Kenwood KT-7500 tuner
Click photo to enlarge
Audio circuit and power supply mods by MPB 12/2006, IF mods and aligned by Bill Ammons 1/07
Top view of modified tuner - click to enlarge.
I purchased this unit used Sept. 2006 on Audiogon, and made the following modifications:
I then sent the tuner to Bill Ammons to re-work the IF filters, add his IF filter board, and align the unit. He also cleaned the RF front end and changed a cap for improved AM performance.
Another Interior shot, click to enlarge.
Audio output circuit, showing OPA2604 IC. Blackgate output coupling caps at right; passive EQ caps (MIT Multicaps) standing up at the left. Click to enlarge.
IF Filters and Ammons IF Filter Adder PCB. Click to enlarge.
Power supply, showing Ammons Negative Regulator PCB at top. Click to enlarge.
References:
FMTunerInfo.com is a wealth of tuner information, especially for the KT-7500: