Hi,
I have a Univox U50 PA head that has a 6L6 power section with a 12AX7 phase inverter. It's a hybrid amp from the 70's. I'm trying to see if I can alter the tone section in order to add a tone stack. It has three knobs (four channels) - Volume, Treble, and Bass. I'm also trying to see if I can add a tube preamp to it, taking out the solid state section. Here's the schematic with markings - the part on the left is the tone section:
I have a Univox U50 PA head that has a 6L6 power section with a 12AX7 phase inverter. It's a hybrid amp from the 70's. I'm trying to see if I can alter the tone section in order to add a tone stack. It has three knobs (four channels) - Volume, Treble, and Bass. I'm also trying to see if I can add a tube preamp to it, taking out the solid state section. Here's the schematic with markings - the part on the left is the tone section:
