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Assuming you get it restored, you could modify a TV modulator to output on channel 1. You want the modulators that use a 4 legged metal module used to create channel 3 or 4. Remove it, and install a 15MHz crystal in its place, so it straddles the modules old ground connection. And you may need to add 4pF caps, one cap for each crystal lead, to get it to oscillate. This in addition to existing caps, so the total would be about 8pF. Seems that lower frequency xtals need bigger loading caps. Likely to yield a similar reactance at the new freq like that with the old cap at the old freq. Those of you who have experience in xtal osc circuits would recognize this, probably better than I would.
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