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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 |
|---|---|---|---|---|---|---|---|---|
| 25CU6 | 8 | 5 | 25 | 71 | 41 | E | AMPL | Mut.Cond.4500. Connect cap to upper right contact of 4-pin socket. |
| 25D8 | 5 | 1 | 25 | 0 | 0 | E | DIODE | |
| 25D8 | 11 | 5 | 25 | 45 | 0 | E | AMPL | Mut.Cond.1100. |
| 25D8 | 8 | 5 | 25 | 59 | 15 | E | AMPL | Mut.Cond.1900. |
| 25L6 | 8 | 5 | 25 | 75 | 15 | E | AMPL | Mut.Cond.8000. |
| 25N6 | 8 | 5 | 25 | 64 | 0 | E | AMPL | Mut.Cond.2500. |
| 25S | 12 | 3 | 2 | 0 | 0 | C | DIODE | |
| 25S | 10 | 8 | 2 | 0 | 0 | C | DIODE | |
| 25S | 7 | 8 | 2 | 60 | 23 | C | AMPL | OK over 380 |
| 25T | 2 | 10 | 6.3 | 41 | 0 | A | AMPL | Mut.Cond.1000. Connect cap to plate contact of 5-pin socket. |
| 25W4 | 12 | 4 | 25 | 40 | 0 | G | RECT. STD. | |
| 25W6 | 8 | 5 | 25 | 67 | 46 | E | AMPL | Mut. Cond.3000. |
| 25X6 | 7 | 5 | 25 | 40 | 0 | E | RECT. STD. | See note D. |
| 25X6 | 7 | 2 | 25 | 40 | 0 | E | RECT. STD. | See note D. |
| 25Y5 | 12 | 8 | 25 | 40 | 0 | C | RECT. STD. | See note D. |
| 25Y5 | 7 | 8 | 25 | 40 | 0 | C | RECT. STD. | See note D. |
| 25Z3 | 1 | 5 | 25 | 40 | 0 | A | RECT. STD. | See note D. |
| 25Z4 | 7 | 2 | 25 | 35 | 0 | E | RECT. STD. | See note D. |
| 25Z5 | 12 | 8 | 25 | 40 | 0 | C | RECT. STD. | See note D. |
| 25Z5 | 7 | 8 | 25 | 40 | 0 | C | RECT. STD. | See note D. |
| 25Z5M | 7 | 5 | 25 | 40 | 0 | E | RECT. STD. | See note D. |
| 25Z5M | 7 | 2 | 25 | 40 | 0 | E | RECT. STD. | See note D. |
| 25Z6 | 7 | 5 | 25 | 40 | 0 | E | RECT. STD. | See note D. |
| 25Z6 | 7 | 2 | 25 | 40 | 0 | E | RECT. STD. | See note D. |
| 26 | 2 | 10 | 1.5 | 46 | 35 | A | AMPL | Mut.Cond.1150. |
| 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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