6BK4
6BK4 has no equivalent designation confirmed by the archive. Completed sales put the typical price at $17.20 per tube.
What 6BK4 Sells For
| Measure | Per tube |
|---|---|
| Median | $17.20 |
| Typical range (25th–75th) | $10.16 – $22.09 |
| Most sales (10th–90th) | $5.91 – $29.23 |
| Extremes incl. outliers | $3.95 – $42.94 |
| Completed sales | 36 |
By Brand
| Brand | Median | Range | Sales |
|---|---|---|---|
| RCA | $15.95 | $9.95 – $20.50 | 11 |
| GE | $9.88 | $4.95 – $12.54 | 6 |
| Sylvania | $19.54 | $14.00 – $22.44 | 5 |
| Amperex | $19.16 | $5.91 – $29.23 | 3 |
| Svetlana | $34.97 | $29.98 – $42.94 | 3 |
By Condition
| Condition | Median | Sales |
|---|---|---|
| NOS | $14.42 | 16 |
| used | $15.47 | 11 |
Per-tube prices from completed sales, 2026-07-31 to 2026-09-15. Matched pairs and quads are divided out. See the price index for how these move over time.
Datasheets
Original manufacturer datasheets for 6BK4, hosted by Frank Philipse's Electron Tube Data sheets.
| Manufacturer | Designation | Datasheet |
|---|---|---|
| Sylvania | 6BK4 | PDF (198 KB) |
| Tung-Sol | 6BK4 | PDF (109 KB) |
In the Archive
Documents held here and used to write this page.
- engineering data service