Homebrew Drum Computer

[Tony Duell]

> 
> 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