In figu
http://1fcr.com.ar/classB.jpg
you can see a very interesting diagram of the audio modulator of an old AM
Gonset transmiter.
A 12AT7 as voltage amplifier. one 12AU7 with both triodes in parallel as
power amplifier and two 6DQ6A grounded cathode, grounded control grid with
audio input to the screen grids working push pull as pure class B.
R211 and R212 are only used for measurement purpose.
Why would they choose to use the screen instead of the control grid as input
? . Any suggestion ?
--
Alejandro Lieber LU1FCR
Rosario Argentina
Real-Time F2-Layer Critical Frequency Map:
http://1fcr.com.ar
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