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Tubes Pentodes Platinum Matched (Matched Quad)
These Tung-Sol EL34B high voltage pentode tubes feature a beautiful design, using high quality materials. They have a high impedance with an increased reactivity. They can also be used to replace 6CA7 tubes. In addition, these four tubes are matched to provide the best performance.
| # Pin | Electrode name |
| 1 | Grid 3 |
| 2, 7 | Heater |
| 3 | Plate |
| 4 | Grid 2 |
| 5 | Grid 1 |
| 6 | NC |
| 8 | Cathode |
| Specifications | |
|---|---|
| Product type | Tubes |
| Tubes type | Pentode |
| Number of pins | 7 |
| Quantity | 4 Matched tubes |
| Measurements | |||
|---|---|---|---|
| Parameter | Conditions | Min. | Max. |
| First grid reverse current | Filament voltage 6.3V, plate voltage 250V, first grid voltage minus 13.5V, second grid voltage 265V, first grid circuit resistance 0.51MΩ | - | 1.5µA |
| Heater current | - | 1.35A | 1.65A |
| Plate current | Filament voltage 6.3V, plate voltage 250V, first grid voltage minus 13.5V, second grid voltage 265V | 80mA | 130mA |
| Second grid current | Filament voltage 6.3V, plate voltage 250V, first grid voltage minus 13.5V, second grid voltage 265V | 10mA | 20mA |
| Output power | Filament voltage 6.3V, plate voltage 250V, first grid voltage minus 13.5V, second grid voltage 265V, plate circuit resistance 2kΩ | 8.5W | - |
| First grid cut-off voltage, negative | Filament voltage 6.3V, plate voltage 250V, second grid voltage 265V | - | 38V |
| Distortion factor | Filament voltage 6.3V, plate voltage 265V, first grid voltage minus 13.5V, second grid voltage 265V, plate circuit resistance 2kΩ | - | 13.5% |
| Cathode - Heater insulation resistance | Filament voltage 6.3V, cathode heater ±100V | 2MΩ | - |
| Limit values | ||
|---|---|---|
| Parameter | Min. | Max. |
| Filament voltage | 5.5V | 7V |
| Cathode - Heater voltage | - | ±100V |
| Cathode current | - | 150mA |
| Plate dissipation power | - | 25W |
| Second grid dissipation factor | - | 8W |
| first grid circuit resistance, fixed bias | - | 0.5MΩ |
| first grid circuit resistance, self bias | - | 0.7MΩ |
| Temperature at the most heated part of the envelope | - | 523K° |
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