European version Philco predicta siesta

[Hugo barbedo]

Hi
good news and not so good news

the first powerup was somewhat sucessfull
the crt looks very strong, i have the brightness in the middle and contrast at 3/4.
the IF section seems to be working fine, although its strange that i have my modulator on channel 3 and can only tune it in on channel 5 on the tv...
sound is good even when there is lots of white content
the horizontal locks very well with the welding machine double diode
the vertical is not so great
i am having this foldover problem where the bottom part of the picture is missing and its appearing on the top of the raster. the raster is not centered on the screen and its not a problem of messing with the centering rings. i can fill up the screen by turning up the height control but the scanlines become huge and i loose vertical lock. also if i dont have a picture tuned in the raster fills up the screen
the video amp/sync separator tube is new and with the old one its the same
voltage checks on the vertical output/oscillator dont reveal any problem. all the voltages are preety much spot on
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on the yoke there is a black wire going to a metal wire that touches the screen aquadag...that is broken and makes the picture completely jumpy like when we loose vertical lock...bridging it with the black jumper wire seems to cure the problem but if i try to ground it to chassis the left side of the image collapses making a triangular shaped raster, very cool...i wonder if i have other broken connection or wire on the yoke causing the foldover...would it be possible? if so it would prevent me from chasing ghosts around the sync and vertical sections
there is an adjustable magnet on the left side of the yoke that has signs of abuse and the tube socket of the 6aw8a is also very abused, so it appears to me that someone ditched the tv because they could not fix this very problem...looks like i have a tough dog here, with me ususally its never the capacitors
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any ideas will be greatly appreciated


edit:
this is my scope on the pin 6 of the 6dr7
that is the plate of the vert oscillator
by looking at this i see the patient is suffering from serious heart disease...the drive is not linear, a wide pulse then a short one, then a wide one and so on, looks like it skips a beat every 2 cycles
the amplitude of the pulses looks ok , i am on 10x probe with 5v per division and the scope is not well calibrated so it seems decent to me. (maybe 120v PP)
what the hell can cause this???
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