Scored an Admiral 19A11

[Crist Rigott]

An update of my progress. The HV caps came in so I started with the HV section. I replaced all the caps and resistors, and thouroughly cleaned all surfaces. I removed the phenolic board and pots and cleaned them too.





I then installed a fuse holder in the AC line going to the ON/OFF switch. I used an existing holes and just removed the wire from the interlock and folded it back to the fuse holder and installed a new brown wire from the fuse holder to the interlock.



I then installed C1 and wired that.



Then C2 was replaced with a terminal strip and 2 E-Caps. The ground terminal was soldered to the chassis like all ground terminals are. The terminal strip was placed in the same location as the clip was for C2. The wires were then just tacked in place so I could do a power up.

[Crist Rigott]

I'm replacing the components in the Horizontal and Vertical sections right now. I thought that I would include a picture of how I arrange things when I'm doing a section of the chassis.

First thing I do is take some close up pictures of the area. Then using some lined notebook paper and a pencil, I draw out what is connected. For example let's say a tube we'll call V12. I draw a circle and place the key way and 8 dots which represent the terminals. I then draw a resistor going from pin 1 and the other end of the resistor I list where it goes like #3 V13, and so on. I also draw in what ever is connected to that terminal like wires, coils, etc.

Then I clip out the components that I'll be changing out. I lay then next to the chassis then I measure the resistance of the clipped out resistors and record them on my spreadsheet. I then get a new resistor and measure that and again record it on my spreadsheet. I dig out the the new caps too. I placed the new components next to the old ones. I then clean up the terminals and clean them using an acid brush and acetone. I then make any repairs needed to wiring etc.

Then I start to install the new components. It's like building a kit now! After soldering, I again clean the terminals with acetone.

Then take a break.

[Crist Rigott]

The Horizontal and Vertical sections are finished. Today I'll power it up and see my progress.

[Crist Rigott]

I did the audio section today. Here are the before and after pictures.

[Crist Rigott]

Today I worked backward through V9 the Ratio Detector, V8 the sound IF, V7 the Video Amp, V6 the video detector, V5 the 3rd Video IF, and V4 the 2nd Video IF. All that's left is V3 the 1st Video IF and the Tuner.

[Crist Rigott]

BTW, I got a original Sams Photofact for this TV. It's Sams 59-2. I scanned it and sent Steve at ETF a compressed pdf copy that is much better than what's up there now. Looks like Steve did some further compression and the copy isn't all that good.

Never fear. I've uploaded the full resolution pdf in my dropbox. You can enlarged it at least 400X and it is still very readable. Here's the link. Caution large file @16Mb.

https://www.dropbox.com/s/o0f1yge36v...059-2.pdf?dl=0

[Crist Rigott]

OK, I have a concern that I need cleared up. There are these ceramic capacitors used in this TV, mostly in the IF stages. I call them "Hot Dog" caps because they look like hot dogs. Seeing they are ceramic I haven't paid too much attention to them when I do a recap. On this chassis I'm down to the last tube, tube V3, and decided to check some of these caps because they were already disconnected while I'm replacing the resistors. Well, to my amazement the 5 I checked were well out of tolerance......I think.

According to the the Sams parts list, C12-C16 (the ones I checked) can use Aerovox 1468, Cornell-Dubilier 1W series which both are mica caps. I looked in the 1951 Allied catalog and the C-D mica caps have a tolerance of +/- 20% while there was no tolerance listed in the Allied catalog for the Aerovox caps.

In the picture of the schematic below I have penciled in the readings I get for each capacitor. They are:
C12 - 1623pf
C13 - 1431pf
C14 - 1931pf
C15 - 1707pf
C16 - 1230pf

Should I check all of those hot dog caps and replace them too? I've never replaced those before because I've always thought they were good. Now I'm not so sure.