6CB6A

Miniature 7-pin high-transconductance sharp-cutoff pentode with controlled heater warm-up intervals, engineered for high-gain RF and IF amplifier stages in consumer television sets. Equivalents: 6CB6, 6CF6, EF190, 6BC6. Real-Life Examples: RCA Victor console televisions, late 1950s TV receiver intermediate frequency (IF) strips, vintage laboratory alignment generators.