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PL509 PEC Rediffusion NOS with boxes (40KG6A)
PL509 PEC Rediffusion NOS with boxes (40KG6A)
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R 1,000.00 ZAR
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R 1,000.00 ZAR
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Overview of the PL509 Tube
- Primary Function: Originally designed as a TV timebase/line output pentode capable of handling high-voltage pulse spikes. [1, 2]
- Base Type: Magnoval (9-pin, B9D) with a top-cap anode connector. [1, 2]
- Heater Specifications: 40V at 0.3A (series working). [1]
- Anode Dissipation: Rated at 30 watts nominal anode dissipation, though widely repurposed by radio amateurs and audio hobbyists for short-wave RF power amplifiers (e.g., CB or amateur linear amplifiers) and OTL-style audio amplifiers. [1, 2, 3]
- Close Equivalents: The PL519 is a later, slightly beefier (35-watt) direct or near-equivalent often interchangeable in many line output or amplifier circuits. [1, 2]
Role in Rediffusion TVs
- Rediffusion television receivers (such as the 22-inch and 26-inch EHT tower chassis) housed high-voltage sections containing heavy-duty sweep and regulator valves, including the PL509, PY500, PD500, and EY501. [1, 2]
- Repair technicians noted that these Rediffusion chassis were generally tolerant of substituting a PL509 with a PL519 in the line output stage, though high-voltage/heater-cathode shorts could occasionally stress surrounding cathode-bias components. [1, 2]
Comparison of PL509 and Related Tubes
| Feature / Attribute | PL509 | PL519 | PL505 |
|---|---|---|---|
| Introduction Year | 1969 | 1970 | 1966 |
| Max Anode Dissipation | 30W | 35W | 25W |
| Heater Voltage / Current | 40V / 0.3A | 40V / 0.3A | 28V / 0.3A |
| Base | Magnoval B9D + Top Cap | Magnoval B9D + Top Cap | Magnoval B9D + Top Cap |
| Primary Rediffusion / TV Role | Line output stage (sweep tube) | Compatible upgrade/replacement | Early predecessor line output |
Product features
Product features
Materials and care
Materials and care
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