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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 |
|---|---|---|---|---|---|---|---|---|
| ZA2 | 6 | 7 | 6.3 | 44 | 17 | M | AMPL | Mut.Cond.1100. |
| XXL | 6 | 2 | 6.3 | 67 | 0 | F | AMPL | Mut.Cond.3000. |
| XXFM | 7 | 3 | 6.3 | 0 | 0 | F | DIODE | |
| XXFM | 12 | 8 | 6.3 | 0 | 0 | F | DIODE | |
| XXFM | 1 | 2 | 6.3 | 30 | 0 | F | AMPL | Shorts on 1, 4, and 5. |
| XXD | 2 | 9 | 12.6 | 64 | 0 | F | AMPL | Mut.Cond.2500. |
| XXD | 12 | 5 | 12.6 | 64 | 0 | F | AMPL | Mut.Cond.2500.Shorts on 1, 4, and 5. |
| XXB | 12 | 6 | 2.5 | 31 | 60 | F | AMPL | OK over 320. |
| XXB | 2 | 10 | 2.5 | 30 | 30 | F | AMPL | |
| WX12 | 2 | 10 | 1.5 | 60 | 36 | A | AMPL | Mut.Cond.425. MICROMHOS only. OK over 340 on 3000 Scale |
| WUN-A | 8 | 6 | 2.5 | 11 | 37 | ? | AMPL | Mut.Cond.600. Grid #2. |
| WUN-A | 8 | 8 | 2.5 | 11 | 37 | ? | AMPL | Mut.Cond.600. Grid #1. |
| WE731A | 1 | 9 | 6.3 | 55 | 20 | K | AMPL | Mut.Cond.1500.Shorts on 4 and 5. |
| WD11 | 2 | 10 | 1.5 | 60 | 35 | A | AMPL | Mut.Cond.425. MICROMHOS only. OK over 340 on 3000 Scale |
| VTR150-30 | 7 | 1 | 0 | 30 | 0 | G | GAS No. 1 | Shorts on 4 and 5. See note D. |
| VT67 | 2 | 10 | 2 | 43 | 30 | A | AMPL | Mut.Cond.1025. |
| VT25A | 2 | 10 | 6.3 | 60 | 25 | A | AMPL | Mut.Cond.2000. |
| VT153 | 7 | 5 | 12.6 | 45 | 20 | E | AMPL | |
| VT153 | 10 | 2 | 12.6 | 0 | 0 | E | DIODE | |
| VT153 | 10 | 5 | 12.6 | 0 | 0 | E | DIODE | |
| VR90-30 | 7 | 1 | 0 | 30 | 0 | G | GAS No. 1 | Shorts on 4 and 5. See note D. |
| VR75-30 | 7 | 1 | 0 | 50 | 0 | G | GAS No. 1 | Shorts on 4 and 5. See note D. |
| VR57 (Brit.) | 12 | 7 | 6.3 | 60 | 20 | E | AMPL | Mut.Cond.300. OK over 240. See note D. |
| VR57 (Brit.) | 7 | 7 | 6.3 | 41 | 22 | E | AMPL | Mut.Cond.1000. See note D. |
| VR57 (Brit.) | 1 | 9 | 6.3 | 48 | 18 | E | AMPL | Mut.Cond.1225. |
| 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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