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PostPosted: Fri Nov 12, 2021 12:37 am 
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Joined: Fri Nov 12, 2021 12:15 am
Posts: 2
Hello everyone,
I have just completed my second build (first one was a Trinity Tramp). My TC 15 looks great (ok, maybe not as clean as some, but not bad). However, there is a lot of noise (crackling, popping) that sounds like its coming from channel 2. I'm at wits end at this point as I have tested and retested pretty much the whole build and haven't tracked down the issue. Voltage readings are normal on all the test points except for two - on the third terminal of the treble pot where it is supposed to read zero V, I get a full 25 V. I have tested the treble pot itself and it appears fine as it will go from zero all the way up to 1M ohm. I have also tested all the resistors and caps in channel 2. If I turn down all the pots on channel 2, I can use channel one with minimal noise (I can still hear it coming through a tiny bit). I also get a slightly high voltage reading at the 220k resistor just off pin 1 of V2 (156 V instead of 137 V). I think this may be due to my big cylindrical power cap having a slightly high capacitance on one side (42 mf instead of 32 mf). I also notice a bit of bleed through on the amp when it is on standby (I can still hear a tiny bit of signal coming through the speaker with standby on).

Any ideas to help greatly appreciated!

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PostPosted: Sat Nov 13, 2021 11:38 pm 
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Joined: Fri Nov 12, 2021 12:15 am
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Ok, so I figured out the scratchy sound issue after a LOT of testing. Turns out C5 was bad, the 47 pf cap. I tested it a couple times with my meter and the capacitance was reading fine, but the fact that I was getting DC voltage at the treble pot meant it was leaking. After ruling out many other issues, I tried replacing the cap and voila, noise gone! Been running the amp through its paces the last couple hours and I’m really impressed. I’m running it through a 2x10 cab with some TedWeber alnicos and it’s some great chimey tones! I still need to finish my head cabinet, but once I do I’ll post pics.


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PostPosted: Sun May 14, 2023 8:39 pm 
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Joined: Sun May 14, 2023 8:31 pm
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These problems I have encountered and seen directly with the repairman and I find it not very difficult.
dumb ways to die


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PostPosted: Tue Aug 22, 2023 3:33 am 
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Joined: Tue Aug 22, 2023 3:16 am
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The abnormal voltage reading at the treble pot's third terminal (25 V instead of 0 V) could be indicative of an issue in that section. bitlife


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PostPosted: Thu Nov 09, 2023 3:41 am 
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Joined: Thu Nov 09, 2023 3:06 am
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When I tried to replace the cap, the noise disappeared! I've spent the last several hours putting the amplifier through its paces, and I'm really impressed. The tones are fantastic when I run it through a 2x10 cabinet using TedWeber alnicos geometry dash


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PostPosted: Wed Mar 27, 2024 8:01 am 
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Joined: Fri Mar 22, 2024 10:25 am
Posts: 5
It sounds like you've put a lot of effort into troubleshooting your TC 15 build. Stay solar!


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