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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 |
|---|---|---|---|---|---|---|---|---|
| 231D | 2 | 10 | 3 | 19 | 15 | A | AMPL | |
| 239A | 2 | 10 | 1.1 | 60 | 40 | A | AMPL | Minimum value of 320. |
| 24 | 7 | 6 | 2.5 | 42 | 10 | B | AMPL | Mut.Cond.1000. |
| 244A | 1 | 6 | 2 | 43 | 10 | B | AMPL | |
| 245A | 7 | 6 | 2 | 60 | 35 | B | AMPL | Minimum Value of 525. |
| 247A | 1 | 6 | 2 | 60 | 28 | B | AMPL | Minimum Value of 400. |
| 24A | 7 | 6 | 2.5 | 42 | 10 | B | AMPL | Mut.Cond.1000. |
| 24G | 7 | 6 | 2.5 | 42 | 10 | B | AMPL | |
| 257 | 1 | 5 | 5 | 49 | 41 | A | AMPL | Mut.Cond.1250. |
| 257A | 2 | 5 | 3 | 0 | 40 | A | AMPL | Attach clip of cap lead to the top cap of the tube under test. OK over 200. |
| 259A | 7 | 6 | 2 | 28 | 26 | B | AMPL | |
| 259B | 7 | 6 | 2 | 28 | 26 | B | AMPL | |
| 25A6 | 8 | 5 | 25 | 62 | 35 | E | AMPL | Mut.Cond.2300. |
| 25A7 | 8 | 5 | 25 | 58 | 35 | E | AMPL | Mut.Cond.1800. Shorts on 1, 4, and 5. |
| 25A7 | 11 | 5 | 25 | 40 | 0 | E | RECT. STD. | See note D. |
| 25A7 | 11 | 5 | 25 | 40 | 0 | E | NOTHING | Check for shorts |
| 25AC5 | 7 | 5 | 25 | 52 | 0 | E | AMPL | Mut.Cond.1500. |
| 25AX4 | 7 | 1 | 25 | 40 | 0 | G | RECT. STD. | |
| 25B5 | 8 | 5 | 25 | 64 | 0 | C | AMPL | Mut.Cond.2500. |
| 25B6 | 8 | 5 | 25 | 71 | 43 | E | AMPL | Mut.Cond.4000. |
| 25B8 | 11 | 1 | 25 | 54 | 8 | E | AMPL | Triode Section. Mut.Cond.1500. |
| 25B8 | 1 | 7 | 25 | 60 | 18 | E | AMPL | Pentode Section. Mut.Cond.2000. |
| 25BQ6 | 8 | 5 | 25 | 71 | 41 | E | AMPL | Mut.Cond.4500. Connect plate cap to upper right contact of 4-pin socket. |
| 25C6 | 8 | 5 | 25 | 74 | 36 | E | AMPL | Mut.Cond.7000. |
| 25CD6 | 9 | 6 | 25 | 74 | 34 | E | AMPL | Mut.Cond.6500. Connect cap to upper right contact of 6-pin socket. |
| 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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