6BX7GT
6BX7GT has no equivalent designation confirmed by the archive. Completed sales put the typical price at $16.31 per tube.
The 6BX7GT is a high-transconductance twin triode with coated unipotential cathodes, designed primarily for use as a combined vertical deflection amplifier and vertical oscillator in television receivers.
Construction
The tube uses a T-9 glass envelope and a B8-58 short intermediate shell Octal 8-pin base. The heater is rated for 6.3 volts AC or DC at 1.5 amperes, and the heater pins are 7 and 8. The tube may be mounted in any position.
Each of the two sections uses separate pins: section 1 connects to the grid on pin 4, plate on pin 5, and cathode on pin 6; section 2 connects to the grid on pin 1, plate on pin 2, and cathode on pin 3.
Ratings
Each section has a maximum DC plate voltage of 500 volts, with an absolute maximum peak positive pulse plate voltage of 2000 volts. Maximum positive DC grid voltage is 0 volts, and maximum peak negative grid voltage is −500 volts. Plate dissipation is limited to 10 watts per plate, with a combined maximum of 12 watts for both plates. Maximum average cathode current is 60 milliamperes, and maximum peak cathode current is 180 milliamperes.
Heater-cathode voltage limits are 200 volts total DC and peak when the heater is negative with respect to the cathode; when the heater is positive with respect to the cathode, the DC component is limited to 100 volts and the total DC and peak to 200 volts.
Capacitances
Direct interelectrode capacitances for section 1 are 4.2 micromicrofarads grid-to-plate, 4.4 micromicrofarads input, and 1.1 micromicrofarads output. For section 2, they are 4.0 micromicrofarads grid-to-plate, 4.8 micromicrofarads input, and 1.2 micromicrofarads output. Grid-to-grid capacitance is 0.11 micromicrofarads, and plate-to-plate capacitance is 1.5 micromicrofarads.
Application Notes
When used as a combined vertical deflection amplifier and oscillator, the datasheet recommends section 1 (pins 4, 5, and 6) as the oscillator. An adequate cathode bias resistor or other suitable means is required to protect the tube in the absence of excitation. The datasheet states that the tube is capable of withstanding high pulse voltages normally encountered in vertical deflection amplifier applications and, when operated from relatively low plate supply voltages, is capable of deflecting fully large-deflection-angle picture tubes.
| Measure | Per tube |
|---|---|
| Median | $16.31 |
| Typical range (25th–75th) | $12.46 – $19.33 |
| Most sales (10th–90th) | $9.53 – $24.50 |
| Extremes incl. outliers | $4.83 – $68.16 |
| Completed sales | 38 |
| Brand | Median | Range | Sales |
|---|---|---|---|
| RCA | $18.06 | $12.50 – $24.33 | 12 |
| GE | $16.73 | $14.49 – $18.00 | 9 |
| Sylvania | $16.31 | $14.95 – $20.00 | 8 |
| Condition | Median | Sales |
|---|---|---|
| NOS | $17.90 | 25 |
| used | $12.46 | 9 |
Per-tube prices from completed sales, 2026-07-15 to 2026-09-20. Matched pairs and quads are divided out. See the price index for how these move over time.
Original manufacturer datasheets for 6BX7GT, hosted by Frank Philipse's Electron Tube Data sheets.
| Manufacturer | Designation | Datasheet |
|---|---|---|
| General Electric | 6BX7GT | PDF (327 KB) |
| Tung-Sol | 6BX7GT | PDF (75 KB) |
Documents held here and used to write this page.
- 6BX7-GT Description and Rating