[Elecraft] K3 and Toyko HY-Power

[Richard Haendel]

I use the Toyko Hy-Power 1.2KFX without ALC and my QRP K3.  I can't overdrive the amplifier and it works just great. My HL1.2 KFX is modified. I removed the input attenuator from the HL1.2KFX so my 12 watts gives me 600 watts typical. Remember,  ALC feedback takes time,  so the amplifier chain overshoots for a few milliseconds before turning down the drive.  This can cause splatter as well as overstressing the amplifier devices. These Toyko Hy-Power amplifiers are well protected as are many from other manufacturers as well,  but ALL transistor amplifiers can't take transients like tube type amplifiers.  I used to design transistor amplifiers for Rockwell Collins for many years. I learned.   Just my 2 cents worth. 
Rich W3ACO