6SL7
6SL7 has no equivalent designation confirmed by the archive. Completed sales put the typical price at $28.98 per tube.
Construction
The 6SL7 is a dual triode in an octal base (Oktalsockel). It weighs approximately 34 g.
Ratings
The heater requires 6.3 V at 300 mA. Per system, at an anode voltage of 250 V and a grid bias of −2 V, the anode current is 2.3 mA, with a transconductance of 1.6 mA/V, an amplification factor of 70, and an anode impedance of 44 kΩ.
Maximum ratings per system include an anode cold voltage of 550 V, an anode voltage of 275 V, and an anode dissipation of 1.1 W. The minimum grid voltage is 0 V, and grid current onset occurs at −1.3 V. The maximum voltage between heater and cathode is 100 V, with a maximum external resistance between them of 20 kΩ.
Capacitances
Per system, the grid-to-anode capacitance is 1.5 pF, the grid-to-cathode capacitance is 1.5 pF, and the anode-to-cathode capacitance is 2.0 pF. Inter-system capacitances are rated as follows: anode I to anode II ≤ 0.4 pF, grid I to grid II ≤ 0.03 pF, and grid II to anode I ≤ 0.01 pF.
Documentation
The datasheet is dated June 1953 and was approved under TRPT number 7396/52 by the East German Ministry for Foreign Trade and Inner-German Trade.
| Measure | Per tube |
|---|---|
| Median | $28.98 |
| Typical range (25th–75th) | $16.67 – $53.49 |
| Most sales (10th–90th) | $9.99 – $89.70 |
| Extremes incl. outliers | $1.82 – $544.50 |
| Completed sales | 385 |
| Brand | Median | Range | Sales |
|---|---|---|---|
| RCA | $28.18 | $16.00 – $61.50 | 102 |
| Sylvania | $30.05 | $21.95 – $44.50 | 84 |
| Tung-Sol | $67.95 | $26.74 – $93.49 | 35 |
| GE | $20.63 | $17.00 – $31.50 | 28 |
| Ken-Rad | $39.99 | $33.98 – $69.95 | 11 |
| Raytheon | $29.12 | $17.80 – $62.00 | 8 |
| National Union | $41.40 | $25.50 – $55.99 | 7 |
| Shuguang | $82.95 | $74.95 – $103.49 | 5 |
| Mullard | $347.74 | $311.56 – $420.75 | 4 |
| Philips | $39.20 | $37.50 – $40.89 | 4 |
| Condition | Median | Sales |
|---|---|---|
| NOS | $33.50 | 165 |
| used | $24.95 | 159 |
| current | $74.95 | 17 |
Per-tube prices from completed sales, 2024-12-04 to 2026-10-18. Matched pairs and quads are divided out. See the price index for how these move over time.
Original manufacturer datasheets for 6SL7, hosted by Frank Philipse's Electron Tube Data sheets.
| Manufacturer | Designation | Datasheet |
|---|---|---|
| RFT | 6SL7 | PDF (70 KB) |
Documents held here and used to write this page.
- 6 SL 7