Tube-number record
DY87
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BrandPhilips
ClassRectifier
BaseNoval (B9A)
Filament1.4 V @ 550 mA
Construction
Primary TypeOther / special
Rectifier TypeSingle-anode
EnvelopeChemically treated glass
Sections1
Filament / Heater
Heater NotesIndirectly heated by A.C. or D.C.; Parallel supply
Absolute Maximum Ratings
Plate Voltage22000 V
Cathode Current0.8 mA
Audio Performance
Key Features
- Chemically treated envelope to avoid flash-over
- Suitable for high humidity and low atmospheric pressure (45 cm Hg)
- Anti-corona ring mounting capability
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| E.H.T. Supply | 18000 V | — | 20000 | — | 0.15 mA |
Application Notes
Heater voltage should be adjusted to 1.4V at 200 µA output current. Pins 3 and 7 must never be earthed and may be connected to heater potential components. Use insulating cover for metal top-cap at high voltage/humidity to avoid corona.
Datasheets
Datasheet: DY87.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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