How quiet is it possible to get a SF Twin Reverb's tremolo "tick"?

itsGiusto

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I'm working on restoring a 1972 Twin Reverb. When the tremolo is on, it formerly made a very loud tick. I moved around the wires a little bit to get this slightly better. Contrary to what RobRob says here (https://robrobinette.com/Silverface_Amp_Mods.htm#Tremolo_Ticking), moving the V5 pin 6 plate wire didn't actually make any audible difference. However, moving around the two V5 grid wires, to lift them away from the board and other wires, did reduce the loudness of the tick a little bit.

But the tick is still there, unfortunately. And even more unfortunately, the .01uf cap RobRob recommends installing across the roach is ALREADY there, it's been there since before I got the amp! I've found that putting in another .01uf cap across the 10M attached to the roach can get me a little bit more of thump-reduction, and even moreso if I attach a .02uf cap instead. Should I add that?

Also unfortunately, the eyelet board itself is really brittle and in bad condition, so I don't want to take it apart in order to change the tremolo driver plate wire (V5 pin 6, that wire runs under the board) from non-shielded to shielded, like RobRob suggests, especially since I found that chopsticking around that wire had no effect.

Anyway, I'm not sure if the tick is a problem or how much more quiet I can realistically get it. Truly if the amp volume is above 3, and I'm playing my guitar through it, I don't notice the tick at all. However, when I stop playing, the tick is more obvious. In addition, if I turn off the reverb, the tick becomes much less noticeable. So is this just something really small that it's impossible to get perfect, and I just have to live with?
 
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Dacious

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There shouldn't be an audible tick. Unless you have extreme EQ settings. Try lifting one leg of the .01 or replacing it. These do go bad. Rarely but does happen.
 

itsGiusto

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There shouldn't be an audible tick. Unless you have extreme EQ settings. Try lifting one leg of the .01 or replacing it. These do go bad. Rarely but does happen.
I didn't try lifting or replacing it, but I did try clipping a .01uf, and then a .02uf cap in parallel with it. Neither had a very large effect. Is that comparable to replacement?
 

itsGiusto

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Please let us now if this works for you! It sure did seem to work well for @adnanb ! https://www.tdpri.com/threads/fender-deluxe-reverb-tremolo-ticking-clicking.407859/page-2
Definitely seems to work well, clicking completely stopped, and tremolo sounds the same otherwise.

There is one problem, though, and I don't know if it's a big problem, or if it predates the addition of the new cap. If I turn the tremolo speed knob aaaaalll the way down, so the tremolo is at it's lowest setting, the intensity slowly drops out, until there's no tremolo. Once I turn the speed up a little bit again, the intensity comes back in again. Basically, I just can't keep the tremolo speed at its lowest for some reason.

I encountered this recently when I built an EA tremolo pedal clone as well, when I'd mod some values of the tremolo caps to try to get the tremolo to sound faster, this would happen at the lowest speed setting.
 
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theprofessor

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Definitely seems to work well, clicking completely stopped, and tremolo sounds the same otherwise.

There is one problem, though, and I don't know if it's a big problem, or if it predates the addition of the new cap. If I turn the tremolo speed knob aaaaalll the way down, so the tremolo is at it's lowest setting, the intensity slowly drops out, until there's no tremolo. Once I turn the speed up a little bit again, the intensity comes back in again. Basically, I just can't keep the tremolo speed at its lowest for some reason.

I encountered this recently when I built an EA tremolo pedal as well, when I'd mod some values of the tremolo caps to try to get the tremolo to sound faster, this would happen at the lowest speed setting.
Glad it worked! Interesting about the speed, though...
 

itsGiusto

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Glad it worked! Interesting about the speed, though...
Yeah, definitely interested to hear if others have encountered this phenomenon. Given the fact that I've encountered it across two separate tremolo-circuits I've worked on, I'm guessing it's normal, something characteristic of tube or transistor-driven oscillator-circuits, but I don't really know how to deal with it. And I tried Googling a little bit, but couldn't find anything. Maybe I'll try swapping in some bigger caps in-place of the .01uf phase-shifting caps?

Edit: tried clipping in bigger caps in-parallel with the phase-shifting caps. Didn't help this problem.
 
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