BASCO Briggs & Stratton Berwick by Triangle Berstan Radio Products
Brush Crystal
Headphones
Bannard (Very ucommon set)
S.G. Brown Type F (English) Branston 2500 ohms
Benwood Co. 2500 ohms
Notes on the above:
Baldwin: Nathaniel Baldwin made headphones with the moving armature
for extra sensitivity, but were subject to deterioration in performance
due to rust, cracked mica diaphragms, and bent parts inside, but when
they
work optimally were very sensitive. A bit heavy on your head. The Type
C were the most pleantiful, but others were also made as pictured. In
some
you can see the assembly date written inside the housing with a red
crayon.
They made a Type B, C, G, E, N-2, and some with no model.
Bannard: Don't know much about these but are quite uncommon.
BASCO: Briggs and Stratton headphones to go along with their very rare
crystal radio, these are among my favorite headphones, made in 2000 and
3000 ohms.
Berstan: Seem to be fairly cheap consumer grade headphones, fairly
uncommon, sensitivity OK for local stations.
Berwick by Triangle: Well built headphones on par with Brandes in terms
of tone and sensitivity.
Brush Crystal: These were piezoelectric headphones with very high
impedance,
the piezo crystal tended to deteriorate over time, so they should be
kept
in a controlled temperature low humidity environment. I keep them in a
ziplock bag with a silica gel dessicator inside. Most pairs I have seen
are dead, but when they work properly are very sensitive.
Branston: Canadian make 1920's headphones, Branston made other radio
parts and Violet Rays too.
Email to
scott@oldheadphones.com
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