I have a Laney VC30 and it's in need for a valve change. I'm no expert and was just wondering if i have to get someone to bias them. I thought that was only for older amps and certain Fenders and Marshalls. Please clear this up for me, thanks.
Fender American Standard Stratocaster
Fender Highway One Telecaster

TC Electronic Polytune
Electro Harmonix Pitchfork
Voodoo Labs Sparkle Drive
Fultone OCD
Electro Harmonix Nano Big Muff
TC Electronics Flashback X 4
Strymon Blue Sky
Strymon El Capistan

Vox AC4