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I-177 Tube Tester
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Select or type a tube name to get specific settings for the I-177 Tube Tester.
Sort columns values by clicking their titles - A → Z or Z → A
| Tube | A | B | Filament | L | R | Socket | Press | Notes |
|---|---|---|---|---|---|---|---|---|
| 7A4 | 6 | 2 | 6.3 | 66 | 14 | F | AMPL | Mut.Cond.2600. |
| 7A5 | 6 | 2 | 6.3 | 71 | 23 | F | AMPL | Mut.Cond.6000. |
| 7A6 | 11 | 5 | 6.3 | 40 | 0 | F | DIODE | |
| 7A6 | 8 | 5 | 6.3 | 40 | 0 | F | DIODE | Shorts on 1, 4, and 5. |
| 7A7 | 6 | 2 | 6.3 | 58 | 22 | F | AMPL | Mut.Cond.1750. |
| 7A8 | 8 | 10 | 6.3 | 0 | 21 | F | AMPL | Mut.Cond.500. See note D. |
| 7A8 | 5 | 3 | 6.3 | 41 | 20 | F | AMPL | Mut.Cond.1000. See note D. |
| 7AB7 | 3 | 9 | 6.3 | 58 | 0 | N | AMPL | Shorts on 4 and 5. |
| 7AD7 | 5 | 4 | 6.3 | 74 | 8 | F | AMPL | Mut.Cond.6200. |
| 7AF7 | 2 | 9 | 6.3 | 64 | 0 | F | AMPL | Mut.Cond.2600. Shorts on 1, 4, and 5. |
| 7AF7 | 12 | 5 | 6.3 | 64 | 0 | F | AMPL | Mut.Cond.2600. |
| 7AG7 | 6 | 2 | 6.3 | 67 | 0 | F | AMPL | Mut.Cond.3000. |
| 7AH7 | 5 | 4 | 6.3 | 68 | 0 | F | AMPL | Mut.Cond.3300. |
| 7AJ7 | 5 | 4 | 6.3 | 62 | 7 | F | AMPL | Mut.Cond.2275. |
| 7AK7 | 5 | 4 | 6.3 | 77 | 0 | F | AMPL | Mut.Cond.3200. |
| 7B4 | 6 | 2 | 6.3 | 43 | 10 | F | AMPL | Mut.Cond.1000. |
| 7B5 | 6 | 2 | 6.3 | 56 | 28 | F | AMPL | Mut.Cond.1600. |
| 7B6 | 6 | 10 | 6.3 | 0 | 0 | F | DIODE | Shorts on 1, 4, and 5. |
| 7B6 | 8 | 3 | 6.3 | 0 | 0 | F | DIODE | Shorts on 1, 4, and 5. |
| 7B6 | 2 | 3 | 6.3 | 28 | 9 | F | AMPL | Mut.Cond.750. Shorts on 1, 4, and 5. |
| 7B7 | 5 | 4 | 6.3 | 57 | 22 | F | AMPL | Mut.Cond.1700. |
| 7B8 | 8 | 10 | 6.3 | 0 | 15 | F | AMPL | Mut.Cond.500. |
| 7B8 | 5 | 3 | 6.3 | 40 | 22 | F | AMPL | Mut.Cond.1000. |
| 7C4 | 9 | 5 | 6.3 | 25 | 0 | F | DIODE | |
| 7C4 | 9 | 5 | 6.3 | 25 | 0 | F | DIODE | |
| Important | ||||||||
|---|---|---|---|---|---|---|---|---|
| This I-177 data-base was created using data from I-177 beta 1.08 worksheet, from July 5, 2002. A great compilation by Nolam E. Lee. | ||||||||
| Note A: The plate cap of the tube under test should be connected to the upper left contact of the 6-pin (C) socket. A 12-inch lead with clip and bananna plug is provided for this purpose. | ||||||||
| Note B: Connect the plate cap (nearest the operator) to the upper left contact of the 6-pin (C) socket; use the lead provided. Connect the grid lead to the remaining cap on the tube. | ||||||||
| Note C: Set the MICROMHOS switch at 6000 when testing this section if the tube tester bears either Order No. 27613-Phila-44-52 or 52346-Phila-45-10 on the nomenclature plate. | ||||||||
| Note D: This test is only a partial indication of a good tube. A complete test is only possible when using equipment. | ||||||||
| Note E: Do not tap on this tube when testing for short because damage to the tube may result. | ||||||||
| Note F: The Mutual Conductance values listed are averages for new tubes and only for a guide. |
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Last modified: Jun 5, 2026 20:40
Cape Old Radio - Since Nov, 1996
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