Why Orange 0A2 VR Tube?

[Scott Johnson]

If it is orange, it is an OB2 (neon), if it is violet, it is an 0A2 (argon).

----- Original Message -----
From: "Glen Zook" <gzook at YAHOO.COM>
To: <BOATANCHORS at LISTSERV.TEMPE.GOV>
Sent: Sunday, January 18, 2004 8:49 AM
Subject: Re: Why Orange 0A2 VR Tube?


> It depends on just how much voltage that it being
> applied to the tube before regulation.  The higher the
> voltage, the brighter the "gas" in the tube glows.
> Since this voltage is usually supplied through a
> dropping resistor, the more current the regulated
> voltage is supplying the lower that this applied
> voltage is going to be.  Thus, if the supply voltage
> is not "dropped" by the series resistor by as great an
> amount due to the voltage regulator only providing a
> fairly low current, then the tube is going to glow
> brighter.
>
> Conversely, if the voltage regulator is supplying near
> the maximum current (if I remember correctly, 30 mA
> for an 0B2), then the tube is not going to glow as
> brightly under the same initial supply voltage
> conditions.
>
> Glen, K9STH
>
>
> --- "Greg Gore; WA1KBQ" <GARDGORE at AOL.COM> wrote:
>
> Why does the 0B2 VR tube in some communications
> receivers light up with a very bright orange and in
> others it does not?
>
>
> =====
> Glen, K9STH
>
> Web sites
>
> http://home.comcast.net/~k9sth
> http://home.comcast.net/~zcomco
>
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