[sdiy] Hammond Scanner Vibrato question

[jhaible at debitel.net]

Hi,

I think about (finally) making a Hammond Scanner Vibrato emulator.

I've just ordered a bunch of inexpensive inductors - I will measure
them and see if I can compensate the losses well enough. (The original
also had different voltage dividers at the indiviual taps, so I guess
there was some compensation for inductor loss as well.)

If the cheap inductors won't work, I'm going for a FDNR structure.

I have two questions:

(1) How much "overlap" is there in the Scanner for the rotor from one
    stator packet to the next?
    The stator has 16 sections, that's 22.5 degrees. Surely each sator
    packet is smaller than 22.5 deg (there must be some gap ...), and
    maybe the rotor packet might be exactly the size of one stator 
    packet, or larger (unlikely), or smaller (likely). Does anybody
    know the details ?

(2) There are basically two versions of the Line Box. The larger one
    has 25 inductors (without magnetic coupling); the smaller one has
    18 conductors (with coupling). I understand that the latter (smaller)
    version was built to get basically the same effect as the earlier
    version (for less cost). But how close are the two version in sound?

Thanks in advance for any helpful hints,

JH.








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