Acorn Tube -

Developed primarily by and introduced around 1935, the family includes several distinct types: Classification Common Use 955 Oscillators and detectors up to 600 MHz 954 Sharp Cut-off Pentode VHF amplifiers 956 Remote Cut-off Pentode Superheterodyne receivers with AVC 957/958/959 Battery Types Portable/military equipment (e.g., walkie-talkies) 3. Physical Design & Installation

: Their high input impedance made them ideal for probe tubes in vacuum-tube voltmeters. 5. Collecting and Maintenance acorn tube

: In some high-precision circuits, these tubes were soldered directly to the chassis to eliminate contact wear and further reduce resistance. 4. Historical Applications Developed primarily by and introduced around 1935, the

Today, acorn tubes like the RCA 958 are sought after by collectors and restorers of vintage RF gear. : Because the pins are sealed directly into

: Because the pins are sealed directly into the glass, they are prone to cracking the vacuum seal if handled roughly or if the socket is too tight.