Most viewed - National Electric 872A

File information
Filename:	National_Electric_872A.JPG
Album name:	FGS / Vaccum Tubes
Keywords:	Miscellaneous
Filesize:	134 KiB
Date added:	Dec 03, 2012
Dimensions:	1600 x 1200 pixels
Displayed:	951 times
Color Mode:	Unknown (2)
Color Space:	sRGB
Contrast:	Standard
DateTime Original:	2012:11:02 14:13:31
Exposure Bias:	1 EV
Exposure Mode:	0
Exposure Program:	Program
Exposure Time:	1/80 sec
FNumber:	f/3.3
Flash:	No Flash
Focal length:	5 mm
Focus Mode:	Auto
ISO:	80
Light Source:	Unknown: 0
Make:	Panasonic
Max Aperture:	f/3.3
Model:	DMC-FH22
URL:	http://www.galleryoflights.org/mb/gallery/displayimage.php?pid=14026
Favorites:	Add to Favorites

Comment 1 to 4 of 4

Page: 1

rjluna2

[Dec 03, 2012 at 09:25 PM]

Here is the spec at 872A / VT42A mercury vapour rectifier Very Happy

FGS

[Dec 04, 2012 at 05:54 PM]

Thanks. I put 5v into the filament and got a orange glow from one of the holes the lead goes into the cylinder. The cylinder started glowing a deep cherry red after a while. No mercury glow at all. Even on 12v. The cylinder just glowed a deep orange. I put my flyback lamp tester lead on the top contact. Nothing on either 5v or 12v.

rjluna2

[Dec 04, 2012 at 06:57 PM]

You can put 15 Watts, 120 volts incandescent light bulb in series between the filament and the anode (top of the tube) while the filament in 5 volts burning. That should have rectifier going Very Happy

/----\
| |
- <
_ > |-\
- < |
_ | |
| | <
\----/ > Light Bulb
| |
~ |
| |
\-------------/

Sorry that the ASCII format doesn't work well here Confused

FGS

[Dec 04, 2012 at 07:16 PM]

A drawing could be better. Very Happy

But thanks. I used a computer PSU to test the filament.

Comment 1 to 4 of 4

Page: 1

Gallery of Lights

National Electric 872A

Traded Jace a light fixture for this tube and a socket for it. It's a mercury rectifier.