[TenTec] Titan 425 Meter lamps?

[geoffrey mendelson]

On Oct 3, 2010, at 12:59 AM, Dr. Gerald N. Johnson wrote:

> The lamps could be in parallel. The schematic is badly drawn. Two on
> line vendors of lamps
> http://www.donsbulbs.com/cgi-bin/r/b.pl/1820|28v|0.1a~usa.html
> and
> http://bulbster.com/lightbulbs/eiko-1820bts-49790-p-2306.html
> claim the lamps are 1820 but two 1820 in parallel at 28 volts will  
> draw 200
> milliamps and fry that 20 ohm 1/2 watt resistor with 0.8 watt  
> dissipation.



After being the owner of what may be the last remaining box of #47  
bulbs in Israel, I decided to look for other sources. I found that the  
cost of shipping ranged from $13 to $35 for a box, while the box  
itself ranged from $3 to $12.

I gave up and replaced them with LEDs.  Super Bright LEDs http://www.superbrightleds.com/ 
   has LEDs that replace bulbs. They have a #47 replacement that works  
on AC or DC and just goes into the socket. It has 180 degree  
dispersal, so it works light a light bulb. Their white bulbs are  
"daylight" colored so they are bluer than regular bulbs.

So far I've replaced #47's in Drake equipment, and used their 12 volt  
bulbs in an Argo 509 and matching (405) amp. The Argo has 2 redish  
grain of wheat bulbs for the dial and a socketed 12v bulb. I replaced  
the socketed bulb with a white LED bulb, but left the grain of wheat  
ones because they work, and are such a pain to replace (you have to  
pull the font panel). Someday, I'll get energetic and replace them. :-)

For international buyers, they sent my first two orders in a padded  
envelope for just over $5 in shipping. The third order was slightly  
larger and sent in a box, which delayed it two weeks. :-(

Geoff.

-- 
Geoffrey S. Mendelson,  N3OWJ/4X1GM
To help restaurants, as part of the "stimulus package", everyone must  
order dessert. As part of the socialized health plan, you are  
forbidden to eat it. :-)