ID Bassman 100 1967?

[Oddvar R]

Can anyone tell me what board this is? Bassman 100 from ,1967.

[pompeiisneaks]

What board? Do you mean what is the material used? I don't know the name of it but it's typical of fender for a long time. It's a type of fibrous material they'd soak in wax to help reduce the chance of it becoming conductive, but it seems to only last for a limited time before starting to leak DC across to other connections. Many do a full gut and replacement of the same components (or at least equivalent if some have gone bad) on FR4/Garolite to make it much more sturdy/future proof.

That material is kinda crappy, but was super cheap for fender, so I'm sure it made them happy

~Phil

[Ten Over]

The resolution isn't high enough for me to see the date code on the bias pot, but I know it is a 1975 to 1977 export model.

[Stevem]

That amp is no where near stock!!

You're missing preamp tubes and only the normal channel is wired up to work.

Far better pictures are needed and all the number stamping info off of the PT or OT would be a great help!

[pdf64]

The resolution isn't high enough for me to see the date code on the bias pot, but I know it is a 1975 to 1977 export model.

Those white plastic bodied ecaps on the board seem typical of the late 60s / early 70s IME.
This looks to be the schematic https://el34world.com/charts/Schematics ... _schem.pdf
I think that model was 71-76.

That amp is no where near stock!!

You're missing preamp tubes and only the normal channel is wired up to work...

What’s missing or not stock?

[Ten Over]

Those white plastic bodied ecaps on the board seem typical of the late 60s / early 70s IME.
I think that model was 71-76.

The white Mallory's were still being used as recently as 1977. That outward facing rear lip appeared in 1975 along with the hum control ruling out 71-74. Fender went to 135W Bassman's part way through 1977, so there were still Bassman 100's in the first part of 1977.

[Ten Over]

That amp is no where near stock!!

You're missing preamp tubes and only the normal channel is wired up to work.

Far better pictures are needed and all the number stamping info off of the PT or OT would be a great help!

The amp is damn near stock. There is something funny by the pilot light and a couple of the PT primary taps are taped-off. All of the preamp tubes are present and both channels are wired-up.

[Charlie Wilson]

Transformer codes?
CW

[Paul G.]

That amp is no where near stock!!

You're missing preamp tubes and only the normal channel is wired up to work.

Far better pictures are needed and all the number stamping info off of the PT or OT would be a great help!

Nope. It's all there, and looks pretty well stock.

bm100.jpg

[Ten Over]

Nope. It's all there, and looks pretty well stock.
bm100.jpg

Odd schematic and nowhere near correct for a Bassman 100. pdf64 referenced the correct schematic above.

[Paul G.]

Nope. It's all there, and looks pretty well stock.
bm100.jpg

Odd schematic and nowhere near correct for a Bassman 100. pdf64 referenced the correct schematic above.

I don't remember where I got that schematic, but even the one you're showing has two 12AX7s in the preamp, one 12AT7 for the PI -- exactly the number of tubes in the photograph. Don't forget -- bass amp, 2 stages of gain (gain, tonestack recovery) is plenty for an amp intended for clean, clean, clean.

[Ten Over]

I don't remember where I got that schematic, but even the one you're showing has two 12AX7s in the preamp, one 12AT7 for the PI -- exactly the number of tubes in the photograph. Don't forget -- bass amp, 2 stages of gain (gain, tonestack recovery) is plenty for an amp intended for clean, clean, clean.

That schematic is an AB763 Dual Showman with the tremolo and death cap removed. There are numerous differences between that and a Bassman 100.