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VCR Gymnast VCR Gymnast is offline
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Default VCR won't record or playback color

A portable Beta VCR from 1985 works perfectly except there is no color:

1. Pre-recorded color tapes play back in B&W
2. Tapes recorded on this VCR play back in B&W on this VCR
3. Tapes recorded on this VCR play back in B&W on other known good VCRs

Therefore, the VCR can neither record nor playback color signals. What
is the most likely cause?

Is it the 3.58 MHz oscillator, the comb filter, the color killer, or
lack of a color burst? Or, is it just a defective transistor or IC that
contains an internal B&W/color switch?

Thanks