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ELECTRO-HARMONIX 300B Tubes Triodes (Matched Pair)
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Electro-Harmonix 300B
Tubes Triodes Platinum Matched (Matched pair)
The Electro-Harmonix 300B tube offers long life, high quality design and incredible sonic capabilities. Like the original Western Electric 300B, it features a direct heated 8-track filament with 40W plate dissipation and a large glass. The 300B's plate curves and DC static characteristics also match those of the original, ensuring excellent performance.
The Electro-Harmonix 300B tube is sold here as a matched pair, to ensure the best possible performance.
Technical characteristics
| Specifications | |
|---|---|
| Product type | Tubes |
| Tube type | Triode |
| Number of pins | 4 |
| Dimensions | Ø61.5 x 152mm |
| Electrical parameters | |||
|---|---|---|---|
| Parameter | Condition | Min. | Max. |
| Heater current | - | 1.1A | 1.4A |
| Grid reverse current | Filament voltage = 5V Plate voltage = 450V Grid voltage minus = 97V Resistance in grid circuit = 0.51MΩ | - | 1µA |
| Plate current | Filament voltage = 5V Plate voltage = 303V Grid voltage minus = 58V | 45mA | 90mA |
| Amplification factor | Filament voltage = 5V Plate voltage = 303V Grid voltage minus = 58V | 3 | - |
| Dissipation factor | Filament voltage = 5V Plate voltage = 303V Grid voltage minus = 58V Plate circuit resistance = 2.4kΩ | - | 10% |
| Output power | Filament voltage = 5V Plate voltage = 303V Grid voltage minus = 58V Plate circuit resistance = 2.4kΩ | 5.5W | - |
| Limit values | ||
|---|---|---|
| Parameter | Min. | Max. |
| Filament voltage | 4.5V | 5.5V |
| Plate voltage | - | 450V |
| Cathode current | - | 100V |
| Power dissipation at the plate of each triode | - | 40W |
| Grid voltage, negative | - | 220V |
| Grid circuit resistance | - | Fixed bias : 0.51MΩ Self bias : 1MΩ |
| Temperature at the most heated part of the envelope | - | 473K° |
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