6S7B, 6S7B-V
Low-frequency voltage amplification triodes.
Housing - glass casing, super miniaturized. Weight is 3.5 grams.
Basic specifications
at Ul = 6.3 V, Ua = 250 V, Rc = 400 Ohm
| 6S7B | 6S7B-V | |
| Heating current, mA | 200±20 | 200±20 |
| Anode current, mA | 4.5±1.3 | 4.5±1.3 |
| Reverse grid current, μA | ≤0.2 | ≤0.2 |
| Leakage current between cathode and heater, μA | ≤20 | ≤20 |
| Slope characteristics, mA/V | 4±0.9 | 40.2±0.9 |
| The same at Ui = 5.7 V | ≥2.6 | ≥2.8 |
| Amplification ratio | 65 +20 / -13 | 70 +15 / -13 |
| Vibration noise voltage(at Rа = 2 kOhm), mV | ≤150 | ≤175 |
| Inter-electrode capacitance, pF: | ||
| input | 3.3±0.9 | 3.3±0.9 |
| output | 3.4±0.9 | 3.4±0.9 |
| passing | ≤1 | ≤1 |
| cathode – heater | 3.8 – 7 | ≤7 |
| Service life, h | ≥1500 | ≥1500 |
| Evaluation criteria: | ||
| reverse grid current, μA | ≤1 | ≤1 |
| Slope characteristics, mA/V | ≥2.65 | ≥2,85 |
| Relative change in slope, % | – | ≤ +30/-40 |
Operational limits
| 6S7B | 6S7B-V | |
| Heating voltage, V | 5.7 – 6.9 | 5.7 – 6.9 |
| Anode voltage, V | 300 | 300 |
| The same with closed lamp | 350 | 350 |
| Negative grid voltage, V | 50 | 50 |
| Voltage between cathode and heater, V | 150 | 150 |
| Cathode current, mA | 7 | 7 |
| Power dissipated by anode, W | 1.45 | 1.45 |
| Resistance in the grid circuit, MOhm | 1 | 1 |
| Bulb temperature of the lamp, °C | 170 | 170* |
| Resilience to external influences | ||
| Acceleration during vibration g | 10 | 10 |
| * in frequency range, Hz | 10 – 300 | 5 – 600 |
| acceleration during multiple shocks g | 10 | 150 |
| acceleration during single shocks g | – | 500 |
| Steady acceleration g | 25 | 100 |
| operating environment temperature range, °C | from –60 to +90 | from –60 to +200 |
* For the 6S7B-V lamp at an ambient temperature of 200°C, a maximum bulb temperature of 250°C is allowed.
