"John, N9JG" wrote in message
news:nrlgf.348383$084.317895@attbi_s22...
I am planning to order meter illumination pilot lights for my Drake L-4B
from Play Things Of Past http://www.oldradioparts.com/. The pilot lights
are type 1850, 5V @90 ma, bayonet. I would like to know how easy/difficult
it is to replace these bulbs. I am hoping that all I need to do is to
remove the amplifier top cover. The instruction manual does not mention
replacement of these pilot lights. Maybe they did not anticipate that the
amplifier would still be in use after 30 years.

John, N9JG

(remove ".XremoveY" from above address)
One stop for good minature bulb references, Chicago Miniature Lamp (now CML)
http://www.chml.com/

Incandescent Lamp Applications (great Tech Notes for bulb selection &
substitutes) - Adobe Acrobat
http://www.chml.com/assets/databookp...Tech_Notes.pdf

An 1850 is a T-3 1/4 Miniature Bayonet Base
ALSO, notice that this bulb only has a 1,5000 hour estimated life
MS CP will give you a "rough" brightness indication for your application

Miniature Incandescent Lamp References (they have LEDs also)
http://www.chml.com/assets/databookpdf/2-53.pdf

w9gb