Duratron Model R Vacuum Tube Hearing Aid
The Duratron Model R one-piece vacuum tube hearing
aid was one of the early all-in-one hearing aids to appear on the market.
The Model R was produced about 1946.
The "Duratron" trade name was used by the C. L. Hoffman
Corporation of Pittsburgh, PA.
The Duratron Model R
used a "C" size 1.5 Volt A battery and a 30 Volt (type 430) B Battery.
The relatively large batteries made this hearing aid rather large,
measuring 5¾” by 2½” by 1¼” deep. With the batteries inside it
weighed 10 oz.