Filter capacitors get replaced, all the tubes get tested, then we test the receiver for improvements! This is Part 4 of the RCA CR-88 Restoration, a part of the GRR Series. To learn electronics in a very different and effective way, and gain access to Mr Carlson's personal designs and inventions, visit the Mr Carlson's Lab Patreon page here: https://www.patreon.com/MrCarlsonsLab