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I-177 Tube Tester




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
12SF78 112.60 0GDIODE
12SF76 712.660 0GAMPL Mut.Cond.2000.
12SG74 212.668 10EAMPL Mut.Cond.3300.
12SH74 212.669 0EAMPL Mut.Cond.3400.
12SJ74 212.656 18EAMPL Mut.Cond.1575.
12SK74 212.659 18EAMPL Mut.Cond.1900.
12SL710 412.653 0GAMPL Mut.Cond.1400. Shorts on 2 and 3.
12SL74 112.653 0GAMPL Mut.Cond.1400. Shorts on 2 and 3.
12SN710 412.667 0GAMPL Mut.Cond.3000. Shorts on 2 and 3.
12SN74 112.667 0GAMPL Mut.Cond.3000. Shorts on 2 and 3.
12SQ77 112.60 0GDIODE
12SQ73 712.60 0GDIODE
12SQ76 612.642 0GAMPL Mut.Cond.1125.
12SR77 112.60 0GDIODE
12SR73 712.60 0GDIODE
12SR76 612.659 15GAMPL Mut.Cond.1900.
12SW74 212.659 15EAMPL Use adapter # 7 to test triode section only.
12SW77 112.60 0GDIODE
12SW73 712.60 0GDIODE
12SX710 412.667 0GAMPL Shorts on 2 and 3.
12SX74 112.667 0GAMPL May show shorts on 2 and 3.
12SY77 712.628 17EAMPL Mut.Cond.750. See note D.
12SY71 712.628 17EAMPL Mut.Cond.750.
12V68 512.667 25EAMPL Mut.Cond.3000.
12W68 512.674 25EAMPL Mut.Cond.7500.
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
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