A Look Back at an American Invention
Figure 3. The original circuit drawing, as shown on the patent application. Four NPN transistors were used. Note that MMF = pF.
many TR-1s were damaged inadvertently when collectors
attempted to open them the way they would any other
radio, potentially cracking the case. The correct way to
open the TR-1 is to gently squeeze each side of the case
and remove the back.
Available accessories included a leather case and an
Circle #127 on the Reader Service Card.