Hi All
Complaints to Northern States Power about line voltage
running high (currently 124volts, was 128 earlier) got the
comment that it is more efficient & we aren't going to
adjust it down. Light bulbs have a VERY short lifespan here
but most of the solid state stuff doesn't care, only have
filament voltage problems & I use a small variac for that.
Mark
Roy Koeppe wrote:
>
> 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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> >
>
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--
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Problems: owner-amps@contesting.com
Search: http://www.contesting.com/km9p/search.htm
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