6SJ7
6SJ7 has no equivalent designation confirmed by the archive. Completed sales put the typical price at $12.75 per tube.
Description
The 6SJ7 and 6SJ7-GT are sharp-cutoff pentodes.
Ratings
The maximum plate voltage is 250 volts. The maximum plate dissipation is 2.5 watts. The maximum grid No. 2 dissipation is 0.7 watt. The maximum grid No. 1 voltage is 0 volts (positive bias value). The peak heater-cathode voltage is 90 volts maximum, with heater negative or positive with respect to cathode.
Characteristics
In pentode connection, the grid No. 1 to plate capacitance is 0.005 micro-microfarads maximum. In triode connection, grids No. 2 and No. 3 are connected to the plate. At a plate voltage of 250 volts, the amplification factor is 19, the plate resistance is approximately 7600 ohms, the transconductance is 2500 micromhos, and the plate current is 9.2 milliamperes.
Mechanical
The tube can be mounted in any position. The maximum overall length is 2-5/8 inches, the maximum seated length is 2-1/16 inches, and the maximum diameter is 1-5/16 inches.
| Measure | Per tube |
|---|---|
| Median | $12.75 |
| Typical range (25th–75th) | $8.80 – $20.02 |
| Most sales (10th–90th) | $4.32 – $42.15 |
| Extremes incl. outliers | $1.06 – $76.45 |
| Completed sales | 109 |
| Brand | Median | Range | Sales |
|---|---|---|---|
| RCA | $12.54 | $8.12 – $20.02 | 29 |
| Sylvania | $14.95 | $12.75 – $20.25 | 25 |
| GE | $9.50 | $9.27 – $15.35 | 7 |
| Raytheon | $13.87 | $12.75 – $21.98 | 6 |
| Tung-Sol | $61.48 | $61.48 – $61.48 | 6 |
| Ken-Rad | $4.24 | $3.00 – $14.95 | 3 |
| Westinghouse | $14.14 | $12.06 – $21.00 | 3 |
| Condition | Median | Sales |
|---|---|---|
| NOS | $15.99 | 51 |
| used | $12.75 | 41 |
Per-tube prices from completed sales, 2026-06-30 to 2026-09-26. Matched pairs and quads are divided out. See the price index for how these move over time.
Original manufacturer datasheets for 6SJ7, hosted by Frank Philipse's Electron Tube Data sheets.
| Manufacturer | Designation | Datasheet |
|---|---|---|
| General Electric | 6SJ7 | PDF (434 KB) |
| RCA (HB3) | 6SJ7 | PDF (408 KB) |
| Tung-Sol | 6SJ7 | PDF (125 KB) |
| RFT | 6SJ7 | PDF (84 KB) |
Documents held here and used to write this page.
- 6SJ7,6SJ7-GT SHARP-CUTOFF PENTODE
2 further designations appear alongside 6SJ7 in the literature but below the evidence threshold used here, so they are not listed as equivalent.