On Wed, 12 Jan 2011 14:14:25 -0500, "Michael A. Terrell"
wrote:


"Dave Plowman (News)" wrote:

I wonder just how available were the delay lines needed when NTSC was
introduced? They were quite an expensive component years later.


NTSC delay lines for TV sets were about $3 for replacments in the mid
'60s. I only saw one open delay line and one with physical damage in
40+ years. The open delay line removed the luminanve signal, leaving
only moving colored splotches on a black screen.


Delay line failure was fairly common on certain tube sets in the early
70s. Both the coil opening and, in other cases, the capacitor to
ground opening. Chuck