I picked up a 150 head today for $45 at a thrift store thinking i'd read it to be a bass amp. Turns out this is the guitar version.

I've read Acoustic amps were similar between models, only slight variations and was curious if this could be modded to a 150b bass version? I can't get a hold of a 150b schematic or manual since that Acoustic wiki page seems to be dead. I read somewhere the 150b is transformer output?

Can anyone advise if this is possible with a few cap changes/tone stack mod or are they totally different beasts?

And does anyone have a copy of both the 150 and 150b schematics/manuals? I got two pages of the 150 from the Ampix site but I don't think its complete.

Thanks,
Michael

Hello all,

I am working on a Lab Series L4 for a friend. Not sure what is wrong with it, so I'm starting from the ground up. Looks like someone tried to rewire some things so I"m not sure what's original.

Haven't been able to find any schem or layout for this particular model, though I've looked over the L5,7,9,11 schem and layout since they are similar. They're close but not identical (obviously) so it's hard to tell exactly what's correct.

Does anyone have a schem or layout for the L4. Even closeup chassis pics of the wiring connection in the power supply would be helpful.

Thanks,
Michael