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Re: [Amps] rotary switch - shorting/non-shorting

Subject: Re: [Amps] rotary switch - shorting/non-shorting
From: "David G4FTC" <>
Date: Thu, 30 Aug 2007 05:37:58 +0000
List-post: <>

>Amplifier tank or tuner, you NEVER want a shorting switch.
>( I never did get that fully drummed into the people at Amp
>A shorting switch means the contact, as the switch is
>rotated, picks up the next contact before releasing the last
>contact. This is unnecessary in a tuner or amplifier.
>Shorting switches almost always have significantly less
>breakdown voltage than non-shorting switches of the same
>The confusion comes from the fact we often want a
>pick-up-and-hold switch, which some people mistakenly call a
>"shorting switch". The other less common name for "pick up
>and hold" is "progressively shorting", but that is NOT the
>same as a "shorting" switch.
>You never want to order a switch called a "shorting" switch.
>If you do that the leading rotating contacts will come
>positioned closer to the next open contacts so it "makes" on
>the new contact before the old contacts are released or
>before the detent locks the switch. You will have a switch
>that is intentionally built with close spacing to the next
>open contact, and we never want that.

Aren't these switches known as "Make-Before-Break" and "Break-Before-Make".


David G4FTC

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