Maggie roundie combo

[DaveWM]

I will flag the alignment tool and give that a try if the before mentioned delay line parts make no change.

I have a 1076 that I could also use by injecting at the video out and work back, just have not bothered to get it out.

[earlyfilm]

Originally Posted by DaveWM

I have a 1076 that I could also use by injecting at the video out and work back, just have not bothered to get it out.

Dave, I had assumed that you were injecting video.

Two simple checks that you might do prior to twisting coils:

Back in the pre-Cable era, before grounded feed lines, the tuner balun coils often failed. You might verify the continuity of them. An open antenna-side coil will often work quite well, but it may produce a ghost.

Also, I presume that this set has an FM radio. Many console FM radios offered the option of an internal antenna for local reception, plus a jumper to connect to the VHF TV antenna for fringe reception. I've seen set owners forget to disable the internal FM antenna when using an external antenna and this can also create a single negative picture ghost.

Jas.

[old_tv_nut]

A ghost that is that clearly defined, it seems to me, must be delay line related. Rather than the line itself, I would check the resistors and any fixed coils associated with the delay line, especially on the output end.

Edit - also check grounds in the video section

[DaveWM]

roger that, will check out around the output of the delay line.

[DaveWM]

there is a 1800 ohm 5% right after the delay line (back thru a coil then the plate circuit B+ of the 2nd video amp. there is also a 2200ohm resistor across a peaking coil after the coupling cap from the delay line that goes to the grid of the video out, will check that one as well (prob did not check before since it was in P with the coil so will have to take out of circuit to check, same with the 1800 ohm (will have to take out of circuit, will prob just replace both).

Question, do those need to be carbon comp resistors? or will metal film be ok?

(the post delay line and the one across the peaking coil).

[old_tv_nut]

Originally Posted by DaveWM

there is a 1800 ohm 5% right after the delay line (back thru a coil then the plate circuit B+ of the 2nd video amp. there is also a 2200ohm resistor across a peaking coil after the coupling cap from the delay line that goes to the grid of the video out, will check that one as well (prob did not check before since it was in P with the coil so will have to take out of circuit to check, same with the 1800 ohm (will have to take out of circuit, will prob just replace both).

Question, do those need to be carbon comp resistors? or will metal film be ok?

(the post delay line and the one across the peaking coil).

Metal film will do just fine

[old_tv_nut]

Sorry the resistor didn't cure the ghost.

Dimming and vertical shaking -- could it be AGC instead of HV?

[DaveWM]

no this is somethingn very odd going on, I just timed it, every 20 seconds I get a vert shake that last about 3 seconds, its like clockwork.

I have had odd bends (hulas I call them) that seem to be a beat freq of the vert rate vs the line rate, slow moving weaves.

argh...

when I had the hula it was a bad ground on the defection board of a mid 60's B&W maggie.

yep still doing it, every 20 seconds it gets the shakes for about 3 seconds.

[old_tv_nut]

Yes, this sounds like 60 cycle hum getting in somewhere and rolling through due to the 59.94 Hz vertical of NTSC. Need to check grounds, but also power supply hum.

[DaveWM]

this is getting strange, I scope the 405v B+ get the normal amount of ripple then bang 3 seconds of wild fluctions. take out the 3rd IF (no sync) same deal. then I scope the power line (thru an isolation transformer), sure enough garbage on the line now time to go try another set in another room, yep, same deal (this is another CTC-16) ok looks like something somewhere is messing with my power line. I am near a few real hogs (universal studios).

I think I will stop now and try again tomorrow.

[DaveWM]

I plugged in my line meter, yup, like clock work, I even notice my shop light dimming. I checked to see if there was a piece of equipment (pool pump, AC compressor) that maybe was thermal cycling, but all seems ok. going to try a few differnt outlets. not seeing anything on the modern sets, but I would assume they have better power regulation.

[DaveWM]

hmm had a lighting storm around the time this started, could the power compay be having a issue? maybe something cycling do to a lighning strike?

[ctc17]

I wonder if this is the line frequency change thing that was going to screw the clocks up. Very doubtful, just a thought.
Scope the line and see whats going on there.

[DaveWM]

Wow how wierd is this, freaky computer printer. unplugged it an all is good.

it was on the same circuit as the tv. so now I am back to the ghost again.

funny thing, while looking for a source of AC hum, I did a check of all the tubes for HK shorts, one of the 3 6GH8's (big suprise there) and a 6UA6 (sound board) had shorts. Did not seem to matter. Of course maybe the short just as not that bad.

[old_tv_nut]

Originally Posted by DaveWM

Wow how wierd is this, freaky computer printer. unplugged it an all is good.

I have seen laser printers pull down the line when printing, enough to make fluorescent lights flicker, but I assume you weren't printing anything at the time.