[Amps] Why hasn't solid state replaced tubes?

[Doug Hall]

> My IC706 mobile puts out up to 180w pulse depending on supply
> voltage, even
> when cranked down to 10 watts. My FT1000D will overshoot also if I don't
> keep the drive control down.

I've actually found the overshoot problem to be worse when my rigs are
operated at lower power levels. Here is what I measured using a 2Gs/sec
digital scope on 3.5 MHz:

my Icom IC-706Mk2G, one of the first Mk2G production units:

pwr	spike	overshoot
===	=====	=========
100w	100w	    0%
 75w	 91w	   21%
 50w	 73w	   46%
 25w	 52w	  108%
 10w	 26w	  160%

Run at 13.8VDC into a 50 ohm load.

However, last year we bought another Mk2G here at work to do some testing
with. For grins I measured it and found it to have significantly more
overshoot - nearly 120w when set for 100w out, and the other power levels
had more overshoot as well. So your mileage may vary. 180w is awful.

73,
Doug, K4DSP