[Milsurplus] R-26M/ARC-5 autotuned receiver

[Hue Miller]

Michael, this site has a photo with the R-26M AND the ARB
with the ART-13.  The doc seems to say that there would be
a standby receiver besides the one working with the ART-13.

http://www.twinbeech.com/images/Radio/yardneyARC5/YardneyinTBM.pdf

Is this correct, your spot tuned receiver does NOT have an "M" suffix?
I have a manual, somewhere, on modifying the R-26 receiver by attaching
the tuner. This is a Navy manual but right now i do not recall its nomenclature
format. We can maybe therefore agree that a "field modification" was not
extraordinary. However, this raises the question for me now, did the field
mod include labeling the receiver with an "M"? I don't see how the field 
forces could actually do this. The one R-26M i owned (regrets) did have
a professionally, factory labeled nameplate. But such label equipment would
not be available to field forces.

Mike (Hanz), i (mis)read ahead the same doc referenced above. The field
trials in the last week of WW2 indicate this combo never actually saw action.
So there was a somewhat shortened span of time this receiver would have
been used, the constraining factors being the decreasing numbers of TB- and
SB- aircraft in the postwar period, and the arrival of the ARR-15, when, 1948?
-Hue Miller