01A
01A has no equivalent designation confirmed by the archive. Completed sales put the typical price at $27.48 per tube.
Description
The 01A is a three-electrode storage battery tube for use as a detector and as an amplifier. It has an S-14 bulb with a medium 4-pin base, and its base pins fit the standard four-contact socket. The maximum overall length is 4 11/16 inches.
Construction and Ratings
The filament requires 5.0 volts DC and draws 0.25 amperes. It is intended for operation from a 6-volt storage battery, with a resistor to reduce the voltage to 5.0 volts. The amplification factor is 8. The grid-plate capacitance is 8.1 μμf, and the plate-to-filament capacitance is 3.1 μμf.
Applications
As a detector, the 01A may be operated with grid leak and condenser or with grid bias. For grid leak and condenser detection, the recommended plate voltage is 45 volts. For grid bias detection, plate voltages up to 135 volts may be used with a corresponding negative grid bias of approximately 13.5 volts.
As an amplifier, the 01A is applicable to audio or radio-frequency stages of a receiver. When used as a radio-frequency amplifier, little is gained from plate voltages exceeding 90 volts. The 01A is well adapted for use as an interstage audio-frequency amplifier.
| Measure | Per tube |
|---|---|
| Median | $27.48 |
| Typical range (25th–75th) | $17.52 – $39.44 |
| Most sales (10th–90th) | $12.50 – $59.99 |
| Extremes incl. outliers | $6.12 – $124.47 |
| Completed sales | 85 |
| Brand | Median | Range | Sales |
|---|---|---|---|
| RCA | $37.50 | $27.48 – $40.90 | 29 |
| Sylvania | $12.91 | $12.50 – $15.84 | 5 |
| Condition | Median | Sales |
|---|---|---|
| NOS | $41.31 | 10 |
| used | $29.99 | 47 |
Per-tube prices from completed sales, 2026-06-30 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 01A, hosted by Frank Philipse's Electron Tube Data sheets.
| Manufacturer | Designation | Datasheet |
|---|---|---|
| RCA (HB3) | 01A | PDF (103 KB) |
| Sylvania | 01A | PDF (36 KB) |
Documents held here and used to write this page.
- 01A