>
>> > measures writes ...
>> >
>> > Ä A rheostat to adj. fil/heater potential costs under five dollars
>> > wholesale. Do any MFJ-Ameritron amps have one? Would people pay a bit
>> > extra for such a feature?
>> >
>>
>> To be effective the filament rheostat would require built-in metering with
>> proper RF decoupling at considerably more cost or would encourage
>> semi-trained appliance operators to operate their amplifiers in a very
>> unsafe manner (covers off, power on) in order to set the filament voltage
>> properly.
>
>
>Hi Joe,
>
>Right you are, but you left off the cost of a separate transformer
>that has only filament functions.
The lowly SB-220 has a separate filament-transformer.
>
>What Rich left off was that all of the amplifiers have multiple
>filament taps that allow adjustment for high and low line voltages.
>
Is there a switch to select the filament tap, or muct the amplifier be
disassembled to change taps.?
thanks, Tom.
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