7543
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BrandSylvania
ClassPentode
BaseMiniature Button 7-Pin
Filament6.3V @ 300mA
Construction
Primary TypePentode
EnvelopeT-5 1/2
SectionsSingle
Filament / Heater
Heater NotesHelical wound heater
Absolute Maximum Ratings
Plate Voltage300 V
Plate Dissipation3 W
Grid 2 Voltage300 V
H-C Voltage200 V
Audio Performance
Key Features
- Low hum
- Non-microphonic operation
- Helical wound heater
- Rigid mounting
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| Triode Connected | 250V | 4800 | - | 36 | 12.2mA |
| Pentode Connected (100V G2) | 100V | 3900 | 500000 | - | 5mA |
| Pentode Connected (125V G2) | 250V | 4500 | 1500000 | - | 7.6mA |
| Pentode Connected (150V G2) | 250V | 5200 | 1000000 | - | 10.6mA |
Application Notes
The hum level at the plate averages 1.2 millivolts when used as a normal voltage amplifier with a stage gain of 340 and the 6.3 Vac heater supply balanced to ground.
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