1578 for 6SN7GT

I have, in my Wyetech Opal. They work beautifully, a large improvement. Make sure they are genuine though. I bought mine from a gentleman named Paul Lindeman, who has been very reliable.

Neal

I have a pair running in my Counterpoint NP100. The real 1578 has metal base and round hole plates.

Thanks for sharing your experience.
The GT tubes have higher voltages then "plain" 6SN7 I believe.
I wonder if 1578 tube is suitable to replace 6sn7GT tube.

Thanks