7581
7581 has no equivalent designation confirmed by the archive. Completed sales put the typical price at $64.77 per tube.
What 7581 Sells For
| Measure | Per tube |
|---|---|
| Median | $64.77 |
| Typical range (25th–75th) | $50.00 – $150.00 |
| Most sales (10th–90th) | $37.50 – $163.91 |
| Extremes incl. outliers | $37.49 – $169.00 |
| Completed sales | 12 |
By Brand
| Brand | Median | Range | Sales |
|---|---|---|---|
| Tung-Sol | $41.72 | $37.50 – $50.00 | 4 |
| RCA | $74.00 | $70.00 – $150.00 | 4 |
By Condition
| Condition | Median | Sales |
|---|---|---|
| NOS | $110.00 | 4 |
| used | $78.00 | 3 |
| current | $37.50 | 3 |
Per-tube prices from completed sales, 2026-07-07 to 2026-09-24. Matched pairs and quads are divided out. See the price index for how these move over time.
Datasheets
Original manufacturer datasheets for 7581, hosted by Frank Philipse's Electron Tube Data sheets.
| Manufacturer | Designation | Datasheet |
|---|---|---|
| Tung-Sol | 7581 | PDF (656 KB) |
In the Archive
Documents held here and used to write this page.
- DIRECT INTERELECTRODE CAPACITANCES - APPROX.