Hoffman Amplifiers Tube Amplifier Forum
Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Sandoz6G16 on August 28, 2013, 08:17:35 pm
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Has anyone tried to put speed and intensity on organ volume pedals or wah pedals before it seems like it would be easy to use a stereo jack and wire up a pedal and would be a nice feature
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go for it!
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got a speed control for my boss spinny speaker thing. 1meg pot in a wah shell. wiper(center), & outer leg(either). if it goes "wrong way'' (slow down, fast up}, or vice versa, but you want other direction, just change outer wire to other side; 1, or 3. 2 is middle. assuming you have jack for speed. super easy, and fun for ramp up, ramp down make the drunk dancers dizzy effects/affects!
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You could have a simple 'stepped' tremolo speed control with a dual foot switch that parallels a couple of resistors in the RC feedback network in the LFO stage. The resistors themselves would be in the amp, and you could then get away with just an ordinary passive foot switch (like the way its done in a 1960 AC30)
While I could think of handy uses for occasionally changing the trem speed on the fly, I usually wouldn't change the intensity in mid-song in most gigs. I just fiddle with the depth knob between tunes.
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Univibe did it (Jimi,Pink Floyd..). It used a dual pot (100K log, maybe one was reversed from the other?). One controlled the speed of the oscillator, the other controlled tone (??)
It would be easy to use a switched jack that would override manual amp-located pot speed. The intensity might be a trick, depending on the circuit you are trying to adapt it to.
for example: If adapting, say a tremolux, you'd have to run 3 wires to the pedal-pot just for intensity. with a TRS stereo jack, you've got three wires that you can send to a remote pedal. If you use a switched jack, you can have pots in the amp the pedal overrides. For speed, its easy: 1 mono switch jack. For intensity, you'd need to use another TRS switch jack (no ground in that one). So, it could be done with 2 TRS 1/4 jacks.
If you don't care about having override-able pots in the main chassis, and you are content to say the amp doesn't function without the pedal, you could use a DIN-5 or something like that.. (non-switched...)
are you envisioning two footpedals,? One for speed , one for intensity?
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While I could think of handy uses for occasionally changing the trem speed on the fly, I usually wouldn't change the intensity in mid-song in most gigs. I just fiddle with the depth knob between tunes.
I like to change speed all the time, fast slow, like a B3 player ramping a Leslie up & down. sounds great, to accent movement from verse to chorus, or any change in a songs form