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 Post subject: Tremolito Problem
PostPosted: Fri Jun 12, 2020 4:30 pm 
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Joined: Sat Mar 14, 2020 7:42 pm
Posts: 16
Location: Hancock, Michigan
Hi guys, I'm having a bit of an issue with the Tremolito PCB I bought. The trem works, but it seems to be acting as a light overdrive as well. The other thing is that the depth knob seems to not do much for probably 1/3 of the rotation, then it's good for a short time, then it's like an on/off sound. I checked to make sure that all the resistors, capacitors etc. are correct as well as the hook-up to the pots.
I know it looks like there may be a part or two touching, but I checked closely and they are not.
Note that I did not buy the kit, I bought the PCB and used my own parts on it.
Any help would be appreciated!


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 Post subject: Re: Tremolito Problem
PostPosted: Fri Jun 12, 2020 5:28 pm 
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Joined: Tue Jan 02, 2007 1:24 pm
Posts: 13516
Location: Albany, NY
Don't see anything obviously wrong. Where did you source the two JFETs from? There are a LOT of fakes out there these days.

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 Post subject: Re: Tremolito Problem
PostPosted: Fri Jun 12, 2020 5:42 pm 
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Joined: Sat Mar 14, 2020 7:42 pm
Posts: 16
Location: Hancock, Michigan
I got the two JFETs from BYOC when I ordered the PCB. One of the other transistors came from guitarpedalparts.com and one came from eBay (sketchy, I know). I did plug it in once without that eBay transistor in it just to set the trimpot level and it did the same thing with the overdriving.


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 Post subject: Re: Tremolito Problem
PostPosted: Fri Jun 12, 2020 7:58 pm 
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Joined: Sat Mar 14, 2020 7:42 pm
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Location: Hancock, Michigan
Might it make a difference that I used 1/4 watt resistors instead of 1/8 watt?


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 Post subject: Re: Tremolito Problem
PostPosted: Fri Jun 12, 2020 8:11 pm 
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skrattadu wrote:
Might it make a difference that I used 1/4 watt resistors instead of 1/8 watt?

No.

Check your various bent over components to makes sure that the metal legs are shorting against another metal surface.

If that doesn't turn up anything, working through this process often solves similar problems: viewtopic.php?f=9&t=52188

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“My favorite programming language is SOLDER” - Bob Pease (RIP)

My Website * My Musical Gear * My DIY Pedals: Pg.1 - Pg.2


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 Post subject: Re: Tremolito Problem
PostPosted: Sat Jun 13, 2020 4:16 am 
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Joined: Sat Mar 14, 2020 7:42 pm
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Location: Hancock, Michigan
I closely inspected it, can't find any shorts. Re-flowed all the solder joints, nothing changed.


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 Post subject: Re: Tremolito Problem
PostPosted: Sat Jun 13, 2020 10:18 am 
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Joined: Sat Mar 14, 2020 7:42 pm
Posts: 16
Location: Hancock, Michigan
Came back to it this morning, all of a sudden it works perfectly! Not sure what happened, maybe I was imagining things. Thanks for the help!


Last edited by skrattadu on Sat Jun 13, 2020 2:43 pm, edited 1 time in total.

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 Post subject: Re: Tremolito Problem
PostPosted: Sat Jun 13, 2020 2:00 pm 
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Well, if the problem comes back, we'll be here for ya!

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My Website * My Musical Gear * My DIY Pedals: Pg.1 - Pg.2


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