PatW
Member
The foldover could be caused by ringing, changing the damping resistor on the horizontal yoke circuit might help ?
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The foldover could be caused by ringing, changing the damping resistor on the horizontal yoke circuit might help ?
True, it is a different yoke - but you're not measuring inductance, so you don't know if it's identical to your other yokes or not. With varying inductances and parasitic capacitances you potentially need a different damping resistor.
Since you're probably trying for identical inductance, you might want to get a cheap inductance meter. I use this one, it was only $50 https://www.amazon.com/gp/product/B00GYT5WL8/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
Take everything I say with a grain of salt, too, I read a lot but haven't done a rewind yet myself so I'm probably full of crap...
I took the two 19" small ferrite yokes they ohm twice what I want for the horizontal ferrite and the original hand wind with mag 22 wire is too big, ohms are way to low. 1 to 2ohms I need more like 5 ohms when done. reading one ferrite with 22 mag 57mm wire is about .5 to .6 ohms so when in parallel is more like 1 to 2 ohms way too low.
Planning to try and wind my own 19" Amplifone but was a bit confused by the bit you have written above. I have number of donor tv tubes and understand it would be best to pick one with something close to the correct readings on the horizontal. I plan to go through them all and get the readings, can you please tell me what I should be looking for?
Thanks
At this current point anyone trying to wind a 19" yoke would best pull up on old yoke winding thread and follow those directions. I am a tying other things on this particular thread. Otherwise follow along and wait for the results like the rest of us including Me.
The best results I can think of currently were 22mag wire .57mm or so and like 74 winds straight across spilt in half. thats 36 or 37 winds with a 1 1/2 wind crossover and then 36 or 37 winds laying in-between the first row as best as possible. I also think that Large Neck tube CRT are best at this point and possibly just using a 25" tv yoke wound on the 19" tube. Also this can't be confirmed just yet by me, I think that positive results have been achieved by others doing good work on this particular subject. As that is where my information started, with the work of others. And I thank them again. You Know Who You Are.
That's looking very nice. And in fact, the same CR31 tube I have sitting in the storage room.
Watching your progress very closely now ...![]()
the original Amplifone tubes are MED resolution tubes.
I wonder who was the first to make this claim, probably Jesus Christ in person as everyone took it as gospel. It's an M tube, which is a tube for professional monitor and doesn't mean medium resolution or else the tubes in PC monitors (all M type) would also be med res when they're actually for hi res. It's just a tube with finer pitch and dotted shadow mask instead of a slotted one found in A tubes.