amp vibrato (was: Little Walter was Re: throat vibrato)

I know some amps have effects named 'vibrato', but aren't they in all 
cases really tremolo?  Did any vintage amps have a circuit that could 
actually alter the ~pitch~ of the note being played?

On Sun, 9 Feb 2003 11:27:56 EST, Markburness@xxxxxxx wrote:
>Long before, and during,  the advent of on board reverb most
>incorporated vibrato or tremolo into their amps.

- -- 
John Thaden
Little Rock, Arkansas

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