No, not trivial to replace. The Corsair front panle has to be removed I
think. Pots and switches of the correct size and ratings are hard to
find. I remember years ago, Centralab had modular replacement parts. You
bought the pot, switch and shaft separately and it all snapped together.
Very clever. I would like to find a switch module that I could snap
onto the bcak of the Corsair RF gain pot. I think that the push-pull
switches that Ten-Tec used are not as robust as the conventional type.
By the way, did Ten-Tec use audio or linear taper pots for their volume
controls?
73,
Bob WB2VUF
On 1/2/2011 8:30 PM, Dr. Gerald N. Johnson wrote:
> I put a diode in series with the relay coil to make it an amplified
> polarity protector too. I also put a diode across the relay coil to
> squelch inductive kick.
>
> It was intended that the switch in the rigs controlled the power supply
> primary. Supposed to survive better that way. Same thing was planned in
> the Collins 32S transmitters and KWM-2 and those switches (looked like
> switches from a pot mounted on a rotary mode switch) also are known to
> fail. Its beginning to be a popular mod to add a power relay to the
> Collins AC supply because those switches are special and hard to find.
>
> I presume replacing the switch on the Corsair is not a trivial shopping
> task. Used to be you could find a distributor of TV and radio parts that
> could make up any control combination, but that's no longer true. For my
> part of the Collins 821A-1 I made up a control out of TV parts that had
> the switch at the clockwise end of rotation. Took some cobbling and
> soldering to make the first one, but once written into a specification
> production units were on hand when I needed them even for a production
> run of only 9 units (that were completely replaced once so I used at
> least 18 special pots). I didn't ask the price. Just that for a manual
> PA drive pot, I wanted a detent and switch at full drive, which was full
> clockwise end of rotation.
>
> Even more commonly if it was a volume control with tubes it invariable
> was a half meg audio taper and the one variations needed were in the
> shaft and those kits had a wide assortment of shafts from smooth to
> serrated to splined to split and serrated with and with out flats that
> fit every possible knob variation. Sometimes similar pots are available
> from distributors of parts for fixing guitar amps these days.
>
> 73, Jerry, K0CQ
>
> On 1/2/2011 2:48 PM, Bwana Bob wrote:
>> Jerry:
>>
>> Thanks. I have the original breaker that Ten-Tec used on the Corsair
>> and it translates to an Airpax "instant trip", which are scarce. The
>> fast trip appears to be an acceptable substitute, though. I'll look
>> into the specs on the ATC fuses. A 5 amp fuse might be a good choice for
>> my Century 22, instead of a breaker. ATC fuses are certainly cheap and
>> plentiful. Good idea on the relay, too. My Corsair on/off switch
>> controlled the AC input to the power supply, but it still eventually
>> burned up. I haven't gotten around to replacing it. I just use the
>> switch on the T-T power supply.
>>
>> 73,
>>
>> Bob WB2VUF
>>
>> On 1/2/2011 1:29 PM, Dr. Gerald N. Johnson wrote:
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