In message <nl.wsqc.ktfq@rne.aaa.ij.jyyji>
          Peter <plp@actcom.co.il> wrote:

> If this is for modulation,

It is.

> then I suggest you implement cathode 
> modulation of the crt using a NPN transitor and AC couple it to the 
> signal, using DC recovery to clamp on the black level (or white level).

So what you're suggesting is something like this?

Cathode >---------*
                  |
                  |
         0u47   |/ C
Zmod >----||----<
                |\ E
                  |
                  |
                 ---
                 gnd 

(I specced a 0u47 'cos that's the smallest value HV capacitor I've got - all
my 0.1uFs are 63V; add resistors to taste)

The only problem I can see with that is it'll probably throw the voltage
divider chain out of whack.. time to redesign it, methinks :-/

Thanks.
-- 
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