14 Dec
2007
14 Dec
'07
6:53 p.m.
I thought of this, too. So far I haven't found an online source of
them (Google search terms: "glass delay line" OR "quartz delay line"
OR "ultrasonic delay line" TV PAL OR NTSC).
-Bobby
Fri Dec 14 19:10 Tony Duell wrote:
I wonder if you could use those glass delay lines that
were used in
PAL
colour TV receiver until fairly recently (and there must be plenty
still
around)? Alas they have a somewhat odd delay time (a little less than
64us -- one line period of the European TV signal), but I am sure you
15 Dec
15 Dec
3:29 p.m.
I thought of this, too. So far I haven't found an online source of
them (Google search terms: "glass delay line" OR "quartz delay line"
OR "ultrasonic delay line" TV PAL OR NTSC).
I didn't think the NTSC system used a delay line at the receiver, but I
must admit I've never repaired a US TV set.
It's not a common component for spares companies to stock, simply because
it rarely fails. And of course more modern TVs used IC delay lines, which
are not what we want here.
When I wanted one, I went to an (alas long-gone) TV repair shop that also
sold compoennts. No, they didn't keep them in stock, but the owner found
a scrap PCB with a delay line on it. Needless to say that was acceptable.
-tony
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ard＠p850ug1.demon.co.uk -
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