Tube-number record
A2521
0 archive entries
A2521 is a tube type in the TubeDatabase archive (class: UHF Grounded Grid Triode). Recorded specifications: brand The M-O Valve Company Limited, construction Triode, socket Noval (B9A), maximum plate voltage 250 V, and maximum plate dissipation 2.5 W. The archive does not yet hold a photographed example of this type.
BrandThe M-O Valve Company Limited
ClassUHF Grounded Grid Triode
BaseNoval (B9A)
Filament6.3 V @ 0.3 mA
Construction
Primary TypeTriode
EnvelopeTubular
Sectionssingle
Filament / Heater
Heater NotesCV2453 variant uses 0.37 A
Absolute Maximum Ratings
Plate Voltage250 V
Plate Dissipation2.5 W
Grid 1 Voltage-20 V
Cathode Current25 mA
H-C Voltage100 V
Audio Performance
Key Features
- Low noise amplifier
- Small power amplifier
- Frequency multiplier
- Grounded grid circuit
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Characteristics | 130 V | 15000 | 4000 | 60 | 16 mA |
| Class A Grounded Grid Amplifier 200MHz | 180 V | — | — | — | 16 mA |
Application Notes
The valve may be mounted in any position. If a screening can is used it should be blackened inside and out.
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