Vintage Masco MU-5 Tube Amplifier (40s?)

Description

Vintage Masco MU-5. I believe it is from the 40s. Selling as-is and how I found it. Needs repair but all parts look to be original. Powers on but produces a loud constant hum. It does produce sound from a plugged in instrument on all 3 inputs. Tubes light up but red power light does not. Leather on handle has come apart. Power cable has electrical tape on it. Various scratches and marks on case. See pictures for details. Very sought after rare amplifier desired by harmonica players and blues musicians.
Amp dimensions are: 13 x 11.5 x 7