I've scanned the schematics from JRC's NRD-505 Instruction Manual and posted them on my NRD-505 fanboy site under "Links and Downloads" as a PDF download.
The Audio Archivists: "Somewhere Between Hard Science and Garage Alchemy"
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https://www.nytimes.com/2025/12/01/arts/music/iron-mountain-audio-tape-preservation.html?unlocked_article_code=1.5k8.-ksX.71L7e9Is_3LN&smid=url-share
52 minutes ago






(From 1978 WRTH)