WEBOct 21, 2017 · Hello, I own a 1950s Vega A-49 amp. Uses 5y3GT rectifier, 6sn7 preamp tube, 6v6GT power tube. I was fortunate enough to purchase another Vega A-49 amp yesterday, this one is likely from the 1960s and appears to be the same circuit. This newer amp has the 5y3 and the 6v6GT, but instead of a...