My mother has had this amp for over 50 years and is now giving it to me.She used it for her Americana accordian. I remember using this amp when i was a young kid. I forgot for years she had this. Any of you out there know anything about it? I plugged in and it sounds pretty damn good! Kinda reminds me of a 5E3 circuit.I noticed there is a similar amp on the market called the Angry Robot. Not sure if its the same thing?? Can anyone tell me what year it is from the transformer?