TM 55-2840-251-23
7-2 ELECTRON TUBES (Continued)
7-2-3 TESTING
1.
lace test set switch SW1 to OFF.
2.
Install electron tube in test set socket SKT2.
3.
Place test set switch SW1 to position 1.
4.
Adjust test set rheostat VR1 until voltmeter reads 6.5
±
0.5
volts at Mi.
5.
After three minutes, check reading on test set
ammeter M2. For electron tubes P/N 3008040, the reading
shall be 3.0 to 3.5 amps, and for tubes P/N 3014055, 3.3 to
3.8 amps. If not, replace tube.
6.
Adjust test set rheostat VR1 until voltmeter reads
19.5 ±
0.5 volts.
7.
After three minutes, check reading on test set
ammeter M2. For electron tubes P/N 3008040, the reading
shall be 3.7 to 4.1 amps, and for tubes P/N 3014055, 4.2 to
4.6 amps. If not, replace tube.
8.
Put test set switch SW1 to OFF.
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