6AU6 tube question

[PIPELINE]

I have a home brew amp with four 7591 tubes and four 6AU6/A tubes. I am running RCA and Sylvania branded tubes at the moment. My question is could I improve on the sound quality by rolling other 6AU6 tubes, would this require re-biasing or other adjustment, or do you you go with, "if it ain't broke"....)what are others opinions on for alternative tubes?

 

[wa2ise]

You shouldn't have to bias 6AU6 tubes, as these are signal level voltage amplifiers and don't do any significant audio power. The circuit the tube is in should automatically bias these tubes anyway. So roll away.

 

[PIPELINE]

Wa2ise, Thank you for the reply.

 

[becketma]

You might like the CBS mil surplus, 6AU6WA.
Bob