Spider Coil Form
PO - AC-100 1 Tube Regenerative Set.
|PO? What is the PO you ask. Well I'll tell you... Peebles Original!
If not for Mike's schematic, parts and guidance this radio would
of never been created. I started with an experimental set of
coils. I built a baseboard with 11 nails strategically placed in
a perfect circle. Then another circle just inside of that one.
That will give you what is called a basket weave. I used
what is called a 1 over and 2 under. There are several different
ways to wind a basket but my favorite is what I used. The
main coil measured exactly 232 uH and the tickler coil measured
somewhere around 40 or 50 uH. If you want exact measurements of
my base please email me
and I can send them or update this page. Next was tackling all
those components. I opted to put them all on a breadboard except
for C6, that needs to be as close to the tube base as possible.
I fabricated a dowel slider system for the coils. Once they are
set they usually do not need to be adjusted again. This is for
different antennas or for some reason coupling needs to be changed
between the two coils. As a general rule, 1/8th to 1/4 inch
should do the trick. The base is made of solid oak with a mild
taper around the ends to dress it up a bit. The black material is
lexan that is painted black. The trick here is once you have it
painted, TURN IT OVER. This gives it a nice glossy appearance and
allows you to work on it without scratching it. One variation to
the schematic is the trimmer capacitor. I opted for a variable
but I'll tell you at just about 40 pF is where your best reception
comes in. The B battery is a quite different isn't it? Even
you old timers have probably not seen one of these before. Well,
it's called a BA-5557 and is Military use only. How did I get
one? Easy, I'm a commo guy in the Military. These batteries
give off somewhere around 2.5 Amp hours. Bottom line, these
lithiums got some umph behind them. There are two (2) 12~14v
cells in the battery. They can be either wired in parallel for
extra amperage or in series for extra voltage. I opted for the
the 28v to power the 3Q4. The last piece I want to mention is the
front panel. Don't laugh but I bought a cutting board at LOWES.
It's perfect and cheap.