Crosley bakelite tv

[Radiotronman]

I started recapping my Crosley Bakelite tv. All of the wax and electrolytics are replaced. Still having issues with the horizontal wanting to lock and adjusting the horizontal hold, horizontal range don't change it much. I guess I'll starting checking resistors in the horizontal section and see if there are any out of tolerance resistors. I checked the one Meg resistor bridged across the hirizontal drive and its within tolerance. This is as far as Ive got tonight.

[Radiotronman]

I also forgot to mention I don't have any audio yet, just a him from the speaker. Here is a picture of the set..

[Radiotronman]

I checked all of the resistors around the 6SL7 horizontal oscillator tube and didn't find any out of tolerance. I changed the 6SL7 with a new one and no change. I double checked my cap replacements to see if i made any mistakes and they're all good. More studying of the schematic....

[earlyfilm]

Originally Posted by Radiotronman

More studying of the schematic....

Can't speak for others, but I do not recognize this set.

Crosley TVs were never big sellers, although their radios were very common.

If the schematic is available on line, how about a link to it, if not, how about a scan of the horizontal section so someone who might help you could determine what circuit this set has. Just a model number could help.

A test please: By adjusting the horizontal hold, can you make the set lock in somewhere and go out of sync on both sides of where it locks in? Or does it lock in at the extreme end of its range?

James

[dieseljeep]

Originally Posted by Radiotronman

I checked all of the resistors around the 6SL7 horizontal oscillator tube and didn't find any out of tolerance. I changed the 6SL7 with a new one and no change. I double checked my cap replacements to see if i made any mistakes and they're all good. More studying of the schematic....

I looked up the set in Rider's #5, which I think is the set.
The schematic shows a 6SN7 tube as the horiz osc in a syncroguide circuit.
Make sure the .01 cap across one of the coils of the synchroguide transformer is proper.

[Radiotronman]

Sorry guys, I meant 6sn7. The model of the tv is 10-401. Below is the picture of the horizontal section of the schematic. I cannot get the horizontal to lick at all.

[Radiotronman]

It's really close, just can't get it locked yet.

[bandersen]

Have you adjusted the horizontal oscillator coil ?

[Radiotronman]

No, I guess I don't know where it is on this set.

[Radiotronman]

I tried filling with the trimmer in the horizontal oscillator transformer, but with no success.

[Kevin Kuehn]

Well it looks like your schematic is in Sams 95, folder 2? So if you look on page 10, there are specific instructions on how to adjust the horizontal oscillator. However I noticed a mistake when you get down to the second part about adjusting the horizontal waveform shape - at which point they start referring to L27 as L7. But without a scope you shouldn't even mess with that waveform adjustment.

[bandersen]

One side of the coil adjusts the shape, the other side the free running frequency, That's usually the end that is accessable from outside the chassis. Set the horizontal hold control in the center and adjust that coil until you get a lock.

[Radiotronman]

Ok, I'll try that, but how can you tell which are terminals 5-6. They're not numbered.

[old_coot88]

There's two resistors coming off either end of the horiz.hold control, R85 (68K) and R86 (150K). If either of these has drifted in value signifigantly, it can throw the H.hold out of range. Check these for correct value before messing with the coils.

[Radiotronman]

The 150K is pretty close and the 68k reads 61.5k. Would that being less cause it?