harsh grainy sound in princeton

[Joe Blow]

I replaced the tube sockets for the power and rectifier tubes in a 1965 fender princeton reverb. I got rid of the intermitent poping but now my tone is harsh grainy and no bottom end. Also I notice a bit of an occillating sound when Im not playing anything thru it. I changed the non adjustable fixed bias to the variable resistor method and I can adjust the bias now but that didnt solve the problem. Ive got a new c10q speaker coming in the mail so Ill see if its that. anybody got a suggestion I would greatly appreciate it.

[Rockin' Daddy]

Be careful when adjusting that bias since your amps tremolo is the bias vary type. You could push the tubes over spec if you don't watch it.
Re and re-check your wiring and do it twice again. Look for cold solder joins, dull and/or grainy looking. Solder joints should be shiney.