TriodeLuvr wrote: ↑Sat 03/27/21 11:27 pm
That probably rules out oscillation, which is why I asked the question. This result still doesn't eliminate the possibility of shifted-phase signals mixing in that resistor, though. The only way to know is to plug in the effects that are creating the problem and temporarily lift the resistor out of the circuit.
Jack
Jack,
Yeah, I understand that there may still be a phase issue that the test above wouldn't not uncover. I was looking for low hanging fruit here. Without understanding exactly how the circuit is mixing signals, I'm having a hard time wrapping my head around how to determine a phase issue outside of thinking I'd have to connect my oscilloscope somewhere before and after the 'mixing' of the signals? Even if I could prove that, I'd be hard pressed to know how to resolve.
JMPGuitars wrote: ↑Sun 03/28/21 6:14 am
Billy_Goat wrote: ↑Sat 03/27/21 11:04 pm
Anyway, I'm guessing that the combination of my pedals is not playing nice with the FX loop unfortunately for whatever reasons. With my pedal board in front of the amp, all is well. I wasn't able to bring along my pedal board to the studio this trip, so I was unable to test that to make any deeper confirmations.
Ah, I see. Not all pedals work in a passive effects loop, and not all pedals should be removed from the front of the amp, even with an active effects loop.
What kind of effects were you having issues with? Try some simple effects like reverb, tremolo, or delay, with nothing else attached to them and see how it sounds.
Thanks,
Josh
Hi Josh,
For the record, I've tried 4 separate and different wiring schemas for the FX loop so far. The last being wiring as you indicate in your build picture, Josh. Meaning, the components wired directly to each other and then shielded and shrink wrapped.
Well, as I'm sure you are aware, pedal boards are a fluid thing and mine is constantly changing... Currently my board consists of in it's signal order... trying to keep all of the time based FX's in the FX loop.
In a perfect world...
Guitar --> JHS Little Black Buffer --> Origin Effects Cali76 Stacked --> AnalogMan Sun Lion --> Chellee Ponyboy Overdrive --> Fire Custom Shop Carpe Diem Boost --> Boss RC-3 Lopper --> Amp Input
FX Send --> Source Audio EQ2 --> Neo Instruments Ventilator II --> Ten Effects Barracuda --> MXR Carbon Clone Mini Delay --> EHX Oceans 11 Reverb --> FX Receive
Since the above doesn't work so great atm, all pedals in front of the amp like this works as expected...
Guitar --> JHS Little Black Buffer --> Origin Effects Cali76 Stacked --> AnalogMan Sun Lion --> Chellee Ponyboy Overdrive --> Fire Custom Shop Carpe Diem Boost --> Boss RC-3 Lopper --> Source Audio EQ2 --> Neo Instruments Ventilator II --> Ten Effects Barracuda --> MXR Carbon Clone Mini Delay --> EHX Oceans 11 Reverb --> Amp Input.
Question for Josh or Jack - if you don't mind... for troubleshooting purposes, what parts of the FX loop can be removed without affecting the rest of the amp? Can I disconnect the two connections to and from the FX loops jacks at the terminal board and / or do I also need to remove the 68K mixing resistor?
Thanks again in advance!