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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
HD514 400 0HGAS No. 1 OK over 200. Shorts on 4 and 5. See note D.
HD524 4030 0HGAS No. 1 OK over 200. Shorts on 4 and 5. See note D.
HK24G3 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
HY1137 51.50 40OAMPL Mut.Cond.500.
HY114B10 51.543 15EAMPL Mut.Cond.1100.Connect grid to upper left contact of 6-pin socket. Connect plate to upper right contact of 6-pin socket.
HY1157 51.560 32OAMPL Mut.cond.370.OK over 290.
HY1237 51.50 45?AMPL Mut.Cond.370.OK over 290.
HY1257 51.560 45OAMPL Mut.Cond.450.OK over 360.
HY126912 112.670 24BAMPL Mut.Cond.4000. See note A. Shorts on 2 and 5.
HY1457 51.560 32OAMPL Mut.Cond.370.OK over 290.
HY1557 51.560 45OAMPL Mut.Cond.450.OK over 360.
HY694 76.370 27BAMPL Mut.Cond.3500. Connect plate to top contact of 7-pin socket.
KR21 52.540 0ARECT. STD.
KR208 62.52 30CAMPL Mut.Cond.500. No.2 Grid.
KR208 82.52 30CAMPL Mut.Cond.500. No.1 Grid.
KR228 66.32 30CAMPL Mut.Cond.500. No.2 Grid.
KR228 86.32 30CAMPL Mut.Cond.500. No.1 Grid.
KR258 52.557 28CAMPL Mut.Cond. 1750.
KR285 16.340 0BRECT. STD. Plate No.2.
KR287 76.340 0BRECT. STD. Plate No.1.
KR51 56.360 23BAMPL Mut.Cond.2000.
KT638 56.360 24EAMPL Mut.Cond.2000.
KT668 56.374 18EAMPL Mut.Cond.6300.
LA1 56.360 23BAMPL Mut.Cond.2000.
M10609 56.30 0EAMPL Connect plate cap to upper center contact on D socket with lead provided. OK over 900. See bote D.
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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