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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
3B221 52.540 0ARECT. STD.
3B224 52.540 0ARECT. STD.
3B2310 42.555 0ADIODE Connect tube cap away from operator. See notes A and D.
3B2310 42.555 0ADIODE Connect tube cap nearest operator. See notes A and D.
3B247 12.55 0ARECT. STD. Shorts on 4 and 5. See notes A and D.
3B267 22.520 0EDIODE See notes A and D.
3B287 12.540 0ARECT. STD. See notes A and D.
3B297 22.520 0ADIODE See notes A and D.
3B5GT8 52.554 49EAMPL Mut.Cond.1500. Shorts on 4 and 5.
3B76 62.535 25FDIODE Shorts on 4 and 5. Plate No. 1. Reads in Green Sector
3B71 62.535 25FDIODE Shorts on 4 and 5. Plate No. 2. Reads in Green Sector
3BA67 9370 0KAMPL Mut.Cond.4300.
3BC57 9355 19KAMPL Mut.Cond.1600. Shorts on 4 and 5.
3BE67 9355 23KAMPL Mut.Cond.1600.
3BN610 430 0KAMPL Mut.Cond.500.
3BY64 9347 28KAMPL Mut.Cond.1200.
3BZ61 9364 17KAMPL Mut.Cond.2500.
3C239 2340 80ARECT. STD. Tube strikes at approximately 26 when R control is rotated counterclockwise. See notes A and D.
3C243 26.330 20AAMPL Connect top terminal of tube under test to upper contact of 5 pin (B) socket. Use separate lead provided. Connect side t
3CB61 9362 18KAMPL Mut.Cond.2200.
3CF61 9362 18KAMPL Mut.Cond.2200.
3CS64 9330 33KAMPL Mut.Cond.800.
3D66 22.561 30FAMPL Mut.Cond.2100. Shorts on 1. See note E.
3E294 212.670 14EAMPL Plate No. 2. Use Adapter M-418.
3E297 212.670 14EAMPL Plate No. 1. Use Adapter M-418.
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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