[time-nuts] Fw: Re: Re: Unobtanium bulbs for HP506x: Found 'em!

[Robert LaJeunesse]

   Sorry all, sent this to only PHK by mistake.  Now for benefit of the
   list.

   Bob L.
   Sent: Tuesday, January 31, 2023 at 2:46 PM
   From: "Robert LaJeunesse" <lajeunesse at mail.com>
   To: "Poul-Henning Kamp" <phk at phk.freebsd.dk>
   Subject: Re: [time-nuts] Re: Unobtanium bulbs for HP506x: Found 'em!
   Poul-Henning,

   I am under the impression from your link to the video that the Tec-Lite
   bulb holder was used in the HP506x. (I'd check, but I don't normally
   have access to one. Pix on the web didn't help.) If that is the case
   check the attached picture, where the arrow points to a small gap
   between the bulb flange and the threaded cover. Use a knife blade to
   pry the bulb, which is not threaded, out of the cover.

   If, in fact, the bulbs are T-1-3/4 screw base items there were few
   standards produced. One good reference to what was available back then
   is the Allied Radio catalog, which is online if you want the 1970
   version. (see
   [1]https://alliedcatalogs.com/flipbook/1970_allied_radio_catalog.html)
   In that catalog page 342 lists a dozen bulbs midget flanged, but only
   the 1768 and 1769 as screw based.

   Hopefully having the right part number for the bulb helps in acquiring
   what you need.

   Bob L.
   > Sent: Tuesday, January 31, 2023 at 2:06 PM
   > From: "Poul-Henning Kamp" <phk at phk.freebsd.dk>
   > To: "Discussion of precise time and frequency measurement"
   <time-nuts at lists.febo.com>
   > Cc: "Robert LaJeunesse" <lajeunesse at mail.com>
   > Subject: Re: [time-nuts] Re: Unobtanium bulbs for HP506x: Found 'em!
   >
   > --------
   > Robert LaJeunesse via time-nuts writes:
   >
   > > There are lots of this size bulb available, such
   > > as: [2]https://www.ebay.com/itm/314217639000
   >
   > But those dont have the threads necessary to screw them into
   > the lamp-holders on a HP5065 or HP5061 frequency standard.
   >
   > --
   > Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
   > phk at FreeBSD.ORG | TCP/IP since RFC 956
   > FreeBSD committer | BSD since 4.3-tahoe
   > Never attribute to malice what can adequately be explained by
   incompetence.
   >

References

   1. https://alliedcatalogs.com/flipbook/1970_allied_radio_catalog.html
   2. https://www.ebay.com/itm/314217639000
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