6AT6
6AT6 is also designated EBC90. Completed sales put the typical price at $10.99 per tube.
The 6AT6 is an indirectly heated miniature double diode triode, combining a high-mu triode unit and a diode unit with a common cathode. It is mounted in a standard T5½ bulb and uses a B.V.A. standard base type B7G.
Construction
The triode and diode units are separate but share a common cathode. The Brimar datasheet gives the base connections as: Pin 1 triode grid, Pin 2 cathode and shield, Pin 3 heater, Pin 4 heater, Pin 5 diode anode 2, Pin 6 diode anode 1, Pin 7 triode anode.
Ratings
The Brimar datasheet states a heater voltage of 6.3 volts and a heater current of 0.3 amperes. The maximum DC heater-cathode potential is 250 volts. The triode unit has a maximum anode voltage of 300 volts and a maximum anode dissipation of 1.0 watt. The diode unit has a maximum anode current of 1.0 mA. The maximum overall length is 2-1/8 inches, the maximum diameter is 3/4 inch, and the maximum seated height is 1-19/32 inches.
Characteristics
At an anode voltage of 100 volts and grid voltage of -1 volt, the triode unit has an amplification factor of 70, an anode impedance of 54,000 ohms, a mutual conductance of 1.3 mA/V, and an anode current of 0.8 mA. At an anode voltage of 250 volts and grid voltage of -3 volts, the amplification factor is 70, the anode impedance is 58,000 ohms, the mutual conductance is 1.2 mA/V, and the anode current is 1.0 mA.
Applications
The Brimar datasheet states the 6AT6 is intended for use as a second detector in superheterodyne receivers and is very suitable for use as a resistance coupled amplifier. The diodes may be employed as signal rectifiers in either full-wave or half-wave circuits if required.
| Designation | Evidence | Confidence |
|---|---|---|
| EBC90 | 51 independent documents | confirmed |
Equivalence is asserted only where the archive's own literature states it directly, in at least 40 separate documents. Tubes that merely substitute in some circuits are not listed here.
| Measure | Per tube |
|---|---|
| Median | $10.99 |
| Typical range (25th–75th) | $8.98 – $14.60 |
| Most sales (10th–90th) | $4.62 – $19.45 |
| Extremes incl. outliers | $3.30 – $33.87 |
| Completed sales | 35 |
| Brand | Median | Range | Sales |
|---|---|---|---|
| RCA | $11.07 | $9.09 – $14.02 | 11 |
| GE | $9.99 | $9.12 – $12.47 | 5 |
| Sylvania | $14.62 | $7.50 – $19.95 | 3 |
| Tung-Sol | $10.70 | $10.25 – $15.73 | 3 |
| Condition | Median | Sales |
|---|---|---|
| NOS | $11.67 | 25 |
| used | $10.20 | 8 |
Per-tube prices from completed sales, 2026-06-24 to 2026-09-19. Matched pairs and quads are divided out. See the price index for how these move over time.
Original manufacturer datasheets for 6AT6, hosted by Frank Philipse's Electron Tube Data sheets.
| Manufacturer | Designation | Datasheet |
|---|---|---|
| Brimar | 6AT6 | PDF (974 KB) |
| General Electric | 6AT6 | PDF (416 KB) |
| Tung-Sol | 6AT6 | PDF (176 KB) |
| RCA (HB3) | 6AT6 | PDF (140 KB) |
| Brimar | 6AT6 | PDF (84 KB) |
| Mullard | EBC90 | PDF (83 KB) |
Documents held here and used to write this page.
- BRIMAR
- 4520 (filed under EBC90)