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.
73,
Charles - K5ZK
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