1951 AMC 16" TV Restoration

[Crist Rigott]

I got some more done on the chassis recapping.

I changed out the cap "C46" and resistor "R62"on the "Contrast" and "Horizontal Hold" control.

I then began recapping and rewiring the fuse and selenium rectifier. I'm using a terminal strip for each. I'm using pigtail fuses. For the rectifier, I'll wire the original selenium in then get some voltage measurements, then change it out for a 1N4007 diode. Then I'll adjust the existing 22 ohm resistor "R77" to match the correct voltage needed.

I'm needing my .2uf 630v caps from Just Radios to really get into recapping. The caps are "layered" and I'm not going to do much till I have all the caps on hand. There is some that I can do though. Just a limited amount.

I also changed out another cap "C54" and one of the heat stressed resistors "R77".

[Crist Rigott]

My order from Just Radios arrived. I emailed my order to Dave on Wednesday and he mailed it last Thursday. Wow, great service.

My friend provided me with some tubes and other parts so now I have all the parts to complete the restoration.

Stay tuned.

[Crist Rigott]

This evening I got a few more caps replaced and finished the section around the E-Caps.

I also discovered that my vertical output transformer primary was open. Luckily, my friend had a replacement listed in the Sams parts list. A Merit A-3036. This was also installed tonight.

Tomorrow I'll work on finishing up the HV cage and on to the other film caps.

[Crist Rigott]

I made some good progress today.

The HV cage is done. I replaced the .00047uf 10,000 volt cap with a .00047uf 15,000 volt cap and the 2 680K 2W carbon comp resistors with some new 3W resistors.

I started to replace the paper caps on the section that I started work on. Some of the paper caps were "buried" under other components. This causes a lot of other components to be lifted to gain access. I decided to go ahead and replace all the resistors along with the paper caps in the Horizontal section.

I'm including some pics of my progress. Also a picture of the enlarged schematic that I'm using and I high light the components when they have been replaced. Pretty much the horizontal section.

[Crist Rigott]

My progress so far.

I did an interim power up. I got a raster but low audio and it appeared no tuning.

We'll see what happens on the next power up.

[Crist Rigott]

I finished replacing the caps and resistors.

I now have good audio and tuning.

I do have a problem with the video. It looks like multiple test patterns across the screen. I think I read somewhere that the horizontal frequency might be off? Any suggestions?

I'll go over what I replaced to see if I made a mistake.

The B+ is 329v compared to SAMS 340v.

Thanks for your help.