The MW6-2

[ppppenguin]

You can measure the current required for full deflection, also the line coil inductance. This will give you the basic parameters for the timebase. Let's take a simple example. Say the coils are 0.5mH and 0.5A is needed to deflect the beam from centre to edge. If you need to do this in 32us then you need 0.5mH * 0.5A/32us = 7.8V. This is simply from the relationship:

V = L * (dI/dt)

Since I is meant to be a linear ramp, we don't need to worry about the calculus.

At the end of the stroke we have 0.5 * L * I^2 energy stored in the coil. 62.5uJ in this example. For flyback this will be transferred to a capacitor in (for this example) 12us. The peak flyback voltage can be calculated either by working out the value of C and using 0.5 * C * V^2 or more simply by multiplying the forward voltage by 32/6 (half the flyback period, to correspond with half the forward stroke). Hence 7.8*32/6 = 42V.

Not sure what EHT you're running at or if you plan to increase it, but remember that the deflection current is proportional to the square root of the EHT voltage. This is one important reason why TV tubes have almost all used magnetic deflection. With electrostatic deflection the scan voltage is proportional to EHT. For 'scope tubes with narrow deflection angles the deflection sensitivity problem was solved by post defeletion acceleration.