HP-2116 front panel lamps

[David Collins]

Christian, when I was restoring the HP Computer Museum's 2116A I ordered a
bunch of these 345 bulbs from 1000bulbs.com - but it seems they no longer
stock them. 

I did find this listing though which looks current...
https://www.lighting-pros.com/eiko-345-t-1-3-4-midget-flanged-sx6s-case-of-1
0

They are around 0.04A current draw - not 0.75A!

Hope that helps,

David Collins
www.hpmuseum.net



-----Original Message-----
From: cctalk <cctalk-bounces at classiccmp.org> On Behalf Of Christian Corti
via cctalk
Sent: Wednesday, 25 July 2018 6:41 PM
To: cctalk at classiccmp.org
Subject: HP-2116 front panel lamps

Hi,

I need to replace several broken lamps from our HP-2116B front panel. The
old/original ones are CM-345 or OL-345. This makes sense, they are rated 6V
40mA 10000 hours.

BUT:
The maintenance manual says something different and is even wrong and
inconsistent.
HP part number is 2140-0035, description "Lamp, Incadescent, 6.3V, 0.75A"
This can't be true. 92*0.75A would be 400W alone for the front panel
lights...
The manufacturer code is 71744 (Chicago Miniature Lamp Works), mfg part
number 1775. That is indeed a 6.3V lamp, but 0.075A (better!). Problem: 
that is a midget _screw_ base lamp, so wrong socket and only rated for
1000h. The panel and switches need a midget flanged base lamp. Who wrote
that manual? Was he drunk? ;-)


Christian