Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: FranciscoPerez on September 02, 2020, 03:06:39 am

Title: Vintage Optimus Alabama PA Amp conversion ideas.
Post by: FranciscoPerez on September 02, 2020, 03:06:39 am

Hello everyone,
I recently laid my hands on an old PA amp built on the 60's. It's an Optimus Alabama, 100W made in Spain.
It's in mint condition. Change the power cord, e-caps and a broken el34, and it'd be good to go.

Anyway, I'd like to convert it for guitar use. It uses 3 ecc83 and 4x el34 tubes. What do you think? Would this be a good candidate for conversion?  What guitar amp circuit would you recommend?


Thank you,
Fran

Title: Re: Vintage Optimus Alabama PA Amp conversion ideas.
Post by: Latole on September 02, 2020, 03:33:05 am

IMO you may just need to replace some caps values to make the amp more guitar "friendly"
Signal caps and cathod bypass cap

Values ? A la Fender or a la Marshall or........

Title: Re: Vintage Optimus Alabama PA Amp conversion ideas.
Post by: FranciscoPerez on September 02, 2020, 04:33:34 am

Thanks Latole.
Yeah maybe some minor changes would be enough, sounds like a fun weekend project.  :icon_biggrin:


It would be nice to make something different this time, though, since I already built a couple of Marshall and fender circuits and a Soldano, (Marshall 18W, Marshall JCM800, Soldano SLO100, Fender 5f2a, Fender 5e8a...).


Something to pair with a strat or tele, for blues/rock. I'd probably have to add a ppimv or similar, since this will be played mostly at home.