0B2WA
0B2WA has no equivalent designation confirmed by the archive. Completed sales put the typical price at $9.47 per tube.
Description
The 0B2WA is a cold cathode, gas-filled diode of miniature construction designed for service as a voltage regulator. It employs a cathode of the glow discharge type. The tube is designed for service where severe conditions of high temperature and mechanical shock or vibration are encountered.
Ratings and Characteristics
The 0B2WA has an operating current range of 5 to 30 milliamperes. It maintains a substantially constant operating voltage of 108 volts. Tube voltage drop varies with current: at 5 mAdc it is 105 Vdc minimum, 108 Vdc typical, and 111 Vdc maximum; at 20 mAdc it is 105 Vdc minimum and 111 Vdc maximum; at 30 mAdc it is 105 Vdc minimum, 109 Vdc typical, and 111 Vdc maximum. Regulation is ±1 Vdc typical and ±2.5 Vdc maximum.
Ionization voltage is 118 Vdc typical and 130 Vdc maximum at Ebb/Ib = 5–30 mAdc with illumination of 5–50 ft candles; under conditions of total darkness, ionization voltage is 123 Vdc typical and 130 Vdc maximum. Noise at Ebb/Ib = 30 mAdc has a maximum of 5 mVa. Leakage current at Eb = 50 Vdc and Rp = 3000 is less than 1 μAdd typical and 5 μAdd maximum. Voltage jump at Ebb/Ib = 6–10 mAdc is less than 10 mVd typical and 100 mVd maximum.
Application Notes
A series resistor must always be used with the 0B2WA. When a shunt capacitor is used, its maximum value should be limited to 0.1 μf. Three cathode pins are provided which may be used to disconnect the load when the tube is removed from the socket. The datasheet specifies a warm-up period of 3 minutes to insure minimum voltage drift.
Mechanical
The 0B2WA has base connections E7-1 and envelope outline No 6-5.
| Measure | Per tube |
|---|---|
| Median | $9.47 |
| Typical range (25th–75th) | $5.58 – $25.45 |
| Most sales (10th–90th) | $3.10 – $44.30 |
| Extremes incl. outliers | $2.50 – $44.37 |
| Completed sales | 15 |
| Brand | Median | Range | Sales |
|---|---|---|---|
| RCA | $6.00 | $4.99 – $16.79 | 5 |
| Sylvania | $9.74 | $9.47 – $14.00 | 4 |
| Condition | Median | Sales |
|---|---|---|
| NOS | $10.00 | 9 |
Per-tube prices from completed sales, 2026-06-11 to 2026-10-23. Matched pairs and quads are divided out. See the price index for how these move over time.
Original manufacturer datasheets for 0B2WA, hosted by Frank Philipse's Electron Tube Data sheets.
| Manufacturer | Designation | Datasheet |
|---|---|---|
| Raytheon | 0B2WA | PDF (466 KB) |
| CSF | 0B2WA | PDF (357 KB) |
| Philips | 0B2WA | PDF (332 KB) |
| Mazda-Belvu | 0B2WA | PDF (263 KB) |
Documents held here and used to write this page.
- Technical Information