On Sun, 31 Jan 1999 07:59:22 -0600 "Monty Taylor"
<montytaylor@texoma.net> writes:
>
>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.
With a stiff 240V line the voltage drop caused by key down loading should
not exceed a few percent. You have up to 5% to play with with a minimum
of 4.75V. You can always adjust the resistor values to compensate but may
not be worth the effort unless you do a lot of key down operation such as
RTTY, etc.
GL Carl KM1H
Helps my High
>Voltage
>Power supply though!!! I would appreciate any and all comments,
>theoretical
>or experience.
>
>Monty/WB5GLB
>
>
>
>--
>FAQ on WWW: http://www.contesting.com/ampfaq.html
>Submissions: amps@contesting.com
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>Problems: owner-amps@contesting.com
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>
>
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