CITY THEATRICAL 1501 Follow Spot Yoke User Manual
- June 4, 2024
- City Theatrical
Table of Contents
CITY THEATRICAL 1501 Follow Spot Yoke
Getting Started
Congratulations on the purchase of your City Theatrical Follow Spot Yoke. The
City Theatrical Follow Spot Yoke is a professional quality device that can
provide smooth pan and tilt operation to your lighting fixture. A heavy steel
yoke gives mass and prevents vibration, and ball bearings on the pan and tilt
create extremely smooth movement, even on very long throws.
The City Theatrical Follow Spot Yoke can be configured for use with the Source
Four™ 19º-50º, 10º, and 5º. A track allows the lighting fixture and any
accessories to be balanced for ease of operation.
Preparing Your Lighting Fixture
- If you are planning to use a 19º-50º or a 10º Source Four, you will need to remove the shutters from the lighting fixture. This is not necessary, but may be desirable for a 5º Source Four to prevent the shutter blades from accidentally being moved during operation. Remove the shutters by removing the four machine screws which hold the two halves of the Source Four barrel together and exposing the shutter, pressure plate, and shutter spring parts. Remove the shutter blades, but reinstall the pressure plates and springs. Do not reinstall the existing four machine screws into the barrel. Go on the next step:
- Two Angle Brackets allow your Source Four to be installed in the Follow Spot Yoke. Replace the four ETC machine screws with the enclosed #8-32 x 1 ½” pan head Philips machine screws into the Source Four’s existing #8-32 hex nuts.
- Next, install the two Tee Slot Extrusions using the enclosed #8-32 x 3/8” flat head Philips machine screws (three screws per extrusion). For 19º-50º or 10º Source Four, install the Tee Slot Extrusions with the excess track overhanging toward the rear of the lighting fixture. For the 5º Source Four, the Tee Slot Extrusions overhang the Angle Brackets toward the front of the lighting fixture. See diagrams below.
Installing the Source
Note the two Tee Blocks that slide into the Tee Slot Extrusion. Using a
3/16” Allen key, slightly loosen the two 3/8” x ½” socket head shoulder screws
to free the Tee Blocks. Carefully insert the Tee Slot Extrusions onto the Tee
Blocks. Tighten the tilt handwheel. Temporarily tighten the shoulder screws.
Install four 4-40 x ¼” pan head machine screws, one in each end of each Tee
Slot Extrusion. These screws serve as safety devices to prevent the Tee Blocks
from accidentally slipping out of the Tee Slot Extrusion track.
Install the Lens Tube into the Source Four
Install the Lens Tube into the Source Four and install the two #10-32 screws
(one plastic thumbscrew and one Philips machine screw) that hold the Lens Tube
to the lighting fixture. Plug in the lighting fixture into a switch or dimmer
and dress the cable to ensure that it does not restrict the yoke’s movement or
its balance. Turn on the lighting fixture and adjust the sharpness of the beam
to the degree that you think is appropriate.
Balance the Lighting Fixture in the Yoke
The lighting fixture can be adjusted forward or backward in the Tee Slot
Extrusion to establish a perfect balance point. To test the balance, carefully
loosen the tilt locking knob and feel if the fixture is front heavy or back
heavy. To adjust the balance, loosen the two shoulder screws and evenly push
the fixture forward or backward in the Tee Slot Extrusion until it balances
exactly. Lock the shoulder screws again. Test and repeat if necessary.
Using Other City Theatrical Accessories with w Spot Yoke
City Theatrical has created a range of accessories to make your Follow Spot
more versatile and easier to operate.
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