Changing a Smash to a headphone amp?

Alonzo · 2149

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Offline Alonzo

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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?

Alonzo
Gameroom:>Mainline to HD820, SR45 to Pipette
>BeePree Kaiju & SII to Altec 19 knockoffs
Office:>BH Stat amp to Koss 95x, T20 SET to JBL 4309s
Den:> MorePlay 845 SET to Altec Valencia's


Offline Paul Birkeland

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Reply #1 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. 

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline Alonzo

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Reply #2 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

Alonzo
Gameroom:>Mainline to HD820, SR45 to Pipette
>BeePree Kaiju & SII to Altec 19 knockoffs
Office:>BH Stat amp to Koss 95x, T20 SET to JBL 4309s
Den:> MorePlay 845 SET to Altec Valencia's