservatively (low voltage, low current) and is lightly loaded, it might still work well. Also, it might be ok in the IF strip of a tuner, where tubes (especially the limiter) act as switches (slam on, slam off).

Tube can be rejuvenated sometimes. There's a procedure to do this. It doesn't always work, and won't work at all if the tube is damaged, but you have nothing to lose by trying.

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