Nigel -
The receiver in question uses full wave rectification, with the
exception of a "zero current" Bias supply which is half-wave. I believe
this is the case in all Drake receivers.
The transmitter power supplies use voltage doublers, which seems to be
typical of the higher power supplies. I assume at least part of the
reason is it's easier to wind 400 turns of #20 wire than 800 turns of
#30 without breakage. I don't think copper prices were as significant
then as they are now, but ...
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 4-B, C-Line& TR-4/C Service Supplement CDs
<www.k4oah.com>
Nigel Gunn G8IFF/W8IFF wrote:
I beleive that one of the main causees of transformer heating appears
to be the use of half wave rectification and half wave voltage
multipliers. It saves on diodes, causes lousy voltage regulation and
can cause core saturation in the mains transformer if the seondary
current increases.
This seems more prevalent in US than UK equipment which, unless
extremely cheap, always seems to use full wave rectification.
Don't know which Drake tended to use. Probably a mixture of both.
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