6AU5GT
6AU5GT has no equivalent designation confirmed by the archive. Completed sales put the typical price at $5.22 per tube.
Description
The 6AU5GT is a vacuum tube with a unipotential cathode heater rated at 6.3 volts AC or DC.
Construction
Direct interelectrode capacitances are specified as follows: from grid No. 1 to plate, approximately 0.5 μμf; from grid No. 1 to cathode, grid No. 3, grid No. 2, and heater, approximately 11.3 μμf; and from plate to cathode, grid No. 3, grid No. 2, and heater, approximately 7 μμf.
Ratings
Maximum ratings include a plate voltage of 300 volts, a negative bias for grid No. 1 of 125 volts, a positive bias for grid No. 1 of 0 volts, a cathode current of 110 milliamperes, a total plate and grid No. 2 dissipation of 10 watts, a plate dissipation of 10 watts, and a grid No. 2 input of 2.5 watts. The peak heater-cathode voltage is 200 volts with the heater either negative or positive with respect to the cathode. The peak negative-pulse grid No. 1 voltage is 300 volts, and the peak cathode current is 400 milliamperes. The maximum grid No. 1 circuit resistance is 0.47 megohm. The maximum bulb temperature at the hottest point is 210 °C.
Applications
The 6AU5GT can be used in voltage regulator service with triode connection, where grid No. 2 is connected to plate. The datasheet specifies operation in a 525-line, 30-frame television system, noting that for television service the duration of the voltage pulse must not exceed 15 per cent of one horizontal scanning cycle, which equals 10 microseconds in that system.
| Measure | Per tube |
|---|---|
| Median | $5.22 |
| Typical range (25th–75th) | $4.01 – $6.99 |
| Most sales (10th–90th) | $3.60 – $15.05 |
| Extremes incl. outliers | $2.40 – $19.43 |
| Completed sales | 16 |
| Brand | Median | Range | Sales |
|---|---|---|---|
| GE | $6.27 | $4.85 – $15.05 | 8 |
| RCA | $5.56 | $4.75 – $6.50 | 4 |
| Condition | Median | Sales |
|---|---|---|
| NOS | $4.85 | 13 |
Per-tube prices from completed sales, 2026-06-29 to 2026-09-08. Matched pairs and quads are divided out. See the price index for how these move over time.
Original manufacturer datasheets for 6AU5GT, hosted by Frank Philipse's Electron Tube Data sheets.
| Manufacturer | Designation | Datasheet |
|---|---|---|
| RCA (HB3) | 6AU5GT | PDF (222 KB) |
| Tung-Sol | 6AU5GT | PDF (134 KB) |
Documents held here and used to write this page.
- OAUS CT