Re: HP-2116 front panel lamps
It might be worth saving the bases and buying "grain of wheat" lamps to rebuild the lights. I see ~70ma 6v lamps available. That sounds similar to the original specification. Dwight From: cctalk on behalf of Brent Hilpert via cctalk Sent: Wednesday, July 25, 2018 8:21:58 AM To: General Discussion: On-Topic and Off-Topic Posts Subject: Re: HP-2116 front panel lamps On 2018-Jul-25, at 6:47 AM, Christian Corti via cctalk wrote: > On Wed, 25 Jul 2018, it was written >> 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! > > Yes, the Installation and Maintenance Manual on bitsavers > (02116-9153_2116B_Vol2_Oct70.pdf) contains several errors. > Interesting enough, my printed copy of this manual from 1968 (that is > completely different from the 1970 one; it only has parts lists and > schematics, the chapters for installation and maintenance are simply not > there) is right: 2140-0035 6.3V 0.04A > > In the meantime I've ordered a bunch of JKL 345 from Mouser (60 Ecent/piece) To mention, they are actually run below-spec in the processor, which of course improves longevity and reduces the heat next to the plastic front panel. >From actual measurements in my 2116C the lamps (CM345) draw: register-bit positions: ~ 31ma @ 4.1V inside the push-buttons: ~ 36mA @ 5.4V compared to the spec: 40mA @ 6V ( I obtained CM345s from Mouser in 2013. "95 in stock", that would have left 83 after my purchase).
Re: HP-2116 front panel lamps
On 2018-Jul-25, at 6:47 AM, Christian Corti via cctalk wrote: > On Wed, 25 Jul 2018, it was written >> 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! > > Yes, the Installation and Maintenance Manual on bitsavers > (02116-9153_2116B_Vol2_Oct70.pdf) contains several errors. > Interesting enough, my printed copy of this manual from 1968 (that is > completely different from the 1970 one; it only has parts lists and > schematics, the chapters for installation and maintenance are simply not > there) is right: 2140-0035 6.3V 0.04A > > In the meantime I've ordered a bunch of JKL 345 from Mouser (60 Ecent/piece) To mention, they are actually run below-spec in the processor, which of course improves longevity and reduces the heat next to the plastic front panel. From actual measurements in my 2116C the lamps (CM345) draw: register-bit positions: ~ 31ma @ 4.1V inside the push-buttons: ~ 36mA @ 5.4V compared to the spec: 40mA @ 6V ( I obtained CM345s from Mouser in 2013. "95 in stock", that would have left 83 after my purchase).
Re: HP-2116 front panel lamps
On Wed, 25 Jul 2018, GerardCJAT wrote: When I was "doing sort of " C.E. for 2116 ( 1971 _ 1981 ), we were using CM 380 as replacement. Even longer life !! Good info! Don't know how I could miss this one, it is even cheaper than the 345. I think I wanted to stick to the same type as the ones in the panel. Christian
RE: HP-2116 front panel lamps
On Wed, 25 Jul 2018, it was written 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! Yes, the Installation and Maintenance Manual on bitsavers (02116-9153_2116B_Vol2_Oct70.pdf) contains several errors. Interesting enough, my printed copy of this manual from 1968 (that is completely different from the 1970 one; it only has parts lists and schematics, the chapters for installation and maintenance are simply not there) is right: 2140-0035 6.3V 0.04A In the meantime I've ordered a bunch of JKL 345 from Mouser (60 Ecent/piece) :-) Christian
RE: HP-2116 front panel lamps
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 On Behalf Of Christian Corti via cctalk Sent: Wednesday, 25 July 2018 6:41 PM To: cctalk@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 1 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
