[volt-nuts] Neon bulbs for HP 3420B or 419A chopper circuit

[Jeremy Nichols]

Thank you, Charles, for the excellent summary and references.

Jeremy
N6WFO


On Fri, Nov 17, 2017 at 6:23 AM Charles Steinmetz <csteinmetz at yandex.com>
wrote:

> David wrote:
>
> >> to buy NEW bulbs from a reputable manufacturer who provides specs
> >
> > Any recommendations - I can't find a source in UK.   I know Philips used
> to make them, but where I'd buy a few &deity only knows.
>
> Google is your friend.  neon, bulb, lamp, radioactive, and "dark effect"
> are good search terms.  Here's what I found in about 5 minutes (all
> US-centric):
>
> Mouser and Digi-Key both have quite a variety of neon bulbs available,
> including bulbs with wire leads from VCC, JKL, and Lumex.  You would
> need to review datasheets and contact the manufacturers to inquire about
> radioactive additives:
> <
> https://www.mouser.com/Optoelectronics/Lamps-Holders/Lamps/_/N-5g6r?Keyword=neon&FS=True
> >\
>
> Other large distributors probably have similar selections.
>
> This catalog from  VCClite indicates that some of their bulbs have
> reduced dark effect, including the A1D-T and A2B, both of which Mouser
> and Digi-Key carry:
> <
> https://vcclite.com/wp-content/uploads/wpallimport/files/files/NeonIndicatorLamps.pdf
> >
>
> You will probably still want to find out for sure if the dark effect
> reduction is due to a radioactive additive.
>
> Here's some general information on glow lamps:
>
> 25 pages of glow lamp specifications from GE back in the day.  Quite a
> few of them are listed as having a "mild radioactive additive" to reduce
> the dark effect:
> <
> https://static1.squarespace.com/static/57ae25c75016e1690c41b053/t/57ae2fd003596ed24fa8f54c/1471033297306/Glow+Lamp+Specifications.pdf
> >
>
> The 1966 edition of the GE glow lamp manual can be found here:
> <
> http://www.ko4bb.com/getsimple/index.php?id=download&file=06_Misc_Test_Equipment/GE/General_Electric_Glow_Lamp_Datasheet_1966.pdf
> >
>
> Best regards,
>
> Charles
>
>
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