6AH6A

Upgraded miniature 7-pin sharp-cutoff pentode engineered with tightly controlled heater warm-up intervals and a low-noise internal frame structure for premium commercial instruments. Equivalents: 6AH6, 6AH6V, 6485, CV2526. Real-Life Examples: Tektronix 511A oscilloscopes, classic Collins amateur radio receivers, commercial VHF line amplifiers.