Tweet
Hi folks,
I assume I have a problem with the wiring of my latest project.
The amp is based on a deluxe reverb II or concert reverb II and sounds great in the clean channel (I added a switchable third gain stage here like in the champ II). Unfortunately the gain channel squeals at hi gain settings. If I set volume, gain and master at around 6 the sound is good. If I turn either pot higher it starts to squeal. I fumbled around with a chopstick and moved the wires around but there was no big change. (yes, I use shielded wire). (tubes are all brand new tung sol's and I even changed their places with one another).
Only difference to the Deluxe Reverb II in the gain channel is the plate resistor of tube 4A. In the original schematic there are two resistors 82k and 22k and in between them is the lead to the coupling cap. I use a 100k instead like I do in my clean channel. Can somebody tell me why there are two resistors in the fenders?
There is a .0005 cap from plate to cathode of that tube too. Can anybody tell me what that is for?
I appreciate any help or comment.
Thanx in advance
Matt
I assume I have a problem with the wiring of my latest project.
The amp is based on a deluxe reverb II or concert reverb II and sounds great in the clean channel (I added a switchable third gain stage here like in the champ II). Unfortunately the gain channel squeals at hi gain settings. If I set volume, gain and master at around 6 the sound is good. If I turn either pot higher it starts to squeal. I fumbled around with a chopstick and moved the wires around but there was no big change. (yes, I use shielded wire). (tubes are all brand new tung sol's and I even changed their places with one another).
Only difference to the Deluxe Reverb II in the gain channel is the plate resistor of tube 4A. In the original schematic there are two resistors 82k and 22k and in between them is the lead to the coupling cap. I use a 100k instead like I do in my clean channel. Can somebody tell me why there are two resistors in the fenders?
There is a .0005 cap from plate to cathode of that tube too. Can anybody tell me what that is for?
I appreciate any help or comment.
Thanx in advance
Matt
Comment