QST
I've got a really nice though somewhat large Pi-Coil bandswitch
assembly for sale that may be of interest to someone on the reflector.
The Pi coil is wound in 3 co-linear sections:
24 T #12 copper wire 6" long on a 3½" diameter ceramic form --
my calculations show 22uH
6T ¼" Copper tubing 2" long 3" diameter -- another 2.5 uH
& 6T ¼ Copper tubing 2½" diameter by 2½" long -- 1.8 uH
Including the end stuff this assembly is about 14" long overall
so, it isn't for a small amp.
The copper is tarnished, but not too bad -- a quick dip in Tarn-X
or vinegar should clean it up.
The bandswitch is 6 positions -- very heavy duty. The contacts are
3/8" diameter (and about the same hi!) and the rotor contact is a pair of
3/8" wide strips. It has a nice roller detent on the rotor. This was
obviously originally some commercial switch but, the components have been
remounted to a large (6" x 8") sheet of plexiglass. Four of the 6 taps
are currently connected to the coils with 1/4 wide strap.
Finally, there are three large 6" ceramic and glass standoffs that
support the coil assembly.
I'm asking $50 for the piece plus shipping if necessary.
I also have a (used) Square D, size 2, two pole, contactor rated at 50
amps (600 V max) -- the coil is 120VAC I'm asking $20 for this unit
plus shipping if necessary.
and a...
Filament choke for a GG amp. Bifilar wound #10 wire on ½" dia. by 7½"
long ferrite rod. Used, good condx -- $15 psin.
73,
Marv WC6W 310 649 3111 (reasonable hours Pacific time, please)
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