Headphone jack tip, aftermarket speaker plug warning.
Njord, welcome to AK!:thmbsp:
You got a real nice score (a FM signal meter calibrated in uV is a real plus!)
I have the FM only TR-2040, and I used it at one of my last jobs where if you wanted music at your bench it was "No speakers, headphones only" rules.
The preset setting controls always needed cleaning but once set, they stayed put.
You may notice the headphone jack works best with the 1/4 inch plug not fully inserted into the jack, pulled back about 3/16 of an inch from "bottomed out".
I "fixed" this problem using a collar of clear shrink tubing on my headphone plug that is about 3/16 inch wide, shrunk enough to not be loose or fall off, this seems to be an issue of what shape the plug tip is, rounded, tapered, pointed etc., your results may vary.
Because my situation with electrical interference (and not a good antenna) I completely lined the inside of the wood part of the cabinet wit tin foil and put in an IEC 3-wire filtered power AC input, and put some small bypass capacitors on the headphone lines at the jack.
This improved my signal to a point where I got good reception MOST of the time (being in an industrial park, the power lines\airwaves where somewhat noisy).
As to to speaker connections, if your set uses the "flat pin round pin" type if plug, beware of the aftermarket replacements, they tend to use a soft plastic that melts quickly when you try to solder to the plugs.:sigh:
The plug will get hot and fall apart before you can finish soldering, you must have a way to support the contacts while soldering!:yes:
To minimize the problem, put your speaker wires through the supplied cap, take the bare plug and insert it into the receiver jack (unplug the set from the AC line!) then solder your wires to the plug pins and let it cool COMPLETELY TO ROOM TEMP. before handling\assembling the plug assembly!:yes:
One day I will put standard speaker posts on it.:scratch2:
Hope this helps!
Mark T.