Rob Atkinson wrote:
> I'm having a hard time believing 3-500 filaments are stressed all that
> much. I'd be more interested in metering the fil. voltage and being
> able to adjust it. I know of no commercially manufactured ham amps
> that meter the filament v. To me that is the amp/transmitter
> equivalent of an oil pressure gauge in a motor vehicle, also something
> you never see in mass market consumer vehicles.
> I would not put the all the AC service through an on/off switch for an
> amp. I'd use the switch for the AC to a 28 v. relay coil DC supply
> and use relays for the higher current on/off to the h.v. etc.
> primaries.
Most commercial broadcast transmitters monitor the current through tube
filaments and possibly
the Voltage. The current is much better because it can't be wrong at the tube
like the Voltage can.
As connections become resistive (bolted connections etc.) maintaining the
original current will
insure a cathode at the right temperature. The correct current depend on the
particular tube or
tubes. Set the correct Voltage at the tube filament connection when installed
then record the current.
--
73 Ron KA4INM - All E-mail sent to this address shall linger in the Google
cloud forever!
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