B7A, Ceramic Valve Bases, B7A, Ceramic, Valve Bases, 829B, 832B, 6C33C, 826, TM-30, GU19, TT25, QQV06-40, NEW, NOS
B7A, CERAMIC VALVE BASES, B7A, CERAMIC, VALVE BASES, 829B, 832B, 6C33C, 826, TM-30, GU19, TT25, QQV06-40, NEW, NOS0,
The B7A base was mainly used for transmitting double beam tetrodes. Pin 4 has a larger diameter than the rest and acts as a locating aid as the pins are equi-spaced around the pin circle.
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AIR MINISTRY, B3G, VALVE BASE, MARKED 10H/459, FOR 3-PIN INLINE LEAD GLASS VALVE SUCH AS EA50