Bottlehead Forum

Bottlehead Kits => Legacy Kit Products => Smash => Topic started by: Alonzo on May 10, 2016, 08:28:07 PM

Title: Changing a Smash to a headphone amp?
Post by: Alonzo on May 10, 2016, 08:28:07 PM

My fully upgraded Smash is lounging away in the garage, I wonder if it would make a pseudo SEX amp?  Add OT-2 transformers, BCP-15 plate choke, step up input transformer maybe?  I have all these parts sitting around, what kind of FrankenSmash would it make?  Decent headphone amp maybe?

Title: Re: Changing a Smash to a headphone amp?
Post by: Paul Birkeland on May 11, 2016, 07:36:17 AM

You could gut the smash and use a 12AU7 or 6SN7 as a driver tube to drive the 4P1L.  The big problem will be the available voltage and the amount of power you're going to get out of that, which won't be all that marvelous. 

Title: Re: Changing a Smash to a headphone amp?
Post by: Alonzo on May 11, 2016, 08:12:13 AM

Yeah, it's more for fun than practical.  I have the parts laying around and the Smash wasn't being used.  I was thinking of hanging a support "T" below the chassis plate for all the transformers, chokes, driver tube and it's filament transformer.  That way I wouldn't have to gut the Smash.  I had a simple plan that seems more complicated than it sounds.
1) below decks, add a driver stage, 12AU7 or so, adjust 4P1L to run a little hotter for more output.
2) add headphone and speaker outs to top chassis, impedance switch