Motorola 14P3 restoration

[bandersen]

I picked up this set along with some other vintage gear a few months ago and promptly forgot about it. A few days ago I was cleaning out the garage and stumbled across it. I figured this was a good a time as any to take a closer look.

It sure is dirty


Specifically, it's a Y14P3-2. The -X part indicates the cabinet style.


I'm not sure if any of these are the correct knobs.


It's looking a little more respectable after some cleaning.

[bandersen]

Here's what I found inside. Aside from some dirt and cat hair, it looks OK.




Time to check that 14RP4 CRT.


Uh-oh!

[snelson903]

hay im glad to see you do that ,iv had a motorola for some time that the crt is dead like that and i have been keeping it hoping some day to run across another crt that good, can that procedure be done using a b k 467 or sencore 133 if so id like to try to bring back to life. 17cfp4 crt the label says, i dont know why someone bent the tuner cover up like that, i just put it away after testing the crt . i just checked the crt and woke it up and wiggled the horz. osc. tube around and it came on. looks like just needs recap and tube sockets replaced or tightened up.

[earlyfilm]

Originally Posted by snelson903

. . . . . i dont know why someone bent the tuner cover up like that . . . . . .

Back in the day, everyone used big-can spray tuner cleaner, and they obviously misplaced their little squirting tube before doing this set.

This butchery is very common on tuners where the cover was soldered in place for better shielding.

[snelson903]

the moto i showed pictures of here on bandersen thread awhile back has made it to the west cost undamage via the u.s postal service , and is now safe in the hands of the boobtubeman. i guess you can trust the postal service as long as you intomb it in a cocoone ,so they can still use it as a football. lol

[Eric H]

Ah shoot, the tube is dead, well guess you'll just have to part it out now.
I'll take the safety screen.

Are you sure it's a RP4? I have the old 14QP4 from my Philco Transitone, it's kind of weak but it makes a pretty good picture.

[bandersen]

The fusistors have exploded in several of the Predictas I'll be working on soon so I'll have to rig up a replacement like you did.

I struck out on finding any knobs. Oh well, I'll just go with what I have.

I've moved on to cleaning up the cabinet and safety screen. One corner is damaged but I was able to flip it 180 and it's not as visible.


Here it is after a whole lot of polishing. I used Kat Scratch Out and Meguire's Cleaner Wax on the cabinet.

[bandersen]

Oh, I'm not giving up that easily! The filament is glowing nicely - there are just no emissions. So I tried the old cathode re-welding trick and after about a dozen whacks got it to stick

Yes, it sure is a 14RP4. Those "lumps" on the top and bottom seem kinda odd.




There's not much to this set and I hope to fire it up later tonight

[bandersen]

If anyone is curious, this is the cathode welding procedure I used.

http://www.videokarma.org/showpost.p...4&postcount=30

[Eric H]

Cool, you got it working, I wonder if those Lumps are there to give the glass some strength? Looks like an early attempt at a higher angle deflection tube.

I have this same set in Pink, it almost works, at least it lights up fully but doesn't seem to pick up anything.

[zenithfan1]

I've seen those lumps on several Zenith sets I've worked on, I too have wondered what they're for.

Good job on getting that tube going, the CR 70 is awesome. Looking forward to seeing that CRT light up.

[bandersen]

I finished a quick recap and tried to power up the set - nothing. I traced through the filament string and eventually found a tube that wasn't seated fully.


Bingo! I have a nice bright raster Now to try feeding in some signals.

[snelson903]

Originally Posted by bandersen

I finished a quick recap and tried to power up the set - nothing. I traced through the filament string and eventually found a tube that wasn't seated fully.


Bingo! I have a nice bright raster Now to try feeding in some signals.

you work on lot of these set's ,have you ever replaced the selenium. rec before with any modern diodes before , and if you did how did turn out.

[Phil Nelson]

I replace selenium rectifiers with type 1N4007 diodes, which are more than adequate and work fine. They cost a few cents. Take the old rectifier completely out of the circuit (don't bridge the diode across it).

Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html

[snelson903]

Originally Posted by Phil Nelson

I replace selenium rectifiers with type 1N4007 diodes, which are more than adequate and work fine. They cost a few cents. Take the old rectifier completely out of the circuit (don't bridge the diode across it).

Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html

oh no i never leave any old comp. behind if it bad it goes, is there in some application a resistance issue ,like there was more of a voltage lost across the old rect. than in the modern diodes so that you would have to add a resister so the output would match the old rectifier. i see that 1n4007 has 50a surge but opperates at 1amp is that all that circuit draws is under a amp of current.