[ARC5] OD3 VR Tube

[Geoff]

Shock resistance.

The 5R4 had a few versions, the 807W/5933 are other well known examples.


----- Original Message ----- 
From: "Kenneth G. Gordon" <kgordon2006 at frontier.com>
To: "arc5" <arc5 at mailman.qth.net>
Sent: Thursday, November 08, 2012 4:06 PM
Subject: Re: [ARC5] OD3 VR Tube


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
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