FastRedPonyCar
Well-known member
My studio preamp is quite as a mouse on the clean channel but has a loud hum/buzz on the overdrive channel. The higher the overdrive knob is, the louder it is.
I've swapped all of the preamp tubes except for the reverb tube and the buzz is still there.
I don't have any spare 12AT7's laying around. I have 2 questions.
A) would it be safe for me to test the amp using a 12AX7 in the reverb socket? Or would this damage the amp?
B) Has anyone else experienced this humming sound before and if so, what was the culprit?
Noise from an amp this old is expected but it's very noticable. I have to go to the clean channel when not playing and I can't roll the volume knob back and clean up the overdrive channel without being overpowered by the humming sound
Visaually, nothing is loose or out of the ordinary inside the preamp and the amp makes the exact same sound in both power amps I've used and direct to my mic preamp to the PC so it's definately the preamp causing the noise or more specifically, something up with the overdrive channel.
I've swapped all of the preamp tubes except for the reverb tube and the buzz is still there.
I don't have any spare 12AT7's laying around. I have 2 questions.
A) would it be safe for me to test the amp using a 12AX7 in the reverb socket? Or would this damage the amp?
B) Has anyone else experienced this humming sound before and if so, what was the culprit?
Noise from an amp this old is expected but it's very noticable. I have to go to the clean channel when not playing and I can't roll the volume knob back and clean up the overdrive channel without being overpowered by the humming sound
Visaually, nothing is loose or out of the ordinary inside the preamp and the amp makes the exact same sound in both power amps I've used and direct to my mic preamp to the PC so it's definately the preamp causing the noise or more specifically, something up with the overdrive channel.
