[Lowfer] Re: Amplifiers for 136k

[Ron L. Sparks]

I have a random story about amplifiers for 136K.  Several years ago my
daughter and I were experimenting with Sonoluminesce and needed to drive
some piezo (capacitive load) transducers at 40 KHz with lots of power.

I dug out an old (1980's) pro-sumer audio amp I had picked up at a
swapmeet for $5.  It put out a clean 125 W RMS per channel at 20 KHz.
But, the amazing thing was that at the 40 KHz it was still cranking out
60 W or so.  Just for fun I loaded it out to 4 ohms and found it would
do about 25 W with a 100 KHz drive.  (So that's why my tweeters blew out
when I over drove my amp -- square wave harmonics from the clipped
signal ;-)

Yeah, I realize there are a million reasons why this would not work at
136K.  But if you could find the filters that are creating the roll off
and do a little tinkering -- you might could turn a $5 piece of junk
into a low distortion, class AB, 2 ohm capable, 136K amplifier.

Just a thought.

Ron