https://en.wikipedia.org/wiki/6AQ5
Other close or equivalent tube types are: 6HG5, 6HR5, 6669, 6BM5, N727, CV1862 and the Tesla 6L31. The 6CM6,[6] like the Russian 6P1P (6П1П),[7] while electrically equivalent (up to 250 V anode voltage), have a 9 pin (B9A) base. Another similar, but not identical, amplifier pentode with a miniature 9-Pin base (B9A), used in consumer electronics was the 6M5.