I picked this gizmo up at the local junque shoppe. Pics on a.b.s.e. It >appears to be an r.f. tuned cavity. Any info or comments?
This looks like the Ballantine version of the same cavity: ><http://www.surplussales.com/EQUIPMENT/TESTEQUIPMENT/TESTEQUIP-19.HTML>
Tucker has a manual for it for 20 bucks. http://www.etestmanuals.com/Search.aspx?Mfg=SRI
Just picked this gadget up at the local junque store. Apears to be an r.f. tuned cavity. It has a acorn tube inside with marking "5 mA" that I can't identify. Any info or ideas as to what this might be worth? If nothing, at least it has a nice barrel micrometer on the end that I can put to use.
More info: The Ballentine Model number lead me to this description:
"Attenuator-thermoelectric highfrequency voltmeter" and patent:
https://www.google.com/patents/US2933684
On Thu, 06 Oct 2016 21:25:59 -0700, "Paul Hovnanian P.E." <paul@hovnanian.com> wrote:
I picked this gizmo up at the local junque shoppe. Pics on a.b.s.e. It >>appears to be an r.f. tuned cavity. Any info or comments?
Sensitive Research Instrument Corp (Singer Metrics or Singer Gertch)
made mostly electrostatic voltmeters. I couldn't find anything
Sensitive Instruments made that might be RF related. I have no clue
what an "AT Voltmeter" might be. The Ballantine 390 is listed as an
"A-T Voltmeter" but I don't want to download 38MBytes just to see the catalog.
This looks like the Ballantine version of the same cavity: <http://www.surplussales.com/EQUIPMENT/TESTEQUIPMENT/TESTEQUIP-19.HTML>
Kinda looks like the micrometer adjusts a big piston capacitor, and
not a RF cavity, but I'm gussing.
I don't think that glass device is an acorn tube. Not tall enough,
not enough leads, no filament, and not enough external connections. My guess(tm) would be either a spark gap or a neon lamp protector.
There's a number on the bottom of the glass envelope, which might
help.
The link below is to the website of a deceased friend who collected
antique electronics. About 2/3 down the page are a number of their early >thermocouple based meters, along with a little of the history of
Sensitive Research. I have one of the 'Polyranger' meters that he mentions.
Randy Guttery was a US Navy Veteran, and a Broadcast engineer in
Meridian Mississippi. He was an excellent electronics tech, as well.
http://www.comcents.com/te.php
On Thu, 06 Oct 2016 21:25:59 -0700, "Paul Hovnanian P.E." <paul@hovnanian.com> wrote:
I picked this gizmo up at the local junque shoppe. Pics on a.b.s.e. It
appears to be an r.f. tuned cavity. Any info or comments?
Sensitive Research Instrument Corp (Singer Metrics or Singer Gertch)
made mostly electrostatic voltmeters. I couldn't find anything
Sensitive Instruments made that might be RF related. I have no clue
what an "AT Voltmeter" might be. The Ballantine 390 is listed as an
"A-T Voltmeter" but I don't want to download 38MBytes just to see the catalog.
This looks like the Ballantine version of the same cavity: <http://www.surplussales.com/EQUIPMENT/TESTEQUIPMENT/TESTEQUIP-19.HTML>
Kinda looks like the micrometer adjusts a big piston capacitor, and
not a RF cavity, but I'm gussing.
I don't think that glass device is an acorn tube. Not tall enough,
not enough leads, no filament, and not enough external connections. My guess(tm) would be either a spark gap or a neon lamp protector.
There's a number on the bottom of the glass envelope, which might
help.
Value? No clue.
On Thu, 27 Oct 2016 17:14:59 -0400, "Michael A. Terrell" <mike.terrell@earthlink.net> wrote:
The link below is to the website of a deceased friend who collected
antique electronics. About 2/3 down the page are a number of their early
thermocouple based meters, along with a little of the history of
Sensitive Research. I have one of the 'Polyranger' meters that he mentions. >>
Randy Guttery was a US Navy Veteran, and a Broadcast engineer in
Meridian Mississippi. He was an excellent electronics tech, as well.
http://www.comcents.com/te.php
Thanks. Of the test equipment shown, I think I have either used,
owned, or still own much of it. If ever get tired of the stuff, I'll
open a museum. I've seen some Sensitive Research stuff at various
times, but was never into calibration or metrology, so they were of
little interest. Thanks much.
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