Partial Update 09/20/2009 0200 hrs.(Z)
These JPEG's are to give those who are looking to identify a certain Russco some photos to reference. This group is by no means complete; from inception to final product run many Model B.'s and Cue-Master's experienced some small changes as advancements came along. Changes were made in the platter shaft wells, motor suspension plates, placement of start "caps," as well as changes in the start cap itself.
A Little Piece of Russco History Some early models had "bathtub capacitors" mounted under-deck and wired to the Switchcraft on/off switch as "click" caps. The true reason for this: Mr. Russ Friend found them as surplus by the hundreds (if not thousands), and was able to purchase them at a very reasonable price. They worked fine, so they were used instead of the small "cap" soldered directly to the switch!
(click on JPEG below to start slide show)
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Partial Update 09/20/2009 0200 hrs.(Z)
RTC added this section due to requests from owners/re-builders and those who wish to see the basic differences between the Studio-Pro Model B. and Cue-Master shift mechanisms as well as "basic" measurements for each. Both have Oilite bearings in top and bottom of the "main" post/shaft-well, attached to main deck. They have no bearings in the idler shaft assembly "holder," as none were needed. The idler arm has very little travel from capstan to inner-rim of platter and is held there with a tension spring or kept away from platter when in the neutral position. More information/photos will be added in the near future.
(Click on JPEG below to start slide show and see a bit more info)
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Information Concerning Plateform Mounts Shown Below
Partial Update 07/31/2009 1035 hrs. (Z)
Information will be added to the below diagrams (Plateform Mounts and Snubbing Washers) "snubbers" as we update. Using a combination of the correct mount with a snubbing washer will improve the performance of the mount. The main characteristics of the "snubber" is to assist in vibration damping, therefore, less noise!
Materials : Metal parts are cold rolled steel or alodized aluminum alloy. Flexing elements are specially compounded natural rubber. Steel holders for holder-type mountings are plated. Unplated steel parts are coated with specially prepared rust preventative for protection during shipment or storage.
Reference dimensions: Tolerances: 0.xx = ± 0.03 in (± 0.762 mm) 0.xxx = ± 0.015 in (± 0.381 mm)
Mounting bolt holes are: + 0.003 in (0.076 mm) and - 0.002 in (0.050 mm)
These "sets" of Plateform mounts are only general, every turntable using these mounts may require a different load-bearing mount with different axial spring rates. In some cases two (2) different mounts per unit due to bearing load/vibration values per unit may be required.
Standard stock plateform mounts are widely used to efficiently isolate steady-state vibration and control occasional shock. When loaded to their rated capacity, a system natural frequency of approximately 18 Hz results, providing effective isolation in applications where disturbing frequencies are 40 Hz and above. Radial stiffness is approximately two to three times the axial stiffness.
More On "SNUBBERS"
Note : Snubbing washers are recommended for use with plateform mounts. Snubbers form an interlocking system of metal parts, providing a positive safety, which limits/cushions excessive movement from overload and shock.
The Snubber helps to "bleed-off" values/factors often associated with something as small as a foot-fall or rolling across a floor in your chair while spinning-up a disk. This last statement is especially true with hard-wood flooring with a "sensitive deck" standing nearby.
You can "click" on the arrow below to start the slide-show as well as "clicking" on an individual drawing/JPEG which will enlarge the main upper viewing pane.
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