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

[vilgotch1 at gmail.com]

On a related subject, I had a boatanchor panoramic adaptor made by 
Singer where the sweep control was achieved by varying the intensity of 
a little lamp shining on a neon tube. That was enough to control the 
point at which it fired and initiated the sweep. Alas long gone..

Morris


------ Original Message ------
>From "Richard Knoppow" <1oldlens1 at ix.netcom.com>
To boatanchors at mailman.qth.net
Date 19/06/2024 7:16:38 PM
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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