[Milsurplus] Fisher Research Labs

[Marty R's GI-stuff haunt]

I found a 2nd FRL TS25 yesterday.  A TS25-3 that has 4 xtal channels ane
a 5th MOPA.  Tube line-up is 6V6 & 807 RF & pr 6L6s directly driven by
carbon-mic xfrmr.  Sig. Corps triangle-in-square stamps, pre-war dogbone
resistors, etc.  807 is white ceramic based Wl807/VT100.

FRL mentioned in

   http://www.portorfordlifeboatstation.org/newitems.html

which led to

   http://www.fisherlab.com/fisherbeta/Operation_Man/Opman.asp

They'r still in business making metal detectors.

Tho FT171-base xtals long-gone, front panel has last service freq.s  and
one is

           ---4495----

I've read the tower-to-ground/interplane late 30s freq.s were 3105 & 6210 for
civilians & 4495 for commercial.**

D'yas think these Fishers were installed @ left-coast airports in late 30s
& sig-corps lads went around, tested same, then stamped 'em??

I posted an inquiry on the TS25 last Feb on boatanchors & nada.

Lessee what we turn up here

   Marty

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  Date: Sat, 23 Feb 2002 23:47:12 -0500 (EST)
  From: "Marty's Refl. Drop" <polepeeg@aa4rm.ba-watch.org>
  To: Old Tube Radios <boatanchors@theporch.com>
  Cc: w2cqh@asti.net
  Subject: Fisher Laboratories, Palo Alto
  X-Listprocessor-Version: 8.2.09/991022/14:20 -- ListProc(tm) by CREN
  
  Found a TS-25 & a RS-25 RX/TX pair near Noble, GA today.  These seem to
  be a xtal-controlled ship-shore pair made ~1940.  All capacitorw were
  Oakland, CA Girrard-Hopkins which were in 1st HP 200s.
  
  TX uses 807 & 2 6L6 mod.s.  TX & RX xtal controlled w. on 4 chan.s w. great
  big FT171 xtal,s
  
  Tho look to be pre-WW2, each has MFP '51 stamp.
  
  Go figure.
  
  C'mon left coasters
  
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*  Have a BC230/430 C181(?) coil assy that has xmt-mica-body 4495 xtal.