Dating a fender bassman head

14-Jun-2017 14:15

You’ll need schematics to implement some of these mods. We usually start with explaining a mod from a functional perspective where we relate to components in the logical schematics diagram.Finally we point out location of components in the physical layout diagram.Speakers The Bandmaster’s 2×12″ speaker cabinet was from the Fender factory loaded with either Jensen C12n or Oxford 12T6.Personally we favor the Jensen C12n for their natural and transparent “Fendery” tone and, most importantly, for not being to bright and harsh.

As usual the later silverface models were modified to become cleaner and more powerful.The C12n sounds very punchy, wide and deep in a 2×12″ cabinet.See page How to select speakers for speaker recommendations. If you want cleaner and spankier preamp distortion charcteristics, you may replace the V1 or V2 12AX7 preamp tube with 12AT7 and 12AY7.The Bassman has a slightly bigger output transformer resulting in a firmer tone and more attack.A smaller output transformer will introduce sag and compression in the power amp section.

As usual the later silverface models were modified to become cleaner and more powerful.

The C12n sounds very punchy, wide and deep in a 2×12″ cabinet.

See page How to select speakers for speaker recommendations. If you want cleaner and spankier preamp distortion charcteristics, you may replace the V1 or V2 12AX7 preamp tube with 12AT7 and 12AY7.

The Bassman has a slightly bigger output transformer resulting in a firmer tone and more attack.

A smaller output transformer will introduce sag and compression in the power amp section.

The reverb amps will start to break up around 4-5 on the volume knob while the non-reverb amps stay clean to approx 6-7.