10 Nov
2007
10 Nov
'07
6:26 p.m.
On 10 Nov 2007 at 20:56, William Donzelli wrote:
It should be noted that BED resistors were almost
never used by the US
military. The exception was during a few years in the 1930s, and only
in a few pieces of equipment. By 1940, the US military had gone
completely with the stripe system.
It's entirely possible that I recall a piece of commercial gear, not
military. But they were frustrating to read when soldered in.
unsuccessful. The best scheme when dealing with these
is to look for
the two dots that make sense as the value, and see if the next, often
around the corner, is a valid multiplier color.
I'll still take those over caps whose value is given by little glued-
on bits of paper. I've got some GTE gear that's built like that.
Curiously, the postage-stamp (Sangamo) micas don't have the color
dots filled in, but rather have the value printed on the reverse
side.
While not a common occurence, I have seen the color
coded "postage
stamp" caps on IBM SMS cards from the 1960 era.
I've got a couple on some MPI floppy drives were I needed to adjust
the LP filtering on. I had some mica caps scavenged from some 60's
vacuum-tube computer gear that I pressed into use. They're still in
the circuit and working just fine.
Cheers,
Chuck