trinityamps.com

Question #1: With the amp powered up and not in standby, should tapping on V1 produce an audible thump?

Question #2: What could cause a loud hum when the volume knob for the overdrive channel is turned up, without a guitar plugged in? Plugging a guitar in cancels the hum.

Thanks in advance to those more knowledgeable than I.

If you measure voltage or tap V1's plate with a non conductive material you should hear a small pop. As you move farther along in the signal path the "pops" you hear by touching the plates should get louder.

Sometimes if you tap V1 with a pencil you can hear some noise. Depends how sensitive your V1 is and/or it's microphonics.

Thanks.

I had my OD channel input jacks wired like this:



Having seen a different layout for the (blue w/ white stripe) ground run from the normal channel's volume pot, I moved it like so:



That got rid of the hum, but now the amp is acting pretty crazy - if I plug into the "hi" jack of the OD channel everything seems to work OK, but if I move the plug to the "lo" jack, volume drops off to a very low level for the knob setting, and if I turn it up halfway and start feeding signal (like hard-strummed chords) all of a sudden it will kick in to normal volume with one of the strums, scaring the crap out of me and probably jolting the speakers a bit.

Then, when I move the plug back to the "hi" jack, instead of working normally the volume is extremely low again, pulling the same scare-the-crap-out-of-me maneuver when I start playing (it will leap back to normal volume on the 8th or 9th chord, for instance). And I'm having similar issues now with the inputs fopr the normal channel.

I suppose, then, that I should move that run back to where it was?

Any other suggestions?

OK, I left the ground run where it was, and reflowed all of the solder joints on all 4 jacks and everything is good now.


Did I mention how much I still love this amp?

I was just about to say it was wired correctly and should work so it had to be soldering or mechanical contact.

Good news!!

_________________
Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

Yes, everything is great and it's just a spectacular amp. I will continue to recommend it and may just build another for a friend or two!