[Amps] 2 x 3-500Z filament choke + 30/60/80A fil chokes

[Jim Thomson]

** I dont know where you are getting 43 mix rods Jim since Fair-Rite doesnt 
make them.
The 33 mix is the choice plus it is temperature stable to a high degree.

###     http://www.surplussales.com/Inductors/FerRods/FerRods.html  at the very bottom.

Dunno where sson gets em from.  They have gone way up in price too. They had em
on sale several years ago, so I got just enough spares for one more project.  
These are 1/2"  diam x 8" long..and are type 43 rods.  2 of em...+ 8 or 10 ga magnet
wire, paralleled in the fashion I described works fine on 160-10m...and will easily
handle 60/80 A CCS. 

## since at the time, those 12" long x 1"  diam rods were no longer available, we had to
go to plan B.  John Lyles suggested to me to  use 2 x rods, each bifilar wound, then parallel
the windings, but it has to be done correctly.   Parallel any one winding from rod A...with any
one winding from rod B.....and vice versa.    What baffles me is the uh does not drop in 1/2,
like you would think it would.   It does drop to 73% of it's original uh.  In the case of the 10 ga
magnet wire set up, each winding is 52 uh....and drops to 38 uh  when windings paralleled as just described. 

##  In any event, it works superb, and has been used in a lot of amplifiers in the last few years. I wasn't 
about to trust 50A through 8 ga magnet wire on a single rod, so used 2 x 10 ga's in parallel as above. 
When it came to the 79A  fil choke, we thought, yikes, now what do we do.  Tried the same stunt, except
used parallel 8 ga magnet wire.  Both of em are tried and proven from 160-10m. 

##  Now who the heck made that giant 12" x 1"  type 33  rod u used to sell ?   Is it still available?   I checked
all over the place several times years ago..and could never source it, so gave up... and went to plan B. 

Later... Jim,  VE7RF