Monty...
For gosh' sakes, contact your power company about that outrageously high
line voltage! They are supposed to keep it well within specified limits--not
nearly that high. They will come out and adjust it for you. (It must have
been coffee-shop time when they installed that polepig, and forgot to return
after the 1-hour break to adjust the tap). That much voltage can damage
other appliances as well as fils. Of course, maybe you like the boosted QRO
from the B+ increase?
73, K6XK
-----Original Message-----
From: Monty Taylor <montytaylor@texoma.net>
To: Amplifier Reflector <amps@contesting.com>
To: <amps@contesting.com>
Date: Sunday, January 31, 1999 8:06 AM
Subject: [AMPS] 3-500Z filament voltage
>
>I have just reduced my filament voltage on the 3-500Z's in my Linear from
>5.75 volts to 5.00 volts, added 40 ohms in the primary of the transformer,
>with no load or drive. If I drive the amp to 600ma, for example, what is
an
>acceptable voltage drop that could I expect and the ramifications of such a
>drop. The secondary filament leads are only six inches long and appear to
>be #10 or #8 stranded wire. The transformer previously supplied the current
>without getting warm. The reason for the high filament voltage is due to
>the 248 VAC furnished by the local electric utility. Helps my High Voltage
>Power supply though!!! I would appreciate any and all comments,
theoretical
>or experience.
>
>Monty/WB5GLB
>
>
>
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