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The Harman Kardon HK775 (mono blocks) and HK770 (stereo version with less power) series of amplifiers that hit the market from 1980 through 1983 were high bandwidth, high slew-rate amplifiers built only with discrete components and a minimal use of negative feedback.

 

I believe that this series of amplifier benefited from the “trickle down” effect of Dr. Matti Otala’s engineering work on the legendary, no cost constraints, Harman Kardon Citation XX amplifier.

 

The HK775 was a fully symmetrical DC circuit design with quad differential cascode, a very large toroidal transformer, two 15,000uF capacitors in the power supply, discrete components only, and a protection circuit that was outside of the signal path.

 

 

_ Harman Kardon 775 mono block amplifiers inside.jpg

 

 

 

_ Harman Kardon 775 mono block amplifiers .jpg

 

 

_ Harman Kardon 775 mono block amplifiers 2.jpg

 

 

 

 

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Edited by Fjd
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