Thank you to the above posters
in the past,when rolling tubes it's usually different nos brands of the same tube.
I have also tried 5751 tubes to lower the gain.This helped somewhat.
Even tried 12ay7 's.This worked for the gain but I couldn't find a brand that pleased my ears.
I had some 1960 12au7 so I tried them. This not only allowed better use of the volume control but a clarity ,body and space in instruments that I had never experienced in my listening room.
Trying to find information on this tube I noticed the difference of dissipation and that brought about my question.
Again thank you for your responses
in the past,when rolling tubes it's usually different nos brands of the same tube.
I have also tried 5751 tubes to lower the gain.This helped somewhat.
Even tried 12ay7 's.This worked for the gain but I couldn't find a brand that pleased my ears.
I had some 1960 12au7 so I tried them. This not only allowed better use of the volume control but a clarity ,body and space in instruments that I had never experienced in my listening room.
Trying to find information on this tube I noticed the difference of dissipation and that brought about my question.
Again thank you for your responses