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Design Example - Cathode Follower
Assume that tubes 828 and 849 in Fig. 157 operate at EB = 1,700 volts. With Ec = -75 and 700 watts output, 849 plate swing is 1,200, Emin = 500, peak grid voltage = +105, and peak grid current is 0.090 amp. This is peak load for the 828 tube which can operate class AB1. The 828 tube plate swing is 1,200 + 180 = 1,380, or Emin = 1,700 - 1,380 = 320 volts, and the 828 peak load is 105/0.090 = 1,170 ohms. The cathode choke of 828 and the grid chokes and capacitors of 849 should have 1.41 · 1,170 = 1,650 ohms reactance for 100 per cent modulation at frequency f1. At 10 cycles this would be 27 henrys. Peak voltage across these chokes is the 828 plate swing.
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Home Amplifier Circuits Design Examples Cathode Follower |