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PostPosted: Mon Dec 16, 2019 10:02 am 
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I recently purchased a Triwatt from Reverb a few weeks ago. I am noticing that the clean channel is not properly clean, it always has a slight break up to it regardless of volume. Also when the overdrive is not engaged, when turning the pot between say 0-1 there's a slight noise that can be heard.
There is a back ground hum also, which disappears when the overdrive is engaged and also when I gently tap V3 there's a massive pop.

Thoughts please ?


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PostPosted: Tue Dec 17, 2019 9:24 am 
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I have solved the distortion issue. Had a look at the wiring in detail last night. It would seem whom ever built the amp wasn't too careful. The workmanship is a little rough in places on first look.
There were a couple of resistors, one on the bass pot and one of the other pots (forget which one) that was grounding against the pot itself. I moved them off, slid a little insulation tape in between just for good measure and it went away. The amp now sounds clean when it should so I have to assume that was the problem.
The only other issue I have now is that when the OD pot is on position 0 or 10 there's a buzz ? It happens when it's not engaged. Does anyone have any idea why this would be happening ?


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PostPosted: Wed Dec 18, 2019 9:40 am 
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Looked again last night. It seems a sharp solder point on V3 was piercing the insulation on cable on the terminal next to it. It was barely noticeable. Moved it out the way and voila. I'm going to have to rework this amp a little for my own piece of mind.

Just thought I'd pass this along in case anyone else comes across any of these issues.

I took out the EH tubes that were in it, which for some reason couldn't handle a muff pedal very well (it sounded like it was bogging down) and put in some old JJ's I had laying around. The difference was night/day.

I have new tubes on order. I have to say the amp sounds fantastic with the Thames speaker I have.


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PostPosted: Fri Dec 27, 2019 9:39 am 
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Holy Ghost
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Location: Brighton, Canada
The. Triwatt is pretty sensitive to wiring and the OD can be one area to review. Also check the wire from the two pots that goes to the OD.

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PostPosted: Fri Dec 27, 2019 12:49 pm 
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Thank you for the reply. I noticed the master volume center pin is loose/wobbly and causes noise. My guess, over heating with the soldering iron. I've ordered an ALPS Blue Beauty to replace it, should be here tomorrow. It's obviously affecting the output volume too I've noticed.
Is there a full wiring layout available anywhere, I'd like to tidy this up and reduce any possible noise as much as I can.


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PostPosted: Fri Dec 27, 2019 2:30 pm 
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Experienced
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Location: Qualicum Beach, BC
Yes, sloppy wiring and poor soldering causes lots of problems.

Links to layouts, schematics, and build guides for all Trinity amps are on the Support page.
http://www.trinityamps.com/support/


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PostPosted: Mon Dec 30, 2019 5:03 pm 
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Corrected the wiring on the overdrive per the diagram. Needless to say it most definitely wasn't in a straight line !! I also replaced the master volume pot with the ALPS...very nice upgrade ! although it's a stereo pot and you only get to use one channel but even so, very open and clear sounding.

The only thing I notice now is the treble pot makes a weird sound when turned up full and cuts out completely, bad pot perhaps ? I'll be changing that when I get time, not that I max it out but I'd like it to work properly.


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PostPosted: Mon Dec 30, 2019 5:38 pm 
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Holy Ghost
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Location: Brighton, Canada
Let us know how that works after replacement.

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