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931 Beckman Electrometer Tetrode Sylvania 1229 Type 32 Derivative Vacuum Tube

This is an original 931 Beckman Electrometer Tetrode replacement tube originally a Sylvania 1229 derivative based on the Type 32 vacuum tube and selected for lowest grid current with additional shielding added. This is a rare, hard to find, classic four pin tube. It is useful in many older instruments, special circuits, VTVMs, old time receivers, transmitters and transcievers. Useful for antique radio, instrument restoration projects or to set up a private vacuum tube museum.
931 Beckman Electrometer Tetrode Sylvania 1229 Type 32 Derivative Vacuum Tube [4 KB]
HISTORICAL TECHNICAL COLLECTIBLE

Features:

931 Beckman Electrometer Tube
MFG: Sylvania - 1229 Tetrode Derivative
Low grid current selection
Electrometer instrument applications
Filament: 2 V, 60 mA
Plate: 180 VDCmax
Base: 4-pin Discontinued Collectible Tube
High quality Made in USA

Notes:

Unused Price: $20 One available Without box
S/H included within continental US
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