6922
6922 is also designated E88CC. Completed sales put the typical price at $52.49 per tube.
Construction
The 6922 is a twin triode using frame grid construction, which allows closer grid to cathode spacing and thus higher transconductance values.
Ratings
The datasheet gives a maximum bulb temperature of 70 °C. The heater voltage rating is 6.3 V with a range from 6.0 V to 6.6 V. Heater current ranges from 285 to 315 mA, with a typical value of 300 mA. The heater-cathode voltage range is -135 V to +70 V.
Under normal test conditions, the plate supply voltage is 100 Vdc, with a maximum of 250 Vdc. The grid voltage is +9 Vdc, and the cathode resistance is 680 ohms under normal test conditions. Maximum plate dissipation per plate is 1.65 W. Maximum cathode current per cathode is 22 mAdc. Maximum fixed grid resistance is 0.5 megohm; for cathode bias operation, maximum grid resistance is 1.0 megohm.
Characteristics
Measured at Ebb=91 Vdc, Ec=0, Rk=80 ohms, plate current ranges from 11.6 to 18.9 mAdc, with a typical value of 15.2 mAdc. Transconductance ranges from 10,000 to 15,000 micromhos, with a typical value of 12,500 micromhos. Transconductance change is up to 15 percent when Ef is changed to 5.7 V. Amplification factor ranges from 26.5 to 39.5, with a typical value of 33.
Mechanical and Environmental Testing
The datasheet gives a maximum vibration output of 100 mVac at F=25 cps, G=2.5, Rp=2000, Ck=1000. It specifies a maximum impact acceleration of 50 G for the shock test and a maximum vibrational acceleration of 2.5 G for the 96 hour fatigue test. The datasheet specifies that tubes shall be marked 'USN 6922'.
| Designation | Evidence | Confidence |
|---|---|---|
| E88CC | 81 independent documents | strong |
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 | $52.49 |
| Typical range (25th–75th) | $29.99 – $99.99 |
| Most sales (10th–90th) | $11.75 – $183.99 |
| Extremes incl. outliers | $1.14 – $459.48 |
| Completed sales | 268 |
| Brand | Median | Range | Sales |
|---|---|---|---|
| Amperex | $70.00 | $50.00 – $125.00 | 57 |
| Siemens | $93.00 | $67.50 – $163.82 | 25 |
| Philips | $55.42 | $39.99 – $111.47 | 19 |
| Tesla | $56.00 | $54.99 – $165.00 | 12 |
| Telefunken | $213.34 | $182.00 – $262.30 | 10 |
| Sylvania | $24.95 | $17.78 – $99.99 | 7 |
| GE | $82.50 | $77.95 – $101.26 | 6 |
| Sovtek | $26.98 | $15.41 – $30.00 | 6 |
| RCA | $48.92 | $43.70 – $51.99 | 5 |
| Electro-Harmonix | $26.73 | $23.50 – $43.33 | 4 |
| Mullard | $49.99 | $22.48 – $151.99 | 3 |
| JJ | $32.20 | $27.95 – $37.95 | 3 |
| Condition | Median | Sales |
|---|---|---|
| NOS | $49.99 | 163 |
| used | $55.40 | 58 |
| current | $31.08 | 12 |
Per-tube prices from completed sales, 2020-09-25 to 2026-10-17. Matched pairs and quads are divided out. See the price index for how these move over time.
Original manufacturer datasheets for 6922, hosted by Frank Philipse's Electron Tube Data sheets.
| Manufacturer | Designation | Datasheet |
|---|---|---|
| RCA (HB3) | 6922 | PDF (91 KB) |
| Tesla | E88CC | PDF (1704 KB) |
| Philips | E88CC | PDF (1526 KB) |
| Siemens | E88CC | PDF (574 KB) |
| Philips | E88CC | PDF (515 KB) |
| Telefunken | E88CC | PDF (379 KB) |
| JJ | E88CC | PDF (353 KB) |
| AEG | E88CC | PDF (327 KB) |
Documents held here and used to write this page.
- Technical Information
- Bručení: (filed under E88CC)