If you see the review for the Realistic TM-1001 it reads :
Realistic TM-1001 (1979, $180, photo, schematic) - Much more attractive, cosmetically, than the TM-1000, the TM-1001 is solidly built, with 4 gangs and 4 filters. Based on input from former Shack employees, we now believe that the TM-1001 was built by Foster Electronics for Radio Shack. Our panelist Ed comments: “Before mods, the T-1001 lacks sensitivity and isn't very selective with its stock 280 kHz filters. After adding an amplified filter board and replacing the stock filters, it's a pretty good tuner for the money spent. Selectivity can be as sharp as you want to make it, and the AFB really picks up the sensitivity. The stock output caps must go. Realistic's 'Auto-Magic' tuning is a nice feature - it's similar to Sansui's quartz lock, but Realistic thought to make Auto-Magic defeatable.” The TM-1001 usually sells for $35-70 on eBay, with a high of $99 for a stock one, and a TM-1001 with audiophile and DX mods sold for $225 in 10/03. See how one TM-1001 sounded compared to other top tuners on our Shootouts page. Although the TM-1001 was Realistic's best tuner, some say the real Shack surprise is the STA-2280 receiver, which has excellent sensitivity and is great for DXing after a filter mod. According to Ed, other Realistic receivers like the STA-2500, 2600 and 2270 are also worth a try. [EH][JR]
Per fmtunerinfo.com