[Amps] variable capacitors

[Bill, W6WRT]

ORIGINAL MESSAGE:

On Wed, 26 Jan 2011 07:57:48 EST, TexasRF at aol.com wrote:

>So what application is the big demand for butterfly caps? I don't recall  
>ever using one here.

REPLY:

They are often used in push-pull tube-type amplifiers where the rotor
will be grounded. In the old days many amps were push-pull but these
days tube-type push-pull is mostly confined to VHF and UHF. 

73, Bill W6WRT