I have have Bandmaster Reverb TFL 5005D. It's the vintage that uses a 5U4GB. On the page :
https://wgsusa.com/little-love-fender-bandmaster-reverb
there's a bias mod talked about. What is the mod, could someone link me please?
Bring Silverface to Blackface Mod
11/06/2019 12:24pm
Absolutly ... and it applies to ALL later silver-face Fender amps!
http://www.blueglow.de/TechPaper/BalancePlus.html