Report Review for product Dial Lamp - LED version, #47 or #44, T-3-¼, 6.3V, Bayonet Base

I tried these lamps in a typical AA5 series string set with a tapped filament 35Z5 rectifier. First there is a rather large collar (.460" diameter) around the base where the "bulb" meets the base. It is common practice to put an insulating sleeve around lamp sockets and the collar prevents the insertion of the bulb. You have to trim the sleeve back to allow the bulb to seat in the socket. Don't try to remove the collar. It is part of a sleeve that holds the bulb to the base.

The LED replacement worked very well. The bulb lit up brightly, visually similar to a #47. The light dispersion is relatively even and diffused from the sides and the end. The manufacturer did it right by using a bridge rectifier inside which increases the apparent intensity and helps to reduce strobing. The warm white color temperature of the LED lamp is somewhat higher than the usual #47 incandescent which gives the light a more white appearance.

Then I installed two bulbs into a Zenith 6D029 table radio. This radio uses two #1490 3.2 volt lamps in series. Because the LED uses so much less current than a #47 or #1490 both bulbs lit up very well at full intensity and were much brighter than the #1490s. I gave the LED replacements four stars because of the collar, and the base is a thin metal which dents easily, but otherwise they work very well.