[Amps] Need help with switch nomenclature

[Ron Youvan]

On 04/25/2013 02:50 PM, 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.

   If you use DC relays to control everything, any non-shorting rotary 
switch can be used with the addition of steering diodes.
-- 
   Ron  KA4INM - Youvan's corollary:
                 Every action results in unwanted side effects.