[ARC5] OD3 VR Tube

[Kenneth G. Gordon]

On 8 Nov 2012 at 20:47, k7mks at comcast.net wrote:

> The design of t he Chatham Electronics JAN OD3 VR tube is unique
> with its brown colored base that extends almost full height of the
> tube.   There has to be a reason for this design - what is it?  
> I've also seen some rectifier tubes with this similar design.

I have a number of those VR-tubes myself, and have never understood that.

For one thing, VR-tubes must be able to have some input from light to 
"encourage" the formation of the internal "plasma"

Ken W7EKB