1S4
1S4 has no equivalent designation confirmed by the archive. Completed sales put the typical price at $9.73 per tube.
What 1S4 Sells For
| Measure | Per tube |
|---|---|
| Median | $9.73 |
| Typical range (25th–75th) | $8.95 – $11.55 |
| Most sales (10th–90th) | $7.50 – $19.65 |
| Extremes incl. outliers | $2.65 – $19.65 |
| Completed sales | 10 |
By Condition
| Condition | Median | Sales |
|---|---|---|
| NOS | $9.19 | 9 |
Per-tube prices from completed sales, 2026-06-17 to 2026-08-27. Matched pairs and quads are divided out. See the price index for how these move over time.
Datasheets
Original manufacturer datasheets for 1S4, hosted by Frank Philipse's Electron Tube Data sheets.
| Manufacturer | Designation | Datasheet |
|---|---|---|
| RCA (HB3) | 1S4 | PDF (243 KB) |
| Tung-Sol | 1S4 | PDF (164 KB) |
In the Archive
Documents held here and used to write this page.
- 1S4
1 further designation appears alongside 1S4 in the literature but below the evidence threshold used here, so it is not listed as equivalent.