[Milsurplus] BC-221

[Ray Fantini]

One thing always leads to another, although I have radios that are
accurate to within a few cycles on the other side of the room, the back
side of the room is where the tube radios are located, am practicing a
strict policy of segregation- tube radios in one location, transistor in
the other. so in running a TCS transmitter along with a HRO receiver the
first thing you find is that you have no idea what frequency you are on.
the solution is a BC-221, had one in the back and cleaned it up but have
to build a AC power supply. the schematic calls for 135 Vdc, I am
assuming that it will need to be regulated. was the stock internal power
supply regulated? I was thinking of using a 0C3 or a 0D3 the problem
being they are 105 or 150 volt tubes, will the unit work well on 150 Vdc
or should I use a voltage divider with a 105 volt tube on the end to get
my 135 Vdc? or just operate the meter from 105 Vdc? is the little hole
on the side of the case for the power cord to exit? and last but not
least has anyone had any success changing the plastic window over the
book, looks like I may have to drill out the rivets that held in the old
plastic. already striped , cleaned and painted the case but have no idea
yet on replacing the plastic.
Ray Fantini
www.ka3ekh.net