Re: Weird distorted shapes

Make sure he used noninductive current sense resistors (in yoke return
lines). A regular wirewound resistor will cause the amplifiers to
oscillate.
On Mar 3, 2014 1:20 PM, "Joel Griffin Dodd" <griffindodd@gmail.com> wrote:

> Hi all,
>
> Doug and I have been working on building a reproduction 25" Amplifone
> using a new deflection board design from an Australian designer (Dez).
> Overall it's working extremely well, but we are seeing some odd distortion
> in shapes. It's most apparent in circles, but can been seen in most shapes
> on the screen where letters look a little warped and joins between vectors
> overlap.
>
> I know even 6100 deflection boards do have a little of this, but it seems
> to be more apparent on our board.
>
> Here's an extreme example of the death star on the star wars start game
> menu...
>
> https://www.dropbox.com/s/i1r76l4dif9vv2w/2014-03-02%2020.10.19.jpg
>
> Doug mentioned that he thought it may be down to the tolerances of some of
> the new components we are using on the deflection board. I wanted to throw
> it out to the group to see if anyone has any ideas of where we might look
> in the circuit to investigate this odd issue.
>
> Joel
>

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Received on Mon Mar 3 18:53:59 2014