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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 |
|---|---|---|---|---|---|---|---|---|
| 262A | 2 | 6 | 10 | 15 | 25 | A | AMPL | |
| 262B | 2 | 6 | 10 | 15 | 25 | A | AMPL | |
| 26C6 | 3 | 8 | 25 | 0 | 0 | K | DIODE | Diode No. 2 |
| 26C6 | 7 | 10 | 25 | 0 | 0 | K | DIODE | Diode No. 1 |
| 26C6 | 11 | 2 | 25 | 57 | 9 | K | AMPL | Mut.Cond.1700. Triode Section |
| 26D6 | 7 | 9 | 25 | 52 | 9 | K | AMPL | Mut.Cond.1425. Osc. Section |
| 26D6 | 8 | 5 | 25 | 55 | 15 | K | AMPL | Mut.Cond.1600. Ampl. Section. |
| 26E6 | 8 | 0 | 25 | 74 | 36 | E | AMPL | Mut.Cond.6000. Read in good scale. |
| 26E6W | 8 | 5 | 25 | 60 | 42 | E | AMPL | Allow tube 60 seconds to warm-up. Set MICROMHOS switch at 6000. |
| 27 | 1 | 6 | 2.5 | 40 | 34 | B | AMPL | Mut.Cond.1000. |
| 27 Special | 1 | 6 | 2.5 | 40 | 34 | B | AMPL | Mut.Cond.1000. |
| 271A | 1 | 6 | 5 | 60 | 30 | A | AMPL | Minimum Value of 1580. |
| 272A | 1 | 6 | 10 | 46 | 26 | B | AMPL | |
| 274A | 2 | 7 | 5 | 35 | 0 | A | RECT. STD. | See note D. |
| 274A | 3 | 7 | 5 | 35 | 0 | A | RECT. STD. | See note D. |
| 274B | 4 | 11 | 5 | 35 | 0 | E | RECT. STD. | See note D. |
| 274B | 5 | 11 | 5 | 35 | 0 | E | RECT. STD. | See note D. |
| 275A | 2 | 10 | 5 | 54 | 70 | A | AMPL | |
| 27HM | 1 | 6 | 2.5 | 53 | 29 | B | AMPL | Mut.Cond.1450. |
| 283A | 7 | 6 | 2 | 49 | 10 | B | AMPL | |
| 285A | 7 | 6 | 2 | 60 | 30 | B | AMPL | Minimum Value of 660. |
| 28D7 | 3 | 6 | 25 | 60 | 12 | F | AMPL | Mut.Cond.2000. Plate #2. |
| 28D7 | 8 | 1 | 25 | 60 | 12 | F | AMPL | Mut.Cond.2000. Plate #1. |
| 29 | 8 | 6 | 2.5 | 0 | 19 | C | AMPL | Mut. Cont.500. No. 2. Grid. |
| 29 | 8 | 8 | 2.5 | 0 | 19 | C | AMPL | Mut.Cond.500. No. 1. Grid. |
| 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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