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 collector's special four pin tube. It is useful in many older instruments, special circuits, VTVMs, old time receivers, transmitters and transcievers. Excellent for those antique radio, instrument restoration projects or to set up a private vacuum tube museum. This is a NOS (New Old Stock) is unused, kept for all these years in mint condition.

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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 • High quality Made in USA Notes: • NOS - New Old Stock tube in original box • Unused - Price: $50 - One available • S/H included within continental US

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