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Can i swap a 12ax7 for a different tube?
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How to change tubes in a tube amp with ease - Amp Tubes

Valve (Tube) Comparison Tests - Black Magic Amplifiers

Five Tips To Perk Up Your Tube Amp
How much difference do tube preamps make? | Page 3 | TalkBass.com

Can I swap a 12AX7 for a different tube? - Amp Tubes

preamp with tone controller - diyAudio

Best Tube Amp in 2021 - Get a Warmer, More Natural Sound

What Is Tube Amp Bias? - Andertons Blog

Vacuum Tubes for Amps | Pre and Power Tubes - Tubes for Amps