[Hallicrafters] Pilot Lamps

[Rich Oliver]

Ken,

Those numbers I quoted are from the Chicago Miniature Lamp section of 
the Newark catalog, presumably straight from CM.  Their 1893 is rated 
14.0 Volts at 330 ma for 3000 hours.  My catalog does not go into 
brightness but generally speaking it correlates (4/3 power law, I 
believe) with the power consumed, so brightness of these bulbs should be 
rather different.  Also, remember that most of the power consumed by a 
lamp is turned into heat, and that can be important in some situations.

I don't know about the RS bulbs but suspect they come from the left side 
of the Pacific.  If they claim lower life expectancy than CM I'd be 
inclined to believe them.

Info on Chicago Miniature products and distributors is on their site:

http://www.sli-lighting.com/cml/electronic/index.cfm

Cheers, Rich, KC9GQ

Kenneth D. Grimm, K4XL wrote:

> Hi Rich,
> 
> You are right about the Chicago 1891 being a 500 hour bulb.  My problem
> is that all of my local Radio-TV distributors have closed down and I'm
> at the mercy of Radio Shack for quick replacements.  They show their
> 1891, and several others too, as having a life expectancy of 30 hours.
> 
> I took Ron Kolarik's advice and looked in my local auto parts store and
> found lots of 1891s, but no 1892s.  I did notice that they had an 1893
> with which I wasn't familiar.  Now that I'm back in the shack and have
> access to the catalogs, I discover that it's a 14 volt bulb with the
> same brightness of an 1891, a little more current, and a life expectancy
> of 7,500 hours.  Even if this baby becomes fragile after a thousand or
> so hours I think I'll try some in the gear that I never open except to
> change out a dead pilot light!  8*)
> 
> 73,
> Ken K4XL
> k4xl at arrl.net
> *** BoatAnchor Manual Archive ***
> On the web at http://bama.sbc.edu or
> FTP site info: bama.sbc.edu login: anonymous p/w: youremailadr
> 
> 
> ----- Original Message -----
> From: "Rich Oliver" <Rich.Oliver at lowell.edu>
> To: "Kenneth D. Grimm, K4XL" <K4XL at arrl.net>
> Cc: "Gary Franklin" <franklin6209 at chartermi.net>; "Hallicrafters"
> <hallicrafters at mailman.qth.net>
> Sent: Tuesday, April 16, 2002 10:44 AM
> Subject: Re: [Hallicrafters] Pilot Lamps
> 
> 
> 
>>Ken et al,
>>
>>The 1891 is rated for 14.0 Volts at 240 ma for 500 hours; the 1892 is
>>14.4 Volts at 120 ma for 1000 hours.  I tried switching to long life
>>bulbs (756's, as I recall) in my TR-7 and found that they do indeed
>>
> last
> 
>>a long time if left alone, but they become very fragile and the
>>filaments break from the slightest shock.  That means you have to
>>
> change
> 
>>the bulb every time you take the covers off or even just move the rig,
>>so I switched back.  Now I'm thinking of switching to LED's.
>>
>>73, Rich, KC9GQ
>>
> 
> 
>