5814
5814 has no equivalent designation confirmed by the archive. Completed sales put the typical price at $25.60 per tube.
The 5814 is a nine-pin miniature medium-mu twin triode with individual cathode connections for each section, housed in a T-6½ glass envelope.
Construction
The 5814 uses a coated unipotential cathode. It incorporates distinctive mechanical design features and increased heater current, which provides a safety factor in cathode performance. The tube is designed to be sturdy and shock-resistant, offering long life under conditions of intermittent operation. It can be mounted in any position.
Ratings
Maximum plate voltage ratings are 300 volts design-center and 330 volts absolute. Maximum cathode current per section is 20 milliamperes design-center and 22 milliamperes absolute. Maximum plate dissipation per section is 2.75 watts design-center and 3.03 watts absolute. Maximum peak heater-cathode voltage is 90 volts design-center and 100 volts absolute, with the heater either negative or positive with respect to the cathode.
Electrical Characteristics
Average characteristics are measured at a plate voltage of 250 volts, with each triode section operating with heaters connected in parallel. In typical Class A1 amplifier operation at 250 volts plate voltage, the amplification factor is 17, plate resistance is 7700 ohms, transconductance is 2200 micromhos, and plate current is 10.5 milliamperes. At 100 volts plate voltage, the amplification factor is 19.5, plate resistance is 6250 ohms, and plate current is 11.8 milliamperes.
Capacitances
Direct interelectrode capacitance from grid to plate is 1.5 µµF for both sections. Input capacitance is 1.6 µµF for both sections. Output capacitance is 0.50 µµF for section number 1 and 0.35 µµF for section number 2.
Base Connections
Pin 1 is the plate of section 2, pin 2 is the grid of section 2, and pin 3 is the cathode of section 2. Pins 4 and 5 are heater pins, and pin 9 is the heater center-tap. Pin 6 is the plate of section 1, pin 7 is the grid of section 1, and pin 8 is the cathode of section 1.
| Measure | Per tube |
|---|---|
| Median | $25.60 |
| Typical range (25th–75th) | $13.60 – $43.18 |
| Most sales (10th–90th) | $5.22 – $78.32 |
| Extremes incl. outliers | $0.65 – $703.20 |
| Completed sales | 237 |
| Brand | Median | Range | Sales |
|---|---|---|---|
| GE | $21.17 | $13.54 – $37.49 | 52 |
| Sylvania | $23.59 | $12.90 – $43.18 | 51 |
| RCA | $32.30 | $22.18 – $49.00 | 51 |
| Raytheon | $33.33 | $14.67 – $46.50 | 19 |
| Philips | $14.29 | $8.00 – $24.00 | 10 |
| Tung-Sol | $22.17 | $19.00 – $27.50 | 5 |
| Amperex | $22.00 | $3.77 – $45.77 | 3 |
| Westinghouse | $31.99 | $24.00 – $57.15 | 3 |
| Condition | Median | Sales |
|---|---|---|
| NOS | $34.36 | 98 |
| used | $17.75 | 73 |
Per-tube prices from completed sales, 2026-02-13 to 2026-11-08. Matched pairs and quads are divided out. See the price index for how these move over time.
Original manufacturer datasheets for 5814, hosted by Frank Philipse's Electron Tube Data sheets.
| Manufacturer | Designation | Datasheet |
|---|---|---|
| Sylvania | 5814 | PDF (232 KB) |
Documents held here and used to write this page.
- TWIN TRIODE