Koss Model One

...But you might get more responses at the Asylum linked below.

I heard the Koss one time at a dealer's, although I don't recall if it was the 1 or 1A. The only thing I remember, other than them sounding pretty good, was that they had a D battery holder on the back of each speaker.

I hope you're able to locate a schematic. Good luck.

Planar-Stat Asylum

RE: Koss Model One, posted on September 2, 2021 at 03:58:23

HighEndWire
Audiophile

Posts: 1624
Joined: August 2, 2002

HifiEngine has the following:

instructions English -
SE-6 AC bias modification English -
service manual (interim) English -

https://www.hifiengine.com/manual_library/koss/model-one.sht

RE: Koss Model One, posted on September 2, 2021 at 08:39:09
rhinohifi714 Audiophile Posts: 174 Location: oklahoma Joined: June 13, 2009	I would like to thank both the people who posted follow ups to my question regarding these speakers. But it appears that hifiengine gives a message that the download section is down for maintenance. I will try again later. thank you.

RE: Koss Model One, posted on September 2, 2021 at 09:50:18
HighEndWire Audiophile Posts: 1624 Joined: August 2, 2002	You are signed up for a hifiengine account? I just downloaded the service manual about a minute ago with no issues.

Speaker Asylum

Koss Model One

68.12.142.185