29 Nov
2009
29 Nov
'09
5:50 p.m.
Dave McGuire wrote:
On Nov 29, 2009, at 7:31 PM, Brent Hilpert wrote:> >>>
(Minor correction to my own msg: "1842" instead of "842".
Probably the IBM part number.)
Are they so unique to id them as MV2s?, I think HP was using a
similar package.
I have a handful of MV2s from my childhood days. I've never seen
another LED quite like them. There wasn't a whole lot of package
standardization (some, but not much) for LEDs in those days.
This page suggests they were from HP, the 1842 part of the number matches.
http://www.decadecounter.com/vta/tubepage.php?item=39&user=0
http://www.decadecounter.com/vta/articleview.php?item=525
The top contact on the ones I have is the star as shown there, rather than the
simple circle of the MV2.
Something similar also shows up in the 1976 HP Optoelectronics databook.
The MV2 is further down the page; looks the MV2 is more significant
historically.
Also for the MV2: http://ledmuseum.home.att.net/1960.htm
Stamped around the base is
"842","M" & "701".
Monsanto MV2s. Beautiful devices.