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Old June 9th 07, 02:08 AM posted to rec.antiques.radio+phono,alt.binaries.pictures.radio
John Byrns[_2_] John Byrns[_2_] is offline
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First recorded activity by RadioBanter: Apr 2007
Posts: 61
Default Stewart-Warner reactance dimmer

In article ,
Randy or Sherry Guttery wrote:

Randy or Sherry Guttery wrote:

a bunch of stuff...

Let me add a point... when I originally looked at the schematic - the
saturable reactor was drawn as a transformer - though it didn't take
long to figure out that it had to be a form of saturable reactor rather
than a transformer... (being an early schematic, I doubt the "standard"
for indicating saturable reactors had been established, and certainly
not yet in common use).

That only leaves figuring out whether the S/W is a two or three legged
configuration (are the two load windings on the same leg). As noted - a
picture might tell a lot.


Dave has now posted a picture, it appears to be a three leg core with
all three windings on the central leg.

Also - note that the GE version is a fully
buffered (isolated) and driven system - while the S/W's system is part
of the RF / IF B+... the differences make a significant impact on how
the two circuits act (and interact)...


I don't see how the "buffer" in the GE circuit makes any difference at
all, S-W simply make the RF and IF tubes do double duty, serving as a
"buffer" in addition to their normal functions. The buffering aspect
seems to work in an identical fashion to the dedicated "buffer" in the
GE radio.


Regards,

John Byrns

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