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EHHA RevA  Hybrid

 

Another headphone amplifier design by Alex Cavalli, a hybrid amp embedding a low voltage tube (6GM8/ECC86) as the differential amplifier front end of a solid state amp in symmetrical drive configuration. The only significant amplifer change to the previous EHHA is that emitter follower drivers have been added before the  output stage to get more bandwidth and to simplify the CCS on the input stage by using a CRD instead of a BJT. It can be buildt with either Mosfets or BJT's as the output devices. In comparison to the EHHA the RevA is more compact since each board incorporates the bipolar psu and the heater supply.

 

 

 

schematicschematic

 

 

I built the amplifier on a breadboard using a pair of Salas low voltage shunt regs to provide roughly +/- 28V. The psu was built fully double mono with two custom 40VA toroids. Initial listening indicated that everything was working as intended and it also sounded promising. For tube rolling I had bought a small stash of 6GM8 tubes and also their russian equivalent 6N27P. But as life goes... the EHHA RevA project was abandonned and eventually sold to a fellow DIY'er in Estonia!

 

 

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