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Hello everybody,
I modded my fender Blues Junior for a PPIMV but I have e weird problem: when master is all the way up everything is ok, but when it's turned down even by a minimal amount I get an high pitched whistle if the volume knob is above 12 o'clock.
The phase inverter and the third gain stage are modded to the trainwreck liverpool specifications, so a large amount of signal is hitting the phase inverter. I already tried to disconnect the NFB but nothing changes.
Does anybody has ever had a similar problem? It's so weird to me that the whistle appears only with the master turned DOWN.
Thank everybody for the help
I modded my fender Blues Junior for a PPIMV but I have e weird problem: when master is all the way up everything is ok, but when it's turned down even by a minimal amount I get an high pitched whistle if the volume knob is above 12 o'clock.
The phase inverter and the third gain stage are modded to the trainwreck liverpool specifications, so a large amount of signal is hitting the phase inverter. I already tried to disconnect the NFB but nothing changes.
Does anybody has ever had a similar problem? It's so weird to me that the whistle appears only with the master turned DOWN.
Thank everybody for the help