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December 03, 2020, 06:11:55 PM

Author Topic: Changing a Smash to a headphone amp?  (Read 1104 times)

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Offline Alonzo

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Changing a Smash to a headphone amp?
« 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
BS Node to Gungnir>
BeePre>845 amp>Altec 414z, Kaiju>GPA 802-8G on Jabo horns, 45 Stereomour I> APT super tweeters
Saga>Vidar>PE subwoofers
SR-45 amp>HD800
Stat amp>Koss ESP/95
Garage: RPi4 to BiFrost>Stereomour I>Altec 299-8A w/MRII horns and Stereomour II to Petite Onken clones

Offline Paul Birkeland

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Re: Changing a Smash to a headphone amp?
« 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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Re: Changing a Smash to a headphone amp?
« 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
BS Node to Gungnir>
BeePre>845 amp>Altec 414z, Kaiju>GPA 802-8G on Jabo horns, 45 Stereomour I> APT super tweeters
Saga>Vidar>PE subwoofers
SR-45 amp>HD800
Stat amp>Koss ESP/95
Garage: RPi4 to BiFrost>Stereomour I>Altec 299-8A w/MRII horns and Stereomour II to Petite Onken clones