IBM The Illinois by Wayland ICA No. 23 Insuline Corp.
IBM
The
Illinois
by Wayland ICA No. 23
Insuline Corp.
JACO, J.H. Ambrose & Co. KAY headphones, must be quite
rare, this is the only pair I have seen
Kellogg model 64B
Kennedy 1500 ohms (per side, 3000 ohms total)
Kollmorgen OPT
Nice
real
leather headband on the Kennedy set
Keefe-Gartner Corp. Phila.
PA.
Keystone,
by
American Electric 2200 ohms DC resistance
Krauss Buckeye 3000 ohm headphones, very uncommon, in fact,
downright rare, I dare say having only seen this one pair. Nice
deep embossing on the back of the housings, and this pair is in
working condition and the sound is quite good even on crystal
radio.
Kainer Headphones
Another uncommon pair of headhones, Kainer & Co, Chicago,
similar design to Western Electric types, nice shiny chromed
housings
Heslar 2000 ohm headphones, another very uncommon set, also never
seen another one apart from this set.
Some Notes on the above headsets:
Holtzer Cabot: Holtzer Cabot made several different headphones
from the 1920's such as the big can Universals which were good
quality with pretty good sensitivity, and the small can 2000 ohm
sets pictured that had excellent sensitivity. They also made a
military set that was equivalent to WE 590's.
Holleyfone: Don't know much but I have one set with aluminum cans
and this set with nickel plated brass housings, 2000 ohms.
ICA: Insuline made various test equipment and the headphones were
cheap consumer grade, look like they might have been made by
Cannon.
JACO: Ambrose took over from Cannon, Cannon and Miller, and if you
go back even further, Cannon took over brandes headphones. JACO
was still making headphones last I checked around 2001, in New
York State. This pair of JACO's had the earcap crimped on so you
can't get inside to fix them.
IBM: I don't know anything about these headphones, look like Trimm
design but this is the only pair I have ever seen of IBM magnetic
type headphones.
Kellogg: The Kellogg Telephone Company also made radio parts such
as these 64-B 2000 ohm headphones. They had a unique headband and
were very good quiality, with good sensitivity.
Kollmorgen: These must be very rare as this is the only pair I
have ever seen. and they are not on the OTB Master Headphones
List. 2200 ohms
Kennedy: The Colin B. Kennedy Company made high quality radios in
the 1920's and their headsets are also well made. I have only seen
a few pairs as they are quite uncommon and I have seen them go for
well over $200 at auctions. The ones I have seen had real leather
covered headbands and cloth cord. The construction and parts are
interchangeable with early bakelite Trimms and I wonder if Trimm
made these for Kennedy.
Keefe-Gartner: This is a very high quality headset
with douible metal headband, celluloid insulator plate on the
cans, nice bakelity earcaps, and 4 magnet bars per side. They are
3000 ohms DC resistance and sound great with crystal radio. This
is the only pair I have ever seen, makes them seem rare to me.
Keystone, by American Electric: Another pretty uncommon het of
headphones, again the only one I have ever seen so must be pretty
rare, look similar to the Western Electric 509-W headphones from
the outside, but have a single coil in each housing rather than 2
coils.
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Holtzer-Cabot Headphones from Radio News, August, 1922
Holtzer-Cabot Head-Sets, from Radio News, December, 1923
Kilbourne & Clark Headphones from Radio News, September,
1922
