On 4/25/2013 11:50 AM, Charles Bibb - K5ZK wrote:
Way back in my foggy memory somewhere, I remember using and amplifier
made by B & W. I think it was a "Model 1500", but I'm not sure. It
used a pair of 813's.
What I remember as unique about this amp was its "ON" or "POWER" switch.
It used a rotary switch to turn on the various functions one at a time.
In other words: Position 1 turned on the fan only. Position 2 kept the
fan on, and lit the filaments. Position 3 kept the previous two
functions on, and turned on the HV supply.
My question is, then: What is this kind of switch called? I used one
of these switches (salvaged from an old tube tester) in my very first
amplifier, and I'd like to use one again, but for the life of me I can't
find one from my usual parts sources because I don't know what it's
properly called.
It isn't "make before break" because it never breaks the previous
positions. I thought it would just be a "shorting type", but this is
not the way any of the "shorting type" switches offered for sale operate.
I'm stumped! Any help would be appreciated.
It's a shorting switch.
In the case where it just keeps adding elements, it's a progressive,
shorting switch.
73
Roger (K8RI)
73,
Charles - K5ZK
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|