[R-390] Arcing in 25Z5Ws

[wli]

My philosophy may be a variance with many (including
the DOD) but I favor the 12BW4 sub in place of the
25Z5W's.

a) Obviates deleterious effects of sudden B+
application to cold receiving tubes, which in itself
is controversial even among us.

b) Plentiful 12BW4 replacements still available.

c) Simple underchassis rewiring, that's easily
reversible. See  
http://www.mines.uidaho.edu/~glowbugs/r390_psmod.htm

d) If B+ ends up too high use a bucking transformer or
a Variac.

e) That said,  the SS subsitution is an *approved*
change, whereas the 12BW4 is not.

Thanks

W. Li


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