6J5
6J5 is also designated 6J5GT. Completed sales put the typical price at $17.95 per tube.
The 6J5 is a general-purpose triode designed for use as a detector, amplifier, or oscillator, employing a coated unipotential cathode. It is constructed with an MT-8 metal shell envelope and a B6-23 small wafer octal 6-pin base. The tube has high transconductance and a medium amplification factor, and is well suited to resistance-coupled service, having high output voltage capabilities. It may be mounted in any position.
Construction
The 6J5 heater requires 6.3 volts AC or DC at 0.3 ampere. Pin assignments are: pin 1, shell; pin 2, heater; pin 3, plate; pin 5, grid; pin 7, heater; and pin 8, cathode.
Ratings
Maximum ratings include a plate voltage of 300 volts, a positive DC grid voltage of 0 volts, a plate dissipation of 2.5 watts, a cathode current of 20 milliamperes, a heater-cathode voltage of 90 volts, and a grid circuit resistance of 1.0 megohm.
Characteristics
The 6J5 has a grid-to-plate capacitance of 3.4 micromicrofarads, an input capacitance of 3.4 micromicrofarads, and an output capacitance of 3.6 micromicrofarads. Typical operating conditions as a class A amplifier include a plate voltage of 250 volts, a grid voltage of -8 volts, a plate current of 9.0 milliamperes, a plate resistance of approximately 7700 ohms, and a transconductance of 2600 micromhos. The amplification factor is given as 20.
| Designation | Evidence | Confidence |
|---|---|---|
| 6J5GT | 40 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 | $17.95 |
| Typical range (25th–75th) | $9.80 – $27.01 |
| Most sales (10th–90th) | $6.95 – $37.49 |
| Extremes incl. outliers | $3.27 – $44.88 |
| Completed sales | 27 |
| Brand | Median | Range | Sales |
|---|---|---|---|
| RCA | $12.72 | $9.80 – $17.95 | 8 |
| Raytheon | $36.50 | $27.01 – $37.50 | 3 |
| Condition | Median | Sales |
|---|---|---|
| NOS | $22.85 | 12 |
| used | $15.21 | 12 |
Per-tube prices from completed sales, 2026-07-12 to 2026-09-24. Matched pairs and quads are divided out. See the price index for how these move over time.
Original manufacturer datasheets for 6J5, hosted by Frank Philipse's Electron Tube Data sheets.
| Manufacturer | Designation | Datasheet |
|---|---|---|
| General Electric | 6J5 | PDF (309 KB) |
| Tung-Sol | 6J5 | PDF (212 KB) |
| RCA (HB3) | 6J5 | PDF (195 KB) |
| RCA | 6J5 | PDF (136 KB) |
| RFT | 6J5 | PDF (65 KB) |
| Sylvania | 6J5 | PDF (61 KB) |
Documents held here and used to write this page.
- **Description and Rating**
- JETEC DATA JOINT ELECTRON TUBE ENGINEERING COUNCIL COMMITTEE ON RECEIVING TUBES (filed under 6J5GT)