The DX-100 High voltage is choke input by design. I changed the low
voltage supply to choke input as well and the rf stages are behaving
very nicely with that. I already think my line is "high" and I'll take
readings various times as you have suggested. Light bulbs don't seem to
last very long here, either.
Tom asked about bleeder current. I didn't try to measure it but I
watched the high voltage decay to zero in a very few seconds when I
switched it off with no 6146s in the sockets.
In my (very distant) youth I came by a DX-100 that had been built from
kit by a local, who could never get it to work. I spent a few
interesting weekends studying the circuit and the construction, and then
set to with a hot soldering iron and got it working. I used it as my
one and only TX for a fair few years, modifying it to do this and that
as I went along.
Mine was fed from 230 volt mains, and as I recall the HV was in the
region of 900 volts off-load, sagging quite a bit on-load. I never
worried about it, and the PA valves remained happy throughout. The
electrolytics didn't go bang either, but they were very much younger in
those days.
I eventually sold it to a local dealer and put my pocket money to it to
buy an FT101E which I still have and use with my VHF and UHF transverters.
73
Keith
G3OIT
_________________
Topband Reflector Archives - http://www.contesting.com/_topband
|