04-24-2020, 07:43 PM
Welcome! I just finished a partial refurbishment of a PT-94 which uses same schematic as the PT-95. Mine had been well cared for and had all original components. There was a single large dual electrolytic capacitor of 40 MFD and 40 MFD. Schematic showed two 20 MFD electrolytics (items 26A and 26B) so I put in two 22 MFD ones. I replaced the other paper/wax caps and several resistors that were out of tolerance on high side. That included both resistor sections (items 27A and 27B) of the candohm resistor mounted to the chassis. There was one paper/wax 0.2 MFD capacitor (item 5 condenser and coke assembly) that had black wiring coiled around one end. There's no need to coil wire around a replacement cap unless you want to be historically accurate. Also, if you want the loop antenna to work well, you need to heed the note at top left of schematic. I didn't replace all the rubber insulated wiring. Although it is brittle from age, it still looked intact. I did have to replace two short segments when I took the candohm resistor out of circuit. There's a schematic at http://www.nostalgiaair.org/PagesByModel...014176.pdf. I also replaced the incandescent dial lamp with an LED and one tube that tested weak.
I have a short video posted on YouTube of my PT-94 (see https://www.youtube.com/watch?v=kaXbsZhmGaM). Posted below is a photo of my chassis after refurbishing.
I have a short video posted on YouTube of my PT-94 (see https://www.youtube.com/watch?v=kaXbsZhmGaM). Posted below is a photo of my chassis after refurbishing.