Re: [ARSCLIST] Repairing (or purchasing) a Uher

["Richard L. Hess" <arclists@xxxxxxxxxxxxxxx>]

At 03:48 PM 6/14/2006, Scott Phillips wrote:
> I'm not completely positive, but I don't think you'll ever get the APR's
> to run much slower than you have. They have brushed capstan motors, and
> they will tend to 'cog' at slow speeds because of it. Might I suggest
> trying having the shaft on an APR capstan motor ground down to a smaller
> diameter so the motor RPM stays higher...just a thought. AMP services
> might be able to do it, among others....

Thank you, Scott,

I agree...I don't think I'll have anyone touch the capstan shaft on 
the APR-16 <smile>...but getting an APR-5000 motor turned down would 
be do-able.

I need to check as the capstans on the 3202 and 3402 are also turned 
down, and perhaps a 3202 capstan motor could be used on a 5000.

Since the A807 is also a DC servo motor, I wonder how it would run at 
15/16 and 15/32.

Does anyone who has a slow speed Revox happen to know what the 
capstan diameter is? I'm wondering if that is turned down from the 
standard 3.75/7.5 A77 capstan. If it isn't that would bode well for 
the A77/B77 and A810 to be running at slower speeds. All these use 
the Studer AC servo motor. I wonder what its real lower limit is.

I really get frustrated maintaining machines that are used 1-2 times 
per year. It's a lose-lose situation. That's why I try modifying my 
main machines to handle the outliers.

The modified A810 would conceivable have a divide-by-8 switch so 3.75 
would become 15/32, 7.5 would be 15/16 and 15 would be 1-7/8. That 
would be very interesting. EQ can be best handled post in the PC, I think.

Cheers,

Richard


Richard L. Hess                   email: richard@xxxxxxxxxxxxxxx
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