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What chassis model of set is this?
The really old ones like before ctc-11 did not have a service switch.
The early-mid 60's sets like from ctc-11-16?? had a 2 position slide switch, one for normal and one to collapse the picture to a horizontal line for setting screen controls.
The later 60's sets have a pull out type switch with 3 positions usually...
normal, raster (blank raster for setting purity) and service (horiz. line)
The service switch is always in the vertical circuit and sometimes in the video circuit.
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