Philco Briefcase 19 - Videokarma.org TV - Video

Radiotronman · #1 05-03-2016, 09:45 PM

I gott a couple of these 19" Philco briefcase tvs and decided to restore this cool aqua colored one. The CRT tests great, now to conquer the predicta-like chassis in this set. Ive ordered replacement caps and I'm waiting for them to come in. I find working on these pcbs to be a fun change, but definitely gotta be cafeful with the heat when soldering. The insides were filthy and I cleaned the crt, a 19AMP4. You pretty much have to take the face off, with crt attached, to access half of the chassis. Should be a fun restoration.

Radiotronman · #2 05-03-2016, 09:48 PM

Here is the chassis with CRT and face off.

Radiotronman · #3 05-03-2016, 09:50 PM

Picture with just the back off.

decojoe67 · #4 05-04-2016, 06:44 PM

I have a restored Seventeener III that plays flawlessly. It reminds me of the 1960 Admiral I watched as a kid that was equally as good. Fun sets.
Good luck with the resto.

Radiotronman · #5 05-04-2016, 11:07 PM

Sorry the picture isn't very clear. But on these top hat diodes , which side is the "in" or "out". I want to replace them with modern diodes, which has the cathode line at one in. I can never remember which way they go and don't want to waste my fusistor finding out...

Electronic M · #6 05-05-2016, 12:10 AM

IIRC the brim of the hat is the same thing as the band on a modern diode.

If one is good the diode/ohms mode of your DMM will tell you.

dieseljeep · #7 05-05-2016, 10:17 AM

Quote:

Originally Posted by decojoe67

I have a restored Seventeener III that plays flawlessly. It reminds me of the 1960 Admiral I watched as a kid that was equally as good. Fun sets.
Good luck with the resto.

The Briefcase 19 was a better performer, than the Seventeener III. The S III always seemed to have tuner problems, but the CRT's always seemed to be good.
The Admirals, that were similarly styled, stood up better, but the CRT's didn't last as long. IIRC, National Video sourced.

reichsrundfu · #8 05-05-2016, 12:24 PM

Sweet. Built in multimeter and everything ...!! Sorry just couldn't resist

George

Radiotronman · #9 05-06-2016, 11:38 AM

Well I replaced the electrolytics and get a brief raster before a 10uf 450v electrolyric gets hot and kills the raster. I'm going to find the schematic and see what's going on here. This section if a 4 section electrolyric goes to the height control.

dieseljeep · #10 05-07-2016, 07:21 PM

Quote:

Originally Posted by Radiotronman

Well I replaced the electrolytics and get a brief raster before a 10uf 450v electrolyric gets hot and kills the raster. I'm going to find the schematic and see what's going on here. This section if a 4 section electrolyric goes to the height control.

That cap is in the boost circuit. The boost, generally furnished the plate voltage for the vertical oscillator circuit. More stable!

Radiotronman · #11 05-09-2016, 08:54 PM

Well that cap keeps getting way too hot and the 33k resistor with it keeps getting hot and opening. While it lasts, the picture looks good, the width bounces from the right and shrinks back and forth.. Any ideas why?

Kevin Kuehn · #12 05-09-2016, 10:10 PM

About the only things that makes an electrolytic get hot are leakage current, installed backwards, or AC across it. You checked the damper tube?

Radiotronman · #13 05-10-2016, 04:00 PM

The electrolyric is in right and the damper tests good. Another collector mentioned shorted windings in the yoke may cause this?

Kevin Kuehn · #14 05-11-2016, 03:07 PM

What's the model number/schematic for this set? I'm curious to take a peek at this circuit.

tom.j.fla · #15 05-11-2016, 05:46 PM

Sams set 531 folder 2. All the best, Tom