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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 |
|---|---|---|---|---|---|---|---|---|
| 6Z7 | 12 | 5 | 6.3 | 45 | 9 | E | AMPL | Mut.Cond.1200. |
| 6Z7 | 2 | 9 | 6.3 | 45 | 9 | E | AMPL | Mut.Cond.1200. |
| 6ZY5 | 7 | 5 | 6.3 | 40 | 0 | E | RECT. STD. | See note D. |
| 6ZY5 | 7 | 2 | 6.3 | 40 | 0 | E | RECT. STD. | See note D. |
| 70 | 8 | 6 | 6.3 | 60 | 25 | C | AMPL | Mut.Cond.300. MICROMHOS only. OK over 240 on 3000 scale. |
| 70 | 8 | 8 | 6.3 | 60 | 25 | C | AMPL | Mut.Cond.300. MICROMHOS only. OK over 240 on 3000 scale. |
| 7000 | 1 | 9 | 6.3 | 48 | 18 | E | AMPL | Mut.Cond.1225. |
| 7055 | 4 | 2 | 12.6 | 60 | 0 | K | DIODE | |
| 7055 | 9 | 2 | 12.6 | 60 | 0 | K | DIODE | |
| 7056 | 1 | 9 | 12.6 | 62 | 18 | K | AMPL | Mut.Cond.2200. |
| 70A7 | 8 | 5 | 75 | 71 | 17 | E | AMPL | Mut.Cond.5800. Shorts on 1, 4, and 5. |
| 70A7 | 11 | 5 | 75 | 0 | 0 | E | DIODE | OK over 300. |
| 70L7 | 5 | 1 | 75 | 40 | 0 | E | RECT. STD. | See note D. |
| 70L7 | 7 | 7 | 75 | 71 | 34 | E | AMPL | Mut.Cond.5000. |
| 70L7 | 6 | 12 | 75 | 71 | 34 | E | NOTHING | Check for shorts |
| 713A | 4 | 2 | 6.3 | 42 | 24 | E | AMPL | See note A. |
| 717A | 4 | 2 | 6.3 | 44 | 23 | E | AMPL | Mut.Cond.3500. |
| 7193 | 7 | 2 | 12.6 | 57 | 25 | E | AMPL | Mut.Cond.3000. |
| 71A | 2 | 10 | 5 | 56 | 60 | A | AMPL | Mut.Cond.1650. |
| 72 | 7 | 1 | 2.5 | 10 | 0 | A | RECT. STD. | See notes A and D. |
| 7316 | 4 | 2 | 12.6 | 60 | 25 | E | AMPL | Use adapter #6 for triode #2. |
| 7316 | 4 | 2 | 12.6 | 60 | 25 | E | AMPL | Use adapter #5 for triode #1. |
| 7489 | 4 | 2 | 12.6 | 60 | 25 | E | AMPL | Use adapter #5 for triode #1. |
| 7489 | 4 | 2 | 12.6 | 60 | 25 | E | AMPL | Use adapter #6 for triode #2. |
| 75 | 10 | 3 | 6.3 | 0 | 0 | C | 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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