HW-101 step 3

[Ed Richards]

John;
I see you mention testing tubes several times. I just want to caution you
not to depend too much on a tube-tester as it is, at best, only a
guesstiment. It cannot put all of the different voltages and frequencies
on a tube that it may operate under in actual service. It basically
measures it's gain under only one set of conditions. Generally, if a tube
tests bad it is bad, if it tests good you still don't know. The best test
is to substitute with a new tube and see if the circuit works better. In
50 years of radio repairing I have seen many tubes that test good,
outperformed by a new tube.

Regards,
Ed Richards



On Wed, 5 May 1999 20:06:11 -0600 "Clark, John" <john.clark at STATE.CO.US>
writes:
>All is well with my first modification.
>Replacement of R106 with a 33K 2 Watt.
>
>To make sure that all the tubs were well
>I did a test again of the 6AU6 tubes.
>The S meter is now stable on a dummy load
>but only after about 3 minutes.
>
>From the 1 to 3 minutes point there is about a 1 S movement.
>From .240 to .217 vdc on the center of zero adj.
>
>All well the ends well.
>
>73
>N0URE
>
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