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I acquired this set in a local antique radio club auction
for the princely sum of five dollars. I suspected it was a
military morale set. due to the high tube count and JAN (Joint Army
Navy) numbers next to the tube sockets. The case is 18" x 12" x
10" and probably has been recovered with what looks like shelter-half
(pup-tent) canvas. It tunes three bands and includes an RF stage.
The tube lineup is 1LN5, 1LC6, 1LN5, 1LN5, 1LH4, and 3Q5; plus 25L6 and
25Z6. The audio transformer is hermetically sealed and
electrolytic caps look pretty military. |
I posted an "all -points bulletin" to a couple of radio
related mailing lists on the internet that included a link to these
photos. In short order a couple of people identified it as a
version of type R-100/URR, and Marty, AA4RM, replied with a link to his
website, http://qsl.asti.net/R-100/,
containing pictures, history and service info on these sets.
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I replaced the all the paper capacitors before trying the set as they were
members of the infamous Micamold clan. (See Replacement)
I elected to leave the original electrolytics, as they appeared
to be high-quality units and showed no sign of fluid leakage. I
also tested the tubes finding a defective 1LA6 convertor. The set
played immediately upon power up. I touched up the alignment,
just in case. Keep in mind that this is a "hot-chassis" AC/DC
set: Use an isolation transformer!
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The original dial and pointer were among the missing.
I used the blurry front panel image from Marty's sit as a guide
to produce a new dial scale using Corel Draw. This is
professional graphic-arts software with a lot of features that make
this a relative snap. For example, the individual dial ticks can
be rotated around the image to correct calibration. I recommend
it, but there is a learning curve involved. Calibration turned
out to be reasonably accurate with no tweaking.
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