Video 8 head disc, 3 heads but 4 coils marked A and B on opposite sides of drum head FE ,and combined head JOG on same mount as B no pic found on gogle pics Trying to determine what a doubled-up head loks like , as before demounting the drum I thought it was 3 coils , with one of them the ferrite gap section broken away , but now inside looks like 2 purpose made separated ferrite end forms, ie not fractured. On Sony EV S700 , from SM, FE is probably Flying Erase. I may attempt a pic of what is here

a close-up pic of Sony EV S700 , video 8 JOG, doubled up head ignore the well in the aluminium, dark enamelled coil on left, clear enamel on right and two dark glass/ceramic linear features with a large gap, compared to normal gap, as designed or part broken away? As rounded edges, I would say as designed

Doubled up video head appearence?

N_Cook 12 years ago

I've never, in earnest , removed an individual head and fixed it to another drum. If enough of the ferrite was remaining on the original I would clamp the drum to a stout plate and manouevre a vinyl record stylus tip adjascent to the gap in the ferrite and fix in place and another such stylus on the other side, before undoing the screw holding the brass in place. Then gently move the replacement head into position and somehow clamp the brass to the drum before tightening the screw

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N_Cook 12 years ago

my repair did not work , so whatever turns up on ebay as "needs repair" or even working order

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Jeroni Paul 12 years ago

d B heads, I had two identical upper cylinders, natually one with a bad "A head" and the other with the "B head" broken and tried a transplant between the two. Even having access to a brand new 3rd one and making multiple mea surments of every x-y-z measurement I could make, it never worked.

I remember when I did this experiment I noticed both drums had a yellow hea d and a green head, the color surrounding the soldering pads. At first I th ought that color identified the odd/even field head but to my surprise it d id not, so after the transplant I ended with a working drum with two yellow heads.

I found that the second time I did the transplant because just like the fir st I did I was expecting it to work but it did not. While I was checking th e ferrite with a magnifier I noticed the gap inclination of the head I inst alled was the same as the head already in the drum. The color in the head p ads mislead me to take the wrong head from the donor drum.

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N_Cook 12 years ago

Anyone know where to find the dimensional specs/standards of helical scan systems (before wear anyway) particularly diameter between head face surfaces and angular offsets , particularly for DAT and video8 systems?

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N_Cook 12 years ago

By not work, pre-recorded Bond movie on a DAT tape plays a useable B&W image but absolutely no sound . In 6 chanel PCM audio mode no sound on any of the 6 chanels of a tape with n6ch audio recorded to it

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