From: BobEngelhardt@comcast.net   
      
   On 7/29/2019 8:09 AM, Phil Allison wrote:   
   > ** A 120-120 transformer does not have equal windings, the secondary has   
   additional turns to allow for the regulation factor of the unit. Might be   
   anywhere from 4 to 20% extra turns on the output side.   
   >   
   > Also, a properly made 120-120 would also have good insulation between the   
   two windings rather than them being overlaid or wound bifilar.   
   >   
   > Another factor is magnetising current - transformer primaries are sized to   
   allow for the extra current but secondaries are not since there is none.   
   >   
   ...   
      
   Thanks - I had overlooked that.  It might not have mattered (lower   
   output might have been OK), but I'm not going to use one now.   
      
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