|[AMRadio] R-390A Help|
ne1s at securespeed.us
Tue Jul 8 07:06:52 EDT 2014
Another way of dealing with missing or bad 26Z5s is to rewire the
sockets for 12BW4s, connecting the heaters in series. IIRC this was
published long ago in Electric Radio, along with the suggestion of using
a PL34 (an inexpensive tube at the time) to replace the 3TF7 regulator.
The latter also required a slight re-wire of the socket, again IIRC. I
did both mods when I acquired an R390-A about 13 or so years ago and
never looked back.
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