Tube-number record
872-A / 872
0 archive entries
872-A / 872 is a tube type in the TubeDatabase archive (class: Mercury Vapor Rectifier). Recorded specifications: brand Eimac, construction Rectifier, socket 4-pin, and maximum plate voltage 10000 V. The archive does not yet hold a photographed example of this type.
BrandEimac
ClassMercury Vapor Rectifier
Base4-pin
Construction
Primary TypeRectifier
Rectifier TypeHalf-wave
EnvelopeT-18
SectionsSingle
Filament / Heater
MaterialCoated shielded ribbon
Warm-up Time30s
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Rectifier | — | — | — | — | — |
Application Notes
Mount vertically, base down. Initial installation requires 10 minutes filament operation without plate voltage. 30 seconds minimum warmup recommended for normal operation. Recommended condensed-mercury temperature is 40 degrees +/- 5 degrees C.
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