I have a TMB300 I got my son in 2016 and the preamp has altogether been problematic. The fit and finish is exceptional so if I can solve the preamp dilemna then problem solved. Any suggestions? 9v with double stacked knobs. If the par/ser switch were bypassed in the job I don't care. Series is ideal.
This is what I put in my TMB605 Classic VB 2B 2H Chrome I bypassed the active/passive switch and it works great .
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