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Author Topic: New guy with an amp mod question.  (Read 465 times)

rbh32

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New guy with an amp mod question.
« on: October 31, 2018, 12:12:06 AM »

Hey guys!!
      I am fairly new to amp modding, I’ve mostly replaced LEDs in pedals and amps just for the fun of it.  Now I want to move up to modding the gain channel of my amp to LED clipping.  Problem is, I can’t find a schematic for my amp, which is a Traynor TRM-30.  It’s a 2 channel amp, and channel 1 sounds great clean.  Channel 2 is another story. It’s muddy and way too compressed, I absolutely cannot get the volume up to the clean channels level without putting too much of the amps horrible sounding  gain in for my taste. Is there anything I need to be looking for as far as the diodes that may need replacing.  I have heard that LEDs will up the volume on the channel they’re used on, and I have a few different values (colors) to play with. 

Any help would be greatest appreciated. 
« Last Edit: October 31, 2018, 12:33:27 AM by rbh32 »
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Jazz P Bass

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Re: New guy with an amp mod question.
« Reply #1 on: October 31, 2018, 01:29:20 AM »

Here is the schematic set. (TGM30_Page 7)

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rbh32

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Re: New guy with an amp mod question.
« Reply #2 on: October 31, 2018, 02:10:01 AM »

Ok, I think I found the gain stage, marked “2gain,” and it says it’s a 50k pot if I’m reading it righ, but I’m a little lost on where the clipping diodes might be...  I may have found two, marked 1N4148 (at d114) maybe, but don’t know if clipping is what they’re there for.  Am I getting close?
« Last Edit: October 31, 2018, 03:06:28 AM by rbh32 »
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rbh32

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Re: New guy with an amp mod question.
« Reply #3 on: October 31, 2018, 04:28:34 AM »

Ok, it looks like I’m on the right track.  The 1N4048s I think are the right ones, and they’re 1v forward voltage.  I’m thinking a two reds or one red and a yellow led to replace them would work.  The reds are 1.8v and the yellow is 1.9v. 
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Cpt. FixIt

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Re: New guy with an amp mod question.
« Reply #4 on: October 31, 2018, 05:02:27 PM »

You're correct, D114 and D115 are the ones you're looking for. If you find the dirt channel level still to be lacking, R19/R20 form a voltage divider, you could replace R20 with a jumper and R19 with 100k to double that channels output level.
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rbh32

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Re: New guy with an amp mod question.
« Reply #5 on: October 31, 2018, 06:37:51 PM »

That’s awesome!!! Thanks a lot guys!!! I’ll let you know what happens..
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rbh32

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Re: New guy with an amp mod question.
« Reply #6 on: November 02, 2018, 05:38:08 PM »

Alright guys, I did it!!!  I replaced both  1n4048s with two orange LEDs, rated between 2.0v and 2.4v.  It didn’t change as drastically as I thought it would, but that’s probably a good thing, because this channel is so much better now, and the gain up to 10 is still very usable and isn’t overpowering.  It starts to get a good articulate crunch around 6-7 and I think I’ll leave it there.  It’s a really cool distinctive switch between channel 1 clean to channel 2 crunch.   It still compresses, but now it’s alot less muddy than it was and I can get the volumes even with channel 1 and still have room to go up on channel 2 if I need it.  Overall, I’m extremely glad I did this, and thank you guys for all your help. 
« Last Edit: November 03, 2018, 11:47:25 AM by rbh32 »
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