6AS7G
6AS7G has no equivalent designation confirmed by the archive. Completed sales put the typical price at $15.00 per tube.
The 6AS7G is a high-current, twin power triode widely used in electronically regulated power supplies, particularly as a passing tube or series regulator in controlled power supplies. Its high perveance permits it to pass large currents at low plate voltages, and it exhibits high transconductance at relatively low plate voltages.
Ratings
The maximum plate voltage (DC) is 275 volts, and the maximum plate current per plate (DC) is 125 mA. Maximum power dissipation per plate is 14 watts. Maximum envelope temperature is 200 degrees Celsius, and maximum altitude for full ratings is 10,000 feet. Maximum heater-cathode voltage is −300 to +300 volts. The maximum grid circuit resistance is 1.0 megohm for cathode bias operation and 0.1 megohm for fixed bias or combination fixed and cathode bias operation.
Characteristics
Per triode section, transconductance is 7000 micromhos and amplification factor is 2.0. Inter-electrode capacitances per triode section are 6.2 μμf from grid to cathode, 8.4 μμf from grid to plate, 2.2 μμf from cathode to plate, and 7.0 μμf from heater to cathode. Between sections, capacitance is 0.9 μμf from section 1 grid to section 2 grid and 2.2 μμf from section 1 plate to section 2 plate. The dual triode sections can be paralleled to provide desired output current.
Heater
The heater voltage is 6.3 volts, with a range of 5.7 to 6.9 volts. Heater current is 2.5 amperes at 6.3 volts. Minimum cathode heating time is 30 seconds; the datasheet recommends a thirty-second cathode warmup time before plate voltage is applied.
Mechanical
The bulb type is ST-16, and the base is medium shell octal 8-pin. Average net weight is 2.5 ounces. Maximum vibration rating is 2.5 G. The tube can be mounted in any position.
Application Notes
The datasheet recommends a grid resistor of 1,000 ohms for each triode section.
| Measure | Per tube |
|---|---|
| Median | $15.00 |
| Typical range (25th–75th) | $9.38 – $22.34 |
| Most sales (10th–90th) | $6.11 – $39.57 |
| Extremes incl. outliers | $1.11 – $231.49 |
| Completed sales | 85 |
| Brand | Median | Range | Sales |
|---|---|---|---|
| RCA | $16.59 | $9.38 – $20.44 | 33 |
| GE | $14.98 | $8.46 – $18.73 | 19 |
| Sylvania | $19.49 | $12.59 – $29.50 | 8 |
| Raytheon | $13.34 | $11.38 – $13.86 | 6 |
| Condition | Median | Sales |
|---|---|---|
| NOS | $17.50 | 35 |
| used | $14.61 | 31 |
Per-tube prices from completed sales, 2026-07-07 to 2026-10-22. Matched pairs and quads are divided out. See the price index for how these move over time.
Original manufacturer datasheets for 6AS7G, hosted by Frank Philipse's Electron Tube Data sheets.
| Manufacturer | Designation | Datasheet |
|---|---|---|
| Tung-Sol | 6AS7G | PDF (266 KB) |
| RCA (HB3) | 6AS7G | PDF (144 KB) |
Documents held here and used to write this page.
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2 further designations appear alongside 6AS7G in the literature but below the evidence threshold used here, so they are not listed as equivalent.