Tube-number record
33GY7-A
0 archive entries
33GY7-A is a tube type in the TubeDatabase archive (class: Compactron Diode-Pentode). Recorded specifications: brand General Electric, year 1966, construction Multi-section, socket Compactron, maximum plate voltage 400 V, and maximum plate dissipation 9 W. The archive does not yet hold a photographed example of this type.
BrandGeneral Electric
ClassCompactron Diode-Pentode
BaseCompactron
Filament33.6 V @ 450 mA
Construction
Primary TypeMulti-section
Rectifier TypeDamping Diode
EnvelopeT-12 Glass
SectionsTwo
Filament / Heater
Warm-up Time11s
Heater NotesSeries string operation
Absolute Maximum Ratings
Plate Voltage400 V
Plate Dissipation9 W
Grid 2 Voltage150 V
Grid 1 Voltage-55 V
Cathode Current155 mA
H-C Voltage200 V
Audio Performance
Key Features
- High-perveance diode
- Dimple anode construction to minimize snivets
- Unilaterally interchangeable with 33GY7
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode Section (Class A) | 130 V | 6500 | 10000 | 4 | 48 mA |
| Pentode Section (Zero Bias Low Plate) | 60 V | — | — | — | 320 mA |
Application Notes
Pentode intended for horizontal-deflection amplifier service; Diode intended for damping diode service.
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