General HIFI > Amplification (Pre/Power)

Stax DA50 mono amplifiers

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brenden:
Stax da  50  mono blocs   now paired  with the Stax CAX  Pro .
   These are the small brother to to my
Stax DA100  full class A amps .
   The DA50 is   50 watts per channel 
   
 Modding has begun and already showing signs of greatness .
   

brenden:
Side view  showing heatsinks . Stax used a liquid sodium cooling system for heatsinks .
     Some of the mylar caps have been replaced with  very rare  Rubycon stlx  film and foil non inductive  caps .
   These are fantastic sounding caps  with extremely low esr and  made by rubycon  as  a high end partner for  their expensive    black gate capacitors  .
 

brenden:
This is the circuit board  with th excellent   2sk 240 dual fet in can .
   The larger brown  1uf  bypass  caps are gone . They really ruin the sound .  They have been replaced with  .01 uf auricaps . After that simple replacement it is a different amp altogether. Everything improved from bass mids and treble . Much better timbre and detail .

brenden:
Front .

stevenvalve:
Nice toy to work on. It will be interesting to see the necessary modifications of a transistor amp.

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