Ethan,
I have some bulbs left over from my days at Burroughs that fit that
general description. Can you measure the current on one of your's? Also can
you post a pictue so that we know exactly what you're looking for?
Joe
At 05:53 AM 1/28/02 -0800, you wrote:
>
>I'm restoring some pre-TTL DEC stuff (R and W series logic) and I need
>a handful of front panel bulbs. Unlike the later bulbs with a plastic
>base and strong wires to solder to the PCB or to plug into socket pins,
>these are like a kernel of corn, with two fine wires coming out of the
>glass envelope at a slight angle with no supports of any kind.
>
>Some of the bulbs have burned-out filiaments. Many of the ones I need
>to replace have broken wires externally. I am going to attempt to
>solder new wires to the stub, but I don't expect the attempt to be an
>overwhelming success. I might try a harder solder so that when I put
>them back in the frontpanel PCB, they won't give way when I put enough
>heat on the other end to install them.
>
>About all I know about these bulbs is that they are fed a nominal 12VDC
>from the W-series driver boards. The front panel itself is literally just
>a PCB and a bunch of bulbs; no active circuits (unlike, say, the front
>panel of a PDP-8/L). Testing should be easy - feed 12VDC at a few mA
>to each set of fingers and check the bulbs, one by one.
>
>If DEC was underfeeding these bulbs to extend their life, I would expect
>that the bulb should be rated at 14V-16V. I measured slightly over 12VDC
>in circuit, but well within a 5% tolerance.
>
>I have checked the online manuals I could find, but no mention is made
>of the nature of the bulbs for 1966/1967-era DEC equipment. Any ideas?
>
>-ethan
>
>
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Received on Mon Jan 28 2002 - 12:47:37 GMT