USED
Ex various 1960's domestic valve receivers & radiogram front panels (usually sitting behind glass)
Oh yes, my wordee this is OLD technology but if ever you need to find either the lamps or the special Edison socket with mounting this can be quite a challenge. That's why I have always kept this type of component when the equipment went to the "operating table" (workshop) and underwent surgery to become an organ donor to give life to another piece of equipment.
UNIDENTIFIED MANUFACTURER(S) - Incandescent Lamp Socket, Mounting Bracket & Lamp
I have a small number of these, all are identical (see the photograph)
The bracket has a spring clip so that it can be attached to a strip of metal, usually in a hidden area of the front panel. The idea was that these lamps provide a backlight source, providing light through a translucent front panel so that the panel "lights up"
The socket is a miniature Edison screw type, copper bottom contact inside and the body is Brass
Two solder tag contacts are provided from the socket
If you look at the photograph closely, you can see the insulating rings which were fitted over the socket. These may or may not be necessary in your application, one is included with each lamp/socket/bracket.
NOTE: The entire socket is electrically insulated from the mounting bracket, which means one "side" of the 6.3V AC supply appears on the outside of the socket but not to "chassis" The insulating ring is to ensure this remains the case in various mounting situations.
The lamps are 6.3V @ around 60mA ~ 100mA (some varied upon testing, see below)
Type numbers of the lamps vary, some are XAM3516 & others are not marked with a type or manufacturer at all (the lamps with the Brass bases only indicate 6.3V 100mA)
NOTE: ALL lamps have a small dot of White "cement" to keep the lamp securely seated in the socket. This cement is very easy to "break" so lamp removal is not a problem
DIMENSIONS:
Bracket: 11.90mm wide x 10.5mm height clip, L shaped 16.25mm wide
Lamps: "stock standard" panel lamps of the day, glass envelope is 9.5mm diameter x 13.95mm height
TESTING:
Being old components, I have tested each that I have found ....
Testing made at 6V DC, and ALL that I have light up nicely - that soft reassuring Yellowish glow (with a bit of heat!)
If the question has crossed your mind, why on earth are these designed for 6.3V operation? Weird voltage ... caste your mind back to the heady days of valve equipment. Most valves (but not all) used 6.3V as the heater supply, so a 6.3V AC source was readily available in this equipment, at a reasonable current.
I also tested the COLD DC resistance of each filament and found quite a variation, although they all lit up with very similar brightnesses. Most were around 60 Ohm cold but some were much higher - I suspect this could indicate how long the filament has been "lit up" in the past.
The lamps are of course used, their remaining lifetime is completely unknown .... but at least today, they all lit up fine!
COSMETIC CONDITION:
USED
Ex domestic equipment such as HMV etc
CLEAN
I checked the integrity of the glass envelope/base (sometimes they can separate) - all good here.
All socket base contacts were fine, no corrosion observed
The Brass sockets have some light discolouration on one side, this looks to have been applied intentionally when manufactured.
Solder tags are clear of solder dags, ready to go ....
The plastic socket insulators have a "twisted" split, this is perfectly normal so that the insulator can be expanded when fitting to the socket (if desired)
Each bracket/socket/lamp assembly is now individually packed into sealed clear plastic packets
