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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 |
|---|---|---|---|---|---|---|---|---|
| 50C6 | 8 | 5 | 50 | 74 | 36 | E | AMPL | Mut.Cond.7000. |
| 50L6 | 8 | 5 | 50 | 74 | 25 | E | AMPL | Mut.Cond.7500. |
| 50X6 | 6 | 9 | 50 | 40 | 0 | F | RECT. STD. | |
| 50X6 | 1 | 9 | 50 | 40 | 0 | F | RECT. STD. | |
| 50Y6 | 7 | 2 | 50 | 40 | 0 | E | RECT. STD. | See note D. |
| 50Y6 | 7 | 5 | 50 | 40 | 0 | E | RECT. STD. | See note D. |
| 50Y7 | 7 | 5 | 50 | 45 | 0 | E | RECT. STD. | Shorts on 2, 3, 4, and 5. Plate No.2. |
| 50Y7 | 7 | 2 | 50 | 45 | 0 | E | RECT. STD. | Shorts on 2, 3, 4, and 5. Plate No.1. |
| 50Z7 | 10 | 2 | 50 | 40 | 0 | E | RECT. STD. | See note D. |
| 50Z7 | 7 | 6 | 50 | 40 | 0 | E | RECT. STD. | Shorts on 4 and 5. See note D. |
| 51 | 7 | 6 | 2.5 | 42 | 20 | B | AMPL | Mut.Cond.1020. |
| 51S | 7 | 6 | 2.5 | 42 | 20 | B | AMPL | Mut.Cond.1020. |
| 52 | 1 | 5 | 6.3 | 63 | 27 | B | AMPL | Mut.Cond.2400. |
| 53 | 12 | 5 | 2.5 | 53 | 10 | D | AMPL | Mut.Cond.1500. |
| 53 | 1 | 5 | 2.5 | 53 | 10 | D | AMPL | Mut.Cond.1500. |
| 535-B Boonton | 10 | 3 | 2.5 | 0 | 0 | C | DIODE | Diode No. 2 |
| 535-B Boonton | 10 | 6 | 2.5 | 0 | 0 | C | DIODE | Diode No. 1 |
| 535-B Boonton | 7 | 6 | 2.5 | 28 | 9 | C | AMPL | Mut.Cond.750. Triode Sect. |
| 536-B Boonton | 2 | 10 | 2.5 | 59 | 50 | A | AMPL | Mut.Cond.1850. |
| 55 | 10 | 3 | 2.5 | 0 | 0 | C | DIODE | OK over 500. |
| 55 | 10 | 6 | 2.5 | 0 | 0 | C | DIODE | OK over 500. |
| 55 | 7 | 6 | 2.5 | 40 | 32 | C | AMPL | Mut.Cond.975. |
| 551 | 7 | 6 | 2.5 | 42 | 20 | ? | AMPL | Mut.Cond.1020. |
| 5517 | 10 | 2 | 0 | 64 | 0 | H | 0Z4 | Connect plate cap of tube to upper left contact of 6-pin (C) siocket. Use special lead provided. Shorts on 4 and 5. See |
| 5556 | 2 | 10 | 5 | 49 | 21 | A | AMPL | Mut.Cond.1300. |
| 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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