I just Googled on this and found only one reference. My own. I'm pretty sure I didn't imagine it. It was a PBS Saturday morning show in the late 70s produced by the Baltimore (I think) station. It specialized in step-by-step DIY (unlike 'This Old House' which shows mostly how to hire contractors) projects restoring old houses. I distinctly remember one half-hour on taking apart sash windows, re-doing the weights, refurbing, and replacing. There was a 'letters' segment and I also remember one-word advice to someone who asked what authentic Colonial lighting was like. "Dim," said the host.
Is this program a figment of my imagination, or does anyone else remember it?