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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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.

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!

开云体育

Chris is right what the no-difference within the T-series is concerned. But compared to the consoles (A-100, -2 -3 organs) the delayline of the T-series organs is one LC bin shorter AFAIK.

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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.

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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Early H models had a square scanners that had more poles on the inside than the earlier consoles.
This square scanner was apparently temperamental and was later replaced by the drum scanners.
Transitional models may have the square scanner on the end of the TG that was hard to reach, so it was left in place and disconnected. A field replacement was a scanner unit that consisted of 2 drum scanners and a motor to run them. This was mounted under the TG shelf. The square scanner on the run motor side was removed, and as I said before the square scanner on the outbord side was left there and diaconnected.
Seems like the line box was different between the square and drum but my memory is fuzzy on that.
Pic is the inside of the square scanner. Looks pretty complicated and expensive to fabricate!

Thanks to all of you. It's very helpful for me :-).

Yes, I also didn't notice any significant difference between different T model organs regarding the vibrato drive and, most important, recovery circuitry. And yes, the T serries delay line is shorter compared with the ones found in big (five octave) consoles).

The scanner Bob mentioned was a 32 pole one in early H series organs. Maybe it's the Celeste scanner?

Btw, you may have been asking yourself why I'm asking such a weird question. Well, currently there's a R-100 organ offer here for next to no money. I'm tinkering with substituting my C-2's original TWG with that one that has real sinusoidal tones at #1 to #12 and rewire the manuals to have real 16' tones at the lowest octaves. I'd need to add either the drum scanner or the pan scanner fo one of my T's to that generator to keep the vibrato/chorus...

Best regards!