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I once possessed and evaluated a professional version of the Philco scratch eliminator: factory rack mounted. With its winking eye green tube pacing the contents passing through, it provided a delightful visual spectacle, especially in a darkened room. Notwithsanding Ken Carpenter's superbly performed sales pitches on Bing's Philco shows, it was an acoustic horror. Bandwidth changes called attention to the noise instead of giving a listener's ears and brain the chance to adapt to it. There was another version: designed to interface with a complete Philco (presumably high end) system. In addition to the audio in & out, it accessed its power from the system. I think that the interface was via a round octal socket. I had one, but am not sure that I'm conjuring up the right image in 'my mind's eye'. It had a second cable that connected the filter's chassis to a small & attractive control panel that would've been mounted in, on or near the system's cabinet. As with the "pro version" I had no schematics. I presume that Philco buffs would have them. Having no Philco (or any other old set) with which to test it, I avoided the temptation to try to see if it was operational. I'd offered it on eBay perhaps 2 years ago (for a give away I-don't-want-to-discard-it price & there were no takers. I'm not being coy: I don't recall if I saved or tossed it. If anyone's interested in it, then contact me directly & I'll check "the pile". Best, Art (Shiffy) Shifrin