[ARC5] R-11A and R-511 info

[Dennis Monticelli]

I picked up an A.R.C. R-11A and an A.R.C. R-511 receiver at the swap
today.  I presume these are a part of the Type 12 series.

Both radios have 85 KHz IF's so they must be VLF units.  Does anyone
know what is different between these two models and also how different
they are from a BC-453?  I noticed that they have mostly loctals for
tubes.  Can you still find control boxes for them and are schematics
available?  A quick scan of the web revealed little info and no
schematics.

Dennis AE6C