Early last year, I found a Dynaco Stereo 80 (PANOR), normally designed for EL-34, but this one came with KT-66 (Shuguang).
I did change these with Gold Lion KT66 and all driver tubes are now NOS.
The amp sounds great (not like the ST-120, but still very good) and is a pleasure to look at. However, lately, I have been searching more information on EL-34 alternatives (I like "big" bottles) and this was 6CA7 and.... KT77, not KT66
Can someone shed some more light on the interchangeability between EL-34/6CA7/KT77 and KT66
The amp biases perfectly, but still I am wondering if putting KT66 on it is "right", doable and safe.