[Amps] Need help with switch nomenclature

[Roger (K8RI)]

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
>
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