SilverWook said:

Hey FanFiltration, Sony had a line of external Dolby Digital surround processors in the early days of DVD that had an unadvertised extra feature, an AC3 RF demodulator built in. Might these be in your price range?

http://cgi.ebay.com/SONY-SDP-EP9ES-ES-SURROUND-PROCESSOR-PREAMP-NICE-/350393597777?pt=LH_DefaultDomain_0&hash=item519515ff51

http://cgi.ebay.com/SONY-SDP-E800-Dig-Surround-Processor-EXC-Fr-Shipping-/130428969359?pt=LH_DefaultDomain_0&hash=item1e5e2c218f

Thanks so much for this info. I was lucky to be able to get my hands on an RF Demodulator this weekend. It will be put to good use on this and a few other projects I want to do in the next few months.

UPDATE: All of my future James Bond Laserdisc preservations will now feature lossless DTS Digital Surround (if film had an available surround ac3 track on the laser), and / or a PCM audio track.