![[-]](https://theultimatetone.com/images/collapse.png "[-]")
02-09-2025, 04:23 AM
Alright, I've done some measuring. The input jacks are arranged such that when plugged into the "high" input the signal flows from the first stage, through the "low" jack tip switch contacts and to the pre-volume that sits before the second stage. Nothing new for those of you familiar with the circuit, but I mention it because that switch measures 40 Ω across the contacts. A far cry from the < 1 Ω specified. Today I replaced the two input jacks with new UK-made Cliff jacks, and now I measure a fraction of an ohm across that switch in the circuit. The old jack I pulled measures all over the place out of the circuit, anywhere from 15 Ω to 1.5 MΩ. So at the very least, that connection was an issue.
After replacing the jacks, I have not been able to reproduce the issue I was having. No matter how softly I play, the signal doesn't cut out or get overly distorted. Also, I could be wrong, but the amp seems "cleaner" and less "fizzy" after the jacks were replaced. There were low single notes that had a fizzy haze on them previously, and that doesn't seem to be the case anymore. We'll see how things hold up after some more playing and if the recordings I get sound any different than they did before. Thinking the next thing to do, if this fix holds, is to improve the ground scheme. BZZZZZZZZZ!
After replacing the jacks, I have not been able to reproduce the issue I was having. No matter how softly I play, the signal doesn't cut out or get overly distorted. Also, I could be wrong, but the amp seems "cleaner" and less "fizzy" after the jacks were replaced. There were low single notes that had a fizzy haze on them previously, and that doesn't seem to be the case anymore. We'll see how things hold up after some more playing and if the recordings I get sound any different than they did before. Thinking the next thing to do, if this fix holds, is to improve the ground scheme. BZZZZZZZZZ!
