Zenith 7H02Z Restoration

 This is a 1951 Zenith 7H02Z table radio I restored for a friend. It was cosmetically a bit rough, and had numerous electrical issues: intermittent I.F. transformer, bad electrolytics, several out of tolerance resistors, dirty tube pins, 1 bad tube, bad chassis grounds, etc. Once that was all resolved, it was brought up on a variac, a full alignment, and was playing nicely. 

Cleaning all the nicotine from the cabinet was a task, but that and polishing turned out great. I had to paint the speaker grill and polish the Zenith badge. Overall, this restoration was a success. Here's some pics and a few videos...

NewMar 115-12-35AR

 This is a cool NewMar 115-12-35AR linear power supply. 35A, very over-engineered, crowbar protection, and SUPER quiet. No birdies in your radios, etc. NewMar does a lot of gov't, Aviation, Marine, RV etc stuff, and their stuff is the top of the line in power supplies, inverters, distribution, etc. 

This supply is designed to be remotely installed, and has a terminal strip on the front for remote switch, remote monitoring, and remote alarm display. 

I'll post one of my toilet paper schematics I scratched up on a piece of scrap paper. This wouldn't engage the main start relay, due to a resistor that had shot up front 2.42 k to over 10 k. The video explains it better. Here's the vid and some photos...

The dc voltage was low, so I first suspected this cap, but it was good. 

These are the two resistors in the divider. The top 2400 ohm had shot to over 10k!

The diodes was in good shape...

This is the new resistor. A little beefier, and put the coil voltage back where it should be. 

Output was great. 

This jumper is where you would normally attach a remote switch.

My toilet paper schematic :-)...