techs: wet/dry pot for echo

Not sure what you're asking, but I've dealt with echo boards before so I'll attempt to answer. Does your radio have echo? If so does it not have a knob that not only turns the echo on/off but also allows you to determine how much of your voice gets "echo-fied" (if you will)?

 

Along the lines of Turbo-T's response, isn't this what the Dual control for echo suppose to do? Should have 2 knobs, probably stacked. One should control the delay, the other the "reverb" or wet/dryness. Turn the latter up too much and you sound like the janitor in drumb, like your inside a barrel. The first is the echo, the repeating.

If your wanting the echo to sound clean, which is what your post seems to indicate, don't turn the knobs very much at all. I know with my General Lee, there was no instructions, so I had to find out where to set this, by trial and error. Easiest way was to crank it up and have someone tell me to turn it down. When they did, they pretty much committed themselves to helping me adjust it. I tried setting it using the Talk-back, but was not hearing much of it through that. I don't have an external speaker, and the speaker on the radio wasn't giving me much help.

 

And if you run SSB, turn it all the way off...

 

I don't recall of any 959's coming factory with echo. The GL's did though. Have you tried ch. 38 on SSB? You may not get any "local" SSB traffic, but you may get some DX traffic such as there was today about 30 minutes ago. I talked to 292 in Huntsville AL on 38 LSB, then made a contact to Salt shaker on ch 15 AM.

 

Same applies for AM

 

Rockin,
Most SSB radios, even solid state ones, still need a few minutes' warm-up time. As some of the parts heat up under normal circumstances, they can change the values of the parts in the synthesizer and heterodyne oscillators (depending upon how your radio makes SSB from what would otherwise be an AM signal.)
I generally figure on about 20 minutes for any of my SSB gear to warm up enough to minimize drift, from my Hammarlund boatanchor receivers to my Griefkits and Emperor Shogun mobile. On cold days it can be longer, although it's nothing here in Mayberry RFD like it was in Bareflanks, Alaska.
The only way I know to avoid it is to put the crystal in an oven and run a small incandescent lamp near the synthesizer that's always on.
73