7868
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BrandSylvania
ClassPower Pentode
BaseNovar
Filament6.3V @ 800mA
Construction
Primary TypePentode
EnvelopeT-9
Base MaterialSmall Button Novar 9-Pin
SectionsSingle
Filament / Heater
Heater NotesParallel Operation
Absolute Maximum Ratings
Plate Voltage550 V
Plate Dissipation19 W
Grid 2 Voltage440 V
Cathode Current90 mA
H-C Voltage200 V
Audio Performance
Typical THD5%
Power Output44 W
Key Features
- 9-pin Novar base
- High fidelity audio amplifier utility
- Low distortion
- Relatively high power output
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Pentode Single-Ended Class A1 | 300V | 10200 | 29000 | - | 60mA |
| Pentode Push-Pull Class AB1 | 450V | - | - | - | 40mA |
| Ultra-Linear Operation Push-Pull | 400V | - | - | - | 60mA |
Application Notes
Two 7868's can deliver 44 watts power output with 5% THD in push-pull class AB1. For efficient operation, Grid No. 2 connections (Pins 1 and 7) should be tied together.
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