Somewhere I have a receipt for work performed I will continue to try and locate that. My feeling is the switch shown in photo 5 is possibly a ground switch. Each amp uses a 40 watt bass amp and 10 watt treble amp. Plus has built in adjustable line level crossover.
Each amp uses 8 6V6, 2 12AX7, 2 5U4. My Commitment is to Your 100% Satisfaction! Vintage Treasures At low Prices. I'm human make mistakes and not perfect please give me the opportunity to make things right if not completely satisfied.
It is the star system at the bottom of the feedback page. If there is a problem with item please contact me before opening case or leaving dsr ratings! IF YOU ARE NOT PLEASED LET ME KNOW AND I WILL WORK TO MAKE IT THAT WAY. The item "Magnavox Concert Grand Bi-Amped Mono Block Tube Amplifiers restored withtubes" is in sale since Wednesday, January 22, 2020. This item is in the category "Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps".
The seller is "flukyfinds" and is located in Lake Oswego, Oregon. This item can be shipped to United States.