Only T- series organs were produced with both types of scanner as
far as I know. Some later models were only made with drum scanners
(H-series?). Electrically, the capacitance between stator and
rotor in the scanner would act as a high pass/low stop filter in
conjunction with the input impedance of the vibrato recovery amp.
As long as the capacitance is large enough to allow the lowest
frequencies required to pass, the exact value wouldn't be
critical. Most, if not all, all the organs that were equipped with
drum scanners didn't put vibrato on bass pedal signals, so the
very lowest notes in the organ didn't go through the vibrato
scanner anyway.
On 30/07/2023 12:02, Chris Clifton via
groups.io wrote:
To the best of my knowledge, their are no differences in the
vibrato drive, vibrato line, or vibrato recovery circuits used
in organs with either type of scanner. The schematics for early
T-series organs and later organs including the T-500 show no
differences. I think that it's safe to assume that either
scanner type is electrically equivalent to the other.
Mechanically, of course they are very different.
On 30/07/2023 10:46, Uwe Menrath
wrote:
Hi,
I've seen different types of vibrato scanners in otherwise
similar organs: My TTR-100 has a self starting motor, it's
scanner is of the same pan type as in consoles from B-2, C-2
etc. on, but mounted at the opposite generator end (where the
big consoles would have their start motor). My TTR-200 and T-200
have basically the same generator, but with a drum scanner
mounted next to the self starting motor. As the delay lines in
these organs appear to be the same, I think both scanner types
show indentical capacitance values between the rotor and the
stator plates. Am I correct?
Best regards!
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