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Antique Radio Technical Forum
Tubes That Test High

Posted by Thomas Dermody on 04/05/2009 23:13

Then, since your tester has a bias control, your extremely good tests might be due to a change in grid spacing (due to production changes) instead of emissions? Could be either, regardless of the tester, but that is an interesting thing to keep in mind. I have had rectifiers that peg the meter, but that's only because of extremely good cathode emissions.

I wonder if manufacturers ever changed the gain of a tube (by changing grid spacing). I assume that they did.

T.



Tubes That Test High 
Bob Masse 04/05/2009 11:40 
Thomas Dermody 04/05/2009 14:31 
easyrider8 04/05/2009 18:22 
Bob Masse 04/05/2009 18:53 
Bob Masse 04/05/2009 21:11 
Thomas Dermody 04/05/2009 23:13 
It's All Relative 04/06/2009 00:05 
easyrider8 04/06/2009 02:27 
Why Bother? 04/06/2009 12:54 

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