[GreenKeys] REC-23

[William Wuttke]

 I learned about saturable reactors over 50 years ago in Air Force Tech School. The
circuitry of these rectifiers uses some sort of saturable reactor to control the voltage.
Comparing the REC-13 (60 Hz) and the REC-23 (50 Hz), the circuits are exactly the 
same. The power transformer and filter reactor are the same part number. However,
the reactor-regulator and shunt reactor have different part numbers. This would seem
to indicate that the regulating circuitry was designed specifically for line frequency.
Consequently, although the REC-23 will "work" on 60 Hz, its regulation characteristics
will be different. But exactly how? I forgot everything I learned about flux density vs
frequency vs dc current flow, etc., a long time ago.

Bill
KE3BK
     On Wednesday, August 4, 2021, 07:11:20 PM PDT, <hwhall at compuserve.com> wrote:  
 
 Not sure about the design or the limiting factor for the line frequency but 50Hz transformers usually operate comfortably on 60Hz. They just have more iron core than a 60Hz design would need. Assuming it's just a plain vanilla transformer, that is.

WayneWB4OGM

-----Original Message-----
From: William Wuttke <wcwuttke at att.net>
To: Greenkeys <greenkeys at mailman.qth.net>
Sent: Wed, Aug 4, 2021 4:46 pm
Subject: [GreenKeys] REC-23

Is anybody using a REC-23 rectifier? I got one with my TT-7.  I originally thought it
was a REC-13, but found out it is a REC-23 (made for 50 Hz). I used a 60 watt bulb
to adjust the voltage as described in S-5331, but can't get the current up to 500 ma.
at the highest set of taps. Or, is the bulb really a 60 watt bulb? Or, does it really matter?
I wouldn't think it was that critical, especially if it is only used for the punch.

Bill
KE3BK
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