[Elecraft] Hold on here!!! DX-40 based amp, Class C PAs in general.

[Lee Buller]

>  The DX-40 is strictly a CW rig, and would
>require a ground-up redesign for SSB service.
>
>Ron AC7AC
>K2 # 1289


This is very wrong.  All you need is a different bias supply.  And it is 
easy.  Yep, done it too.  My rig when I got my General was a DX40.  I got a 
hold of an SB-10 SSB generator.  I built a power supply for the SB-10.  The 
SB10 was a phase angle SSB generator where you had to null out the sideband 
and the carrrier.  So, I took the drive out the 6CL6 and that was fed into 
the SB-10 where I then did the SSB Magic...and then drove the SSB signal 
into the 6146.  All you needed to do was to make a bias supply which I did 
on the SB-10's power supply I had built.  Adjusted the thing for 60 mills 
of resting plate current and I was off to the races.  SSB with a SB-10 and 
a VF-1.  I was desparate at the time and that was all I could afford (18 
years old and real stupid)  To modify the bias circuit, you have to lift a 
couple of resistors and apply the correct bias voltage.  There was a 
article about this years ago in either CQ or 73 Magazine.  I use to have 
the copy of it, but that was over 30 years ago.  By the way, they did this 
all the time with the SB-10 and the DX-100.

It can be done!!!!!  And for CW, class C is fine.

Lee - K0WA