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FDP Forum / Amp Mods, Repairs, and Projects / slowing Vibrato speed (Blackface amps) - deep dive

barry.b

australia

Oct 17th, 2019 09:44 PM   Edit   Profile  

hi all.

I'm trying to slow the vibrato on my 1965 Bandmaster.

I've tried the commonly recommended suggestion of replacing the 0.01uf with 0.02 … still not slow enough.

Before I try to do crazy things like shoehorning 0.047uf caps into the circuit, I think I need a better idea of what each of the three caps do, and what may happen when values are changed.

Can anyone help me with a deep dive of what these three caps actually do?

in this vid you can hear what different combinations do.

0.022 / 0.01 / 0.01 (stock)
0.022 / 0.022 / 0.01
0.032 / 0.022 / 0.01

Comparing Three Different Minimum Vibrato Speeds in a '65 Fender Deluxe Reverb

Roly
Contributing Member
**********
**********
*****

Whitehorse Canada

I don't get out much
Oct 17th, 2019 10:19 PM   Edit   Profile  

I'd just go fishing starting with three .022 caps.
I don't think a .01 is mandatory. Could be wrong, if that's the case, someone please correct me.....Peter?
I am surprised the usual mod is not slow enough for you.
What's your goal?
cheers

pdf64

UK

Oct 18th, 2019 04:45 PM   Edit   Profile  

I don't think it's essential for one of the caps to be 0.01uF.
There's a good idea for deeper, more intense trem over on the Hoffman forum, see link

Combine LED for oscillator bias and optocoupler

barry.b

australia

Oct 18th, 2019 06:50 PM   Edit   Profile  

@Roly

my goal?

2Hz or even lower. Real LFO stuff.

(This message was last edited by barry.b at 03:13 AM, Oct 19th, 2019)

FDP Forum / Amp Mods, Repairs, and Projects / slowing Vibrato speed (Blackface amps) - deep dive




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