Operating instructions

Authorities agree that the average voice power is 20 to 20 db

below peak voice power. Normally, some peak clipping in

the power amplifier can be tolerated, and a peak-to-average

ra tio of only 6 db may sometimes occur. Under such con-

ditions, the average power input will be 80 watts, and aver-

age plate current will be 100 ma. With power amplifier effi-

ciency of 65 percent, plate dissipation will be approximately

26 watts. The 6LF6 is rated at 40 watts, continuous duty

cycle, in normal TV service. "n1US it can be seen that under

normal operating conditions, the Power Amplifier tube in

the 101lB is not being driven very hard. Note, however, that

proper modulation level must be maintained by correct set.

ting of Mic. Gain, and that the length of time in TUNE posi-

tion must be limited to not more than 30 seconds at a time.

5498

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40DB-

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60 DB.

80 DB-

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FIGURE 5. CRYSTAL FILTER CHARACTERISTICS