got another color roundie today g e

[Sandy G]

Good Ol' Unca Art...Yer FAVORITE relative who comes for a "Visit"...And then NEVER feckin' LEAVES....(grimace)

[wkand]

I have a question and a comment:

Q - What year is that GE set from? CTC15's are 1966 or 1967, right?

Comment - Thw wax dripping from the fly may be indicative of not replacing Horiz out, HV Reg and HV Rect tubes at time of CRT replacemnet. I was told by an old TV guy in the '70's that it's a good idea to replace all 3 as a set with a CRT rebuild or new replacement.

Q - Do others in the forum have opinions on that?

Q - Would it make sense for snelson to replace them now if the fly is still good?

OK that's three questions....

[marty59]

I've came across many times when a crt had been replaced that the flyback would then bite the dust..coincidence?? I'd look at that as an extra measure of preventative maintainance from a service shop point of view.

After they spent all that money on a picture tube job the last thing you would want is an angry customer!

I'd make sure the sweep tubes would test good, even if they had been replaced at some point....after all part of refurbishing a set is checking the tubes anyways.

The CTC-15 type sets came out around 1964 before the mandatory UHF rrequirement.

[snelson903]

oh yes its going to get a shake down ,im even going to remove the pva material that crt is starting to get racks on the endge ,when i take it apart i dont want go back in it for a long time . im going to replace the small caps the lytics anything that might show up .when i test tubes even if there slight weak i replace them ,i have a very good supply of new and used tubes ,iv been collecting tubes of all kinds since i was a kid. thats why im still rebuilding that zenith from the barn keep finding things ,i dont want to start on nothing else till that one is complete finished. plus iv got to get things around here ready for winter and im expanding my tv work rooms[ remodeling].

[wkand]

Thanks, guys! You confirmed what I was thinking about fly issues after CRT replacement.

Best to you snelson! That barn find Zenith is an amazing project you've got going! I don't blame you for wanting to finish that first.

[ctc17]

Its more likely the fly would fail due to a weak crt..heres why.

Bad crt = low load on HV, HV regulator tube takes up the slack until it gets weak then the hv goes high and the isolation in the flyback doughnut breaks down and arcs.

Almost all the CTC flyback failures I have seen were due to arcing from the top of the doughnut to the bottom. The high voltage was too high.

[snelson903]

while we are on that subject i would like to find a new flyback still in the box ,or if there was any new one's that was part of any update they might of had .i have three used one's but rather have a new one, id like to watch this tv on a regular basis.

[DaveWM]

keep the set in a air conditioned eviroment (low humidity), make sure the HV is properly set, both the anode voltage and the eff coil for min current. Make sure the regulation is working properly, use a variac or a bucking transformer and see how low you can go and still get normal operation. I generally use 105-110vac which seems to work fine. If you do all of the above I doubt the fly will be a problem.