arvin chaissis cleanup gone wrong!

[radiotron]

I have been cleaning up my 1950 arvins chaissis up the past 2 days, and had a good full picture almost all the way restored, i put the 5u4 back in, broke the socket! problem solved, turned the set on bbbbbbbbbbbbbbbbzzzzzzz
pop bell top 5u4 dead! one of the very few caps that tested good left in this is why we do FULL restorations!
also it almost cought on fire! i did get free confetti!

[ggregg]

free confetti from a blown filter cap I'm assuming........

[Geist]

Hi All;
Too bad you didn't get it on Video, It would have been a sight to see..
THANK YOU Marty

[Einar72]

Good thing it didn't blow into an eye! Been there, done that!

[DavGoodlin]

Electrolytic caps can suddenly go crappy on you. I just had it happen to a '64 Zenith AM-FM H845, I tested the 4-section electrolytic OK, but it just started humming a bit more each day and I knew.....I was not done even though I replaced the wax-papers and put a silicon rectifier/series resistor in place of the selenium. should have been first on the list.

I bet the new 5U4 was putting out a bit more EMF..was there a phfffft sound first?

[radiotron]

Originally Posted by DavGoodlin

Electrolytic caps can suddenly go crappy on you. I just had it happen to a '64 Zenith AM-FM H845, I tested the 4-section electrolytic OK, but it just started humming a bit more each day and I knew.....I was not done even though I replaced the wax-papers and put a silicon rectifier/series resistor in place of the selenium. should have been first on the list.

I bet the new 5U4 was putting out a bit more EMF..was there a phfffft sound first?

no, but i have heard that sound, this one i was watching, and it made a pop, then a loud hum i go to turn it off, and sparks confetti,(heck of a mess to clean up) and its being taken to grandpas this weekend

[snelson903]

i just got done this week recaping my 1955 zenith , i think its the first time iv seen a set that every cap none polerized and electrolytics where all bad ,not one cap was even close to being good most just leaky. it turned out great nice sharp picture ,sound nice and clear ,after going through the tuner its like a new set now.

[radiotron]

Originally Posted by snelson903

i just got done this week recaping my 1955 zenith , i think its the first time iv seen a set that every cap none polerized and electrolytics where all bad ,not one cap was even close to being good most just leaky. it turned out great nice sharp picture ,sound nice and clear ,after going through the tuner its like a new set now.

i found the culprit, it was a resistor went bad, and it took out the cap,
heres pictures before it blew (it was just restored, i didnt get to align it yet)
It has a kind of weak picture tube

[bandersen]

I think it's more likely the cap went bad and took out the resistor.

[kvflyer]

Originally Posted by bandersen

I think it's more likely the cap went bad and took out the resistor.

I'm with Bob on that...

[trojanrabbit]

Saw a real good confetti storm once in a previous job. They were working on MRI gradient amplifiers (essentially a big honkin audio amp 300V @ 100A) and had a good sized capacitor bank (probably a dozen large caps) sitting on the bench with an insulator and a DVM sitting on top of it. The power source was a 600V/100A supply adjusted to 350V. One day we heard a hissing sound and someone yelled "DUCK". Apparently the power supply lost regulation and put out full voltage whatever that was. Big confetti storm and the DVM (an HP bench job) was thrown through the ceiling.

[miniman82]

Originally Posted by radiotron

put the 5u4 back in, broke the socket! problem solved, turned the set on bbbbbbbbbbbbbbbbzzzzzzz

Ya know, it's a good thing you work on B&W sets. I shudder to think how many rare color chassis you might have destroyed if you were a color fan, please learn as much as you can on these sets first.

[radiotron]

Originally Posted by miniman82

Ya know, it's a good thing you work on B&W sets. I shudder to think how many rare color chassis you might have destroyed if you were a color fan, please learn as much as you can on these sets first.

i already know about these sets, and i do have colors too.
when i restored it, this cap tested good, it just failed.
its not anybody fault.

[bandersen]

How did you test it ?

[radiotron]

Originally Posted by bandersen

How did you test it ?

I used a scope