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The Central Institute for the Deaf-Max A. Goldstein Historic Devices for Hearing Collection.
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RadioEar Model PM Permo Magnetic Multipower, 1946

Ivory plastic two-piece body aid with 3 vacuum tubes, vertical microphone grills on front facing sideways, one dial on both sides, one dial on top, one cord for battery pack, one cord for ear receiver, and one silver clip on back. First wearable vacuum tube hearing aid with telephone coil. First VT hearing aid to use magnetic microphone.

Electro-Ear Model D, 1948

Ivory plastic one-piece, 3 vacuum tube body aid, round microphone grill has design of 4 curved slots that surround "AE" logo in center, front is slightly raised with line designs on bottom half, on/off/loudness dial on top, tone dial on side, battery door swings out from side, gold clip on back, one cord leading to bone conduction device.

Sonotone Model 977

Stainless steel one-piece 3 vacuum tube body aid, with green insert running vertically down the front, gold clip with 'S', two square microphone openings hidden by gold clip in middle upper front, 4 grooved lines running vertically aside the green insert volume control knob on top in green, on/off switch on top, and battery door swings out from side.

Sonotone Model 977

Stainless steel one-piece 3 vacuum tube body aid, with green insert running vertically down the front, gold clip with 'S', two square microphone openings hidden by gold clip in middle upper front, 4 grooved lines running vertically aside the green insert volume control knob on top in green, on/off switch on top, and battery door swings out from side.

Sonotone Model 900, 1945

Silver metal, one-piece, 3 vacuum tube body aid with grey plastic backing and middle insert, microphone grill on upper front is square with a gold lyre design insert, two dials on top, one cord for ear receiver/bone conduction plug on top, one plug in at bottom for optional two-piece battery pack, gold clip on back and battery door swings out from lower back side half. Serial no. 955832

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