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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
313C2 10500 0ADIODE Good tube gives meter reading. May read in red sector. See note D.
313CC2 10500 0ADIODE Good tube gives meter reading. May read in red sector. See note D.
313CD2 10500 0ADIODE Good tube gives meter reading. May read in red sector. See note D.
322 5219 30AAMPL Mut.Cond.640.
328A8 57.554 16CAMPL
329A7 67.562 33BAMPL
32L711 53540 0ERECT. STD. See note D.
32L78 53571 18EAMPL Mut.Cond.4800.
32L711 5350 0ENOTHING Test for shorts.
331 5250 29BAMPL Mut.Cond.1450.
336A8 51060 20CAMPL Allow tube 60 seconds to warm up. Set MICROMHOS switch at 6000. OK over 750.
337A2 51050 16CAMPL
338A1 61040 80BRECT. STD. Tube strikes at approximately 35 on R when this control is turned counterclockwise. See note D.
339A12 1560 45BAMPL Set MICROMHOS switch to 6000. OK over 1250. See notes A and D.
342 5214 27AAMPL Mut.Cond.600.
345A7 76.340 0BRECT. STD. Allow tube 60 seconds to warm up. See note D.
345A4 36.340 0BRECT. STD. Allow tube 60 seconds to warm up. See note D.
348A1 96.348 18EAMPL
349A8 56.367 30EAMPL
357 62.542 20BAMPL Mut.Cond.1020.
350A12 16.373 27BAMPL See note A.
350B8 56.373 27EAMPL
352A10 3100 0CDIODE
352A10 6100 0CDIODE
352A7 61028 20CAMPL
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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