Duncan's 1960 Magnavox

[Mr.Duncan]

I wore 15,000 volt gloves, and safety discharged the high voltage lead on the CRT.

I then removed the TV chassis for inspection.

The flyback transformer looks a little melty. Some of the wax fell off / melted off. I don't see any signs of arcing inside the metal case of it.

I contacted Moyer for a replacement / spare and had no luck.
If anyone has a good used / NOS one let me know! - I'm looking into how to re-coat the flyback?

Flyback Part#: 360779-1
Other part #s:
Merit HVO-172
Thordarson FLY-179

PXL_20240723_230154818 by Thomas Duncan, on Flickr

PXL_20240723_232412518 by Thomas Duncan, on Flickr

PXL_20240723_232419443 by Thomas Duncan, on Flickr

PXL_20240723_232757786 by Thomas Duncan, on Flickr

PXL_20240724_204340786 by Thomas Duncan, on Flickr

PXL_20240724_204344225 by Thomas Duncan, on Flickr

PXL_20240725_011805289 by Thomas Duncan, on Flickr

PXL_20240725_011814477 by Thomas Duncan, on Flickr

[Mr.Duncan]

I removed each paper/wax cap and started replacing them with film caps.

Again, I heard and read the diagrams online, it seems these yellow film caps are not polarity sensitive?

Most of the caps were rated to 400v, the replacement caps I used were around 600-630v. Same uF factory rating with a tolerance +/- 10%

PXL_20240730_204949224 by Thomas Duncan, on Flickr

PXL_20240801_010015986 by Thomas Duncan, on Flickr


PXL_20240801_010041094 by Thomas Duncan, on Flickr

[Mr.Duncan]

I know any normal electrolytic capacitors ARE polarity sensitive, and should never have the + terminal installed to chassis ground.

I don't understand why the diagram shows Cap #4 with + to ground.

I thought it was a typo, but the OG capacitor was installed in the same way.

So, I installed the replacement 2uF / 50v cap with the + terminal to chassis ground.

PXL_20240803_005803186~3 by Thomas Duncan, on Flickr

OG cap:

received_1052973953063467 by Thomas Duncan, on Flickr

New cap:

received_1249401692693103 by Thomas Duncan, on Flickr

[Mr.Duncan]

I ended my day with a visit to the local Houston EPO store.

Picked up a nice looking, and working! Tube tester.

PXL_20240803_141622095 by Thomas Duncan, on Flickr

PXL_20240803_153220060 by Thomas Duncan, on Flickr

PXL_20240803_153226760 by Thomas Duncan, on Flickr

PXL_20240803_163259167 by Thomas Duncan, on Flickr

PXL_20240803_164418694 by Thomas Duncan, on Flickr