6N5
6N5 is also designated 6AB5. Completed sales put the typical price at $18.25 per tube.
Description
The 6N5 is a tuning indicator triode, as described in the Sylvania datasheet. It features a fluorescent screen whose shadow angle varies from 90° to 0° with grid bias.
Construction
The 6N5 has a small 6-pin base (6-R) and an ST-12 bulb. It can be mounted in any position. The tube is similar to the 6AB5 except for the bulb and plate current cutoff.
Ratings
The 6N5 heater requires 6.3 volts at 0.150 ampere (150 milliamperes). According to the Tung-Sol datasheet for the 6AB5/6N5, the maximum plate supply voltage is 180 volts, the maximum target voltage is 180 volts, and the minimum target voltage is 100 volts.
Applications
The Tung-Sol datasheet recommends the 6AB5/6N5 for applications requiring a heater of low current drain.
| Designation | Evidence | Confidence |
|---|---|---|
| 6AB5 | 82 independent documents | strong |
Equivalence is asserted only where the archive's own literature states it directly, in at least 40 separate documents. Tubes that merely substitute in some circuits are not listed here.
| Measure | Per tube |
|---|---|
| Median | $18.25 |
| Typical range (25th–75th) | $11.25 – $28.60 |
| Most sales (10th–90th) | $10.65 – $32.60 |
| Extremes incl. outliers | $3.31 – $86.08 |
| Completed sales | 11 |
| Condition | Median | Sales |
|---|---|---|
| NOS | $22.30 | 8 |
Per-tube prices from completed sales, 2026-03-27 to 2026-09-24. Matched pairs and quads are divided out. See the price index for how these move over time.
Original manufacturer datasheets for 6N5, hosted by Frank Philipse's Electron Tube Data sheets.
| Manufacturer | Designation | Datasheet |
|---|---|---|
| Sylvania | 6N5 | PDF (54 KB) |
| NU | 6N5 | PDF (20 KB) |
| RCA (HB3) | 6AB5 | PDF (84 KB) |
| Tung-Sol | 6AB5 | PDF (79 KB) |
| Sylvania | 6AB5 | PDF (47 KB) |
| Raytheon | 6AB5 | PDF (40 KB) |
Documents held here and used to write this page.
- VISUEL D'ACCORD
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