John Innes on asymmetrical modulation

Solid State Transmitter Installation Considerations

Solid state transmitters differ in certain respects from tube transmitters, and it is advisable to take this into consideration at installation time.  The checklist should include cooling, power line transient protection, load impedance matching, grounding and audio limiter settings.

Digital AM - Don't throw away that Ampliphase Transmitter

Perhaps you want to dip a toe in the water when AM digital tests start, probably with a DRM exciter, and are wondering about transmitter conversions.