I went to a hamfest last weekend and found the Chicago FM Club selling papers from a SK estate to raise funds. A few caught my eye and I will be scanning them and putting them up for distribution as time becomes available. The first one follows:
T H O R D A R S O N
The Complete Transformer Catalog 400-CX
1939 -- SPRING -- SUMMER -- 1939
(Supersedes 400-AX and 400-C)
THORDARSON ELECTRIC MFG. CO.
500 W. HURON ST., CHICAGO, ILL.
Demand "Power by Thordarson"
POWER * CHOKES * AUDIO * DRIVER * OUTPUT * MODULATION *
PLATE * FILAMENT * C.H.T. * TRU-FIDELITY
This is a high quality pdf, 15.7 Mb but get it once, print it out or put it on a memory stick and you have a useful transformer/tube/circuit reference.
24 pages:
http://home.fnal.gov/~atkinson/thordarson.pdf