G'day Steve

> > If you hate the constant sound of the fan running while just listening
> > on you 706 then you should try this simple mod!!
> > 
> > On the PA unit locate R65 47ohm next to the J1 coax plug on the left
> > edge of the board near the fan wire plug remove it "requires a bit of
> > heat and a small screwdriver to pry it of the board" and replace it
> > with 100ohm half watt. lower values will make fan run faster but more
> > noise you can try different values to find one that gives the air flow
> > you want and the noise level you are comfortable with. this mod does
> > not effect the hf tx fan speed or operation just the fan speed when in
> > rx
> 
> 
> What about a mod to keep it from following the keying. That bothered me.  I
> would tap the key and the fan instantly sped up as if connected to the key! 73

I did not think anyone would want to change the hftx fan speed and
beware the 706 does need airflow when using hf! but you have a few
options with the tx fan speed i think looking at the curcuit!! if you
remove R 42  1k small smd, located between Q15 and the electrolitic
cap close to the fan plug that should disable the fast fan in tx and
it should just run normal rx speed or the speed after the first mod
but i would not recomend doing the first mod if you disable the fast
speed on tx. or another option could be R 41 22 ohm large smd close to
the back edge of the board right next to fan plug and replace it with
a higher value half watt that should slow down both tx and tx fan
speed but still alow a faster fan speed when in tx you would need to
try a few value's to find one you are comfortable with! anyway let me
know how you get on if you try one or the other sugestion  i looked at
doing somthing because it was so anoying hearing the fan running when
the radio was quiet. 

good luck!  
--