you can have a nice small 25 watt transmitter/exciter requiring only
four tubes and NO modulation transformer. Hi-fi and no iron required.
What's not to like?!? The transmitter output is adjustable from zero to
twenty five watts output with 100% modulation. If you run about 15
watts the positive peaks will be somewhere around 115% while the
negative peaks remain below
Here's a high resolution PDF version of the schematic, suitable for printing.
Check out some photos of the rig.