Tube-number record
1727
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1727 is a tube type in the TubeDatabase archive (class: Electrometer Pentode). Recorded specifications: brand ROGERS, construction Pentode, and socket Subminiature. The archive does not yet hold a photographed example of this type.
BrandROGERS
ClassElectrometer Pentode
BaseSubminiature
Construction
Primary TypePentode
EnvelopeGlass
SectionsSingle
Filament / Heater
Absolute Maximum Ratings
Audio Performance
Key Features
- Subminiature
- Electrometer
- Logarithmic applications
- Triode connected
- Tinned leads
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Triode Connected (Test 1) | 12.5 V | — | — | — | — |
| Triode Connected (Test 2) | 13.5 V | — | — | — | — |
| Triode Connected (Test 3) | 11.5 V | — | — | — | — |
Application Notes
The tube is designed for logarithmic applications in electrometer circuits. Test circuit requires electrostatic shielding and a light-tight box. Current source levels are extremely low (picoampere to nanoampere range).
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