The 14H7 is a vari-μ RF pentode for use at RF and IF. The heater is suitable for both parallel and series connection and thus the 14H7 can be used in universal sets as well as AC only products. The 7H7 has a 6.3 volt heater at 0.3 Amp.
Electrically the 14H7 on the Loctal base is equal to the octal based 12SG7.
The American made valve carries the Sylvania name.
The B8B base showing the short pins, locking spigot, keyway and locating pip on the metal skirt.
Thanks to Mark Mallison for sending the images.
The all glass envelope is mm in diameter and, excluding the footless base pins, is mm tall.
References: Data-sheet & Data. Type 14H7 was first introduced in 1941. See also1941 adverts.
