Hello,
Im trying to modify one old transistored beacon with modern front end and keep the old final amplifier. The problem is like this way........................
I have an old beacon amplifier with 4 transitstors, 2 in pairs. Max. output by the papers are 100w and pep 400w. Im including you the schematic,
My project is to remove everything from the final driver board and front and keep from T202 and rear, the finals, the output transformer etc.
Now to make some experiments, i made one new T202 made from 32 turns primary and the secondary is 7+7 turns. 32 turns is the original one but with a center tap. I was rewind it without the center tap. Im using one class A amplifier to drive the finals. BUT i get a very distorted signal in oscilloscope. im sending you some screenshots to get an idea, by the way, it is a AM carrier and with CW modulation. It is a beacon for direction finding. and working real low 400-500Khz, and thats the reason for the wattmeter.
here is the original schematic
remove everything from T202 and to the left
next is the driver that i made