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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 |
|---|---|---|---|---|---|---|---|---|
| 12C8 | 7 | 5 | 12.6 | 45 | 20 | E | AMPL | Mut.Cond.1150. Pentode Section. |
| 12CR6 | 5 | 1 | 12.6 | 0 | 18 | K | DIODE | Diode Section |
| 12CR6 | 7 | 7 | 12.6 | 60 | 18 | K | AMPL | Mut.Cond.1950. |
| 12CS6 | 4 | 9 | 12.6 | 30 | 33 | K | AMPL | Mut.Cond. 800. |
| 12CU6 | 8 | 5 | 12.6 | 71 | 41 | E | AMPL | Mut.Cond.4500. Connect cap to upper right contact of 4-pin socket |
| 12F5 | 10 | 5 | 12.6 | 41 | 10 | E | AMPL | Mut.Cond.1000. |
| 12G4 | 8 | 9 | 12.6 | 60 | 23 | L | AMPL | Mut.Cond.2000. |
| 12H6 | 7 | 5 | 12.6 | 50 | 0 | E | DIODE | |
| 12H6 | 7 | 2 | 12.6 | 50 | 0 | E | DIODE | |
| 12J5 | 7 | 5 | 12.6 | 60 | 24 | E | AMPL | Mut.Cond.2000. |
| 12J7 | 1 | 9 | 12.6 | 48 | 18 | E | AMPL | Mut.Cond.1225. |
| 12K7 | 8 | 5 | 12.6 | 54 | 20 | E | AMPL | Mut.Cond.1450. |
| 12K8 | 11 | 5 | 12.6 | 63 | 9 | E | AMPL | Mut.Cond.2400. Triode Section. See note D. |
| 12K8 | 8 | 5 | 12.6 | 41 | 9 | E | AMPL | Mut.Cond.1000. Hexode Section. See note D. |
| 12L6 | 8 | 5 | 12.6 | 74 | 25 | E | AMPL | Mut.Cond.7500. |
| 12L8 | 8 | 8 | 12.6 | 58 | 15 | E | AMPL | Use adapter #1. |
| 12L8 | 11 | 6 | 12.6 | 58 | 15 | E | AMPL | Use adapter #1. |
| 12Q7 | 10 | 2 | 12.6 | 0 | 0 | E | DIODE | |
| 12Q7 | 10 | 5 | 12.6 | 0 | 0 | E | DIODE | |
| 12Q7 | 7 | 5 | 12.6 | 33 | 14 | E | AMPL | Mut.Cond.800. |
| 12SA7 | 7 | 7 | 12.6 | 28 | 17 | E | AMPL | Mut.Cond.750. See note D. |
| 12SA7 | 1 | 7 | 12.6 | 28 | 17 | E | AMPL | Mut.Cond.750. See note D. |
| 12SC7 | 1 | 3 | 12.6 | 42 | 0 | G | AMPL | Mut.Cond.1000. |
| 12SC7 | 10 | 3 | 12.6 | 42 | 0 | G | AMPL | Mut.Cond.1000. |
| 12SF5 | 7 | 2 | 12.6 | 40 | 13 | G | AMPL | Mut.Cond.1000. |
| 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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