I Have just acquired a 70's ampeg svt head and i dont know to much about it. i dont know what year it is, the serial number is 089755, which on one site that i found said its was possibly even a 69'. i can get more pics if that is going to be a help. it turns on and works but hasn't been touch much in recent years. there is no ground in the plug and when plugged in it shocks you through the strings.