It is snowing here today, so I am stuck in the hamshack. YEA!
I've had the Hammarlund HQ-100 receiver on the bench because I am building an outboard digital frequency readout for it and for the DX-100. More on this later. But as long as I had it on the bench I decided to do a mod to the audio output that has LONG been needed.
Here is a nice web page that describes the problem and the solution. The problem is the "Auto Response audio output circuit" touted in the add up above. Essentially I had to remove the touted circuitry. The AutoResponseectomy only took me about 15 minutes and the results are quite noticeable. The old receiver sounds a lot nicer. I'm listening to 40 meter AM now. FB.
Here is the page:
The HQ-100 does indeed have "three dimensional beauty."