[Boatanchors] Want to buy a pair of tested 5651WA voltage regulator tubes (new)

[John Poulton]

Sorry to come in late on this discussion, but..   I have a BUNCH of these
tubes, including a sleeve of 5 brand new 5651WA's (marked "Radioactive"!),
if anyone on the list needs them.

73, John K4OZY



On Wed, Jun 19, 2024 at 9:29 AM Gary Hitchner <talgarth at comcast.net> wrote:

> There is a test listed for a 5651 on the 752A, I found several tubes here,
> will attempt test and send to Doug.
> Gary
> WA2OMY
>
> -----Original Message-----
> From: boatanchors-bounces at mailman.qth.net
> <boatanchors-bounces at mailman.qth.net> On Behalf Of Richard Knoppow
> Sent: Wednesday, June 19, 2024 5:17 AM
> To: boatanchors at mailman.qth.net
> Subject: Re: [Boatanchors] Want to buy a pair of tested 5651WA voltage
> regulator tubes (new)
>
>     Well, not exactly. Light affects the strike voltage, in the dark the
> required voltage is higher. In fact, they work better with some light.
> Some gas tubes were made with a small amount of radio-active material to
> energize them in the dark. They usually have the triangular mark showing
> radioactivity. For a 5651 the data sheet shows a strike voltage in darkness
> of 160 volts and in light 115 volts. I have not seen anything about
> operating in direct sunlight. That would seem to be rather unusual and
> might
> cause some trouble but room light should not cause trouble and in fact,
> might insure the tube fires reliably.
>
> On 6/19/2024 1:00 AM, Brian Clarke wrote:
> > Another problem with gas-regulated tubes is exposure to sunlight. If
> > even small amounts of sunlight get to the tube, its behaviour will be
> > erratic. So light-shielding is the answer.
> >
> > 73 de Brian, VK2GCE
>
>
> --
> Richard Knoppow
> Los Angeles
> WB6KBL
> SKCC 19998
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