Many thanks to SWLing Post contributor, Jesse (W9JES) who writes:

I’ve been busy enhancing my Radio Shack DX-390. I added an IF-Out jack for my SDR, changed out the light for a LED, added a latch circuit for the light switch, added static protection, and disabled auto-mute. My blog with full instructions is at www.w9jes.com

Thank you, Jesse!  Here are links to the various modifications Jesse has documented:

• Part 1 Disable Mute
• Part 2 Lights
• Part 3 Static Protection
• Part 4 Panadapter
• Radio Shack DX-390 / Sangean ATS 818 Files
• Mod services prices

Click here to check out Jesse’s website.