: I want to test a 2A3 on a tester with only octal sockets. Are there any tubes that are more common than the 6B4 with the same base type (only four pins in actual use)? Please email me at ChckAbra@aol.com.
: Many thanks
Besides the 6B4G, the 1E4, 1G4, and 1H4 have 5S basing. The 2A4G also does, but this is not a triode
per se.