1950s RCA B & W TV - Page 3 - Videokarma.org TV - Video

Captainclock · #31 03-23-2016, 08:19 PM

Thanks, The .39 and .039 MFD capacitors I did replace with .33 and .033 MFD capacitors and the .056 MFD Capacitor was replaced with a .047 MFD capacitor because I couldn't find anything that came close enough in value (seeing as those values are from the old value system) Also I did accidentally get the yoke put on wrong so that the picture was off kilter slightly (the picture looked like a diamond instead of a rectangle) so I fixed that. As I said before I did try to take the shield of the back of the circuit board but my soldering iron wasn't getting hot enough to melt the solder blobs holding the shield to the board, most of the capacitors on the board I was able to fudge with slightly because I just moved the top cover of the shielding back slightly just enough to get my soldering iron into the back and removed the majority of the capacitors out that way without having to completely remove the shielding, although in the process of removing some of the capacitors I did accidentally lift some traces but I was able to bridge them using some wire (like I've seen done on here before by others.)

UPDATE: Figured out the that the height adjustment was off so readjusted that and now I have a full screen again. Now I have another issue though and its with the tuner, it seems that anything with an RF Output that I hookup to the TV using Channel 3 or 4 the station using channel 3 shows up on channel 2 and three and when using channel 4 it shows up on channel 3 and channel 4 and for some reason or another I can't seem to get the channel to lock in properly when fine tuning it and it makes lots of buzzing noises in certain screen lighting conditions. I was thinking that maybe I need to replace the tubes in the tuner but I'm not sure, any ideas as to what could be causing my tuner issues?

maxhifi · #32 03-25-2016, 10:02 AM

Just FYI, 0.39 and 0.56 are still currently made values, I would suggest not substituting values of caps in TVs because some of them are quite critical.

dieseljeep · #33 03-25-2016, 11:21 AM

Quote:

Originally Posted by maxhifi

Just FYI, 0.39 and 0.56 are still currently made values, I would suggest not substituting values of caps in TVs because some of them are quite critical.

RCA, always seemed to be into those odd-value caps.
When I first started repairing, the parts houses didn't seem to carry those values.
The RCA distributor was miles from my place. Half the time, they didn't even stock them!

maxhifi · #34 03-25-2016, 11:41 AM

Yeah when I needed a 0.056 I just paralleled a 0.047 with a 0.01... That's well within the +-10% spec

Captainclock · #35 03-26-2016, 07:54 PM

Quote:

Originally Posted by maxhifi

Just FYI, 0.39 and 0.56 are still currently made values, I would suggest not substituting values of caps in TVs because some of them are quite critical.

If that's the case then how's come none of the parts suppliers that I usually go to (like AES or Parts Express or some of those other places that carry capacitors) don't carry those values? I've even looked at places like Mouser and Digikey and they didn't even carry those values, anything beyond the standard values are considered a special order item with them which can take weeks or months to get in depending on the backlog.

Captainclock · #36 03-26-2016, 07:59 PM

Quote:

Originally Posted by dieseljeep

RCA, always seemed to be into those odd-value caps.
When I first started repairing, the parts houses didn't seem to carry those values.
The RCA distributor was miles from my place. Half the time, they didn't even stock them!

Not just RCA but GE as well because I know that my GE 9T001 Television had 1 .0039 MFD capacitor in it and I had subbed it out for a .0047 MFD capacitor (which thinking upon it now probably a .0033 MFD probably would of been a little closer to the original value than the .0047 would of been.)
Anyways what is up with these oddball capacitor values in these vintage TVs? Why couldn't of they just used standard values for everything instead of using all standard values except for a couple?

fixmeplease · #37 03-26-2016, 08:35 PM

Possibly the engineers of your TV were fussy and wanted the perfect size no matter the oddity???

When I recently recapped my RCA, I think Just Radios had many of the caps, Capacitor world some of the others, and 1 high volt cap I got off ebay. There was an odd 5% cap that cost a buck, but JR had it. Ive slowly been building up my inventory, and always buy an extra of each size I order as I'm sure I'll need another sometime. It does save special orders. Its the initial buying that costs money. Good luck!