Tube Amps / Music Electronics
|For current discussions, please visit Music Electronics Forum.|
|2/6/2004 7:17 PM|
||High pitch squeal....|
New homebrew Fender 6G6 Blonde Bassman normal channel only...GZ34 rectifier, 2x6L6, 2x12AX7. Works fine and sounds great, except for the following:
1) When I flip the standby switch off after playing, I get a high pitch squeal for a split second.
2)Also, the Presence knob doesn't do much except at the last 10% or so of its travel.
I've swapped the OT primary leads to the 6L6 sockets, and nothing is different.
Thanks for your help.
|And now, a word from our sponsors:
|2/7/2004 1:16 PM|
the high pitched squeal after playing is probably a cap discharging... most likely a filter cap.
the presence knob- doublecheck your resistor values, check the pot value. it's possible you have a resistor that's labelled one thing but is actually another.
|2/7/2004 4:00 PM|
Is there anything I can do about the squeal? It doesn't seem to do it all the time, but it is pretty annoying...
|2/7/2004 5:24 PM|
The JTM45 schematic from the JTM45 Yahoo discussion group shows a .047uF cap between the standby switch and ground...would something like this help?
|2/7/2004 10:01 PM|
that cap usually just kills the "pop" some amps have coming out of standby... but heck, it's worth trying it.
|Page 1 of 1|