Ifound this one nearly dead. It powered on, but that was about it. Both channels crackled and sputtered wildly, and barely any music made it from the inputs to the speakers — much longer and it would surely have suffered a catastrophic failure that destroyed it
This particular little amplifier offers 20W of power at
less than 0.5% THD and is a great example of elegant
understated styling from the late '70s. It's not the most
powerful amp out there by any means, but it fits nicely in
a room and has that classic hi-fi sound you just can't get
with anything else.
Inside the Amplifier
The A-401 stereophonic control amplifier was
designed in the USA and manufactured in Taiwan, and
was designed with both sound and serviceability in mind
which made it a real pleasure to work on. It features a pre-
Vintage stereo equipment just has a special sound and presence unlike
anything that's made today, and these pieces of hi-fi history are always
worth preserving and restoring. I recently got to work on a classic
from 1978: the Harman/Kardon A-401 stereophonic control amplifier.
Reviving a Hi-Fi Classic:
the Harman/Kardon A-401
Stereophonic Control Amplifier
By J.W. Koebel
46 July 2015
The dirty insides of this 38 year old amp.