6K8
6K8 has no equivalent designation confirmed by the archive. Completed sales put the typical price at $15.29 per tube.
What 6K8 Sells For
| Measure | Per tube |
|---|---|
| Median | $15.29 |
| Typical range (25th–75th) | $10.99 – $16.91 |
| Most sales (10th–90th) | $9.00 – $25.17 |
| Extremes incl. outliers | $6.29 – $56.90 |
| Completed sales | 21 |
By Brand
| Brand | Median | Range | Sales |
|---|---|---|---|
| RCA | $14.40 | $10.99 – $30.45 | 8 |
| GE | $9.50 | $9.00 – $15.94 | 3 |
By Condition
| Condition | Median | Sales |
|---|---|---|
| NOS | $13.00 | 9 |
| used | $15.94 | 9 |
Per-tube prices from completed sales, 2026-02-26 to 2026-09-23. Matched pairs and quads are divided out. See the price index for how these move over time.
Datasheets
Original manufacturer datasheets for 6K8, hosted by Frank Philipse's Electron Tube Data sheets.
| Manufacturer | Designation | Datasheet |
|---|---|---|
| RCA (HB3) | 6K8 | PDF (122 KB) |
| RCA | 6K8 | PDF (115 KB) |
| Sylvania | 6K8 | PDF (95 KB) |
| Tung-Sol | 6K8 | PDF (91 KB) |
| Mazda | 6K8 | PDF (54 KB) |
In the Archive
Documents held here and used to write this page.
- 6K8
3 further designations appear alongside 6K8 in the literature but below the evidence threshold used here, so they are not listed as equivalent.