Sharp-Cutoff Pentode
Miniature type used in compact radio equipment as an rf
amplifier especially in high-frequency, wide-band
applications. It is also used as a limiter tube in FM
equipment. This tube requires a miniature 7-contact
socket and may be mounted in any position.
Preferred Substitutes ........................ 4BA6
Substitutes .............. 4BC5 4BZ6 4CB6 4CE5 4CF6