From: themend@gmail.com   
      
   Thanks for the explanation, Phil.   
      
   BTW, I'm sorry I mistook you for a troll when I first returned to RAT.  While   
   you might be a bit gruff at times, you at least know what your are talking   
   about.  I'm sorry if I offended you, which was clearly my intent.  I'm not a   
   big fan of the    
   confrontational style of correcting somebody else's mistake, but I am man   
   enough to admit when somebody knows more about a topic than I do.  I am not   
   afraid to take on loudmouths like Andy, and I made a big mistake by putting   
   you in the same category as    
   him.   
      
   You have my attention.   
      
      
   -forkinthesocket   
      
      
   On Tuesday, February 11, 2014 1:55:10 AM UTC-5, Phil Allison wrote:   
   > "Patrick Turner" <   
   >    
   >    
   >    
   > > There IS BULLSHIT at this link about measuring resistance of tranny   
   >    
   > > windings.   
   >    
   > > Just ignore ignore it all.   
   >    
   > > Using any kind of meter on any tranny does no temporary or permanent harm    
   >    
   > > to   
   >    
   > > properties of windings or core.   
   >    
   > >   
   >    
   > > ** Really ?   
   >    
   > >   
   >    
   > > Bet you have never even seen an amorphous steel core or worked much with   
   >    
   > > microphone transformers that use materials like mu-metal.   
   >    
   > >   
   >    
   > >   
   >    
   > > OK, 99% of ppl here will never have experience with fancy core materials    
   >    
   > > where a small amount of Idc used to measure coil resistance may upset the    
   >    
   > > magnetic properties.   
   >    
   > >   
   >    
   > > For everyone here, transformers they encounter have GOSS or NOSS cores    
   >    
   > > with / without air gaps and tiny amounts of applied DC by meters changes    
   >    
   > > nothing.   
   >    
   > >   
   >    
   > > Your post indicates your shortage of knowledge on the subject. Please    
   >    
   > > expand, and tell us under what circumstances measurements could affect    
   >    
   > > magnetic properties.   
   >    
   >    
   >    
   >    
   >    
   > ** Microphone transformers are  NORMALLY  made with Mumetal laminations -    
   >    
   > which allows the core to be small and the number of turns practical. Fancy    
   >    
   > ones might have amorphous steel in them.   
   >    
   >    
   >    
   > Both materials are  VERY easily magnetised and this immediately changes    
   >    
   > their properties such that primary L drops like a stone. A couple of mA in a    
   >    
   > winding with hundreds of turns is enough in some cases.   
   >    
   >    
   >    
   > Demagnetising the core with low frequency current is easy enough, but beyond    
   >    
   > the resources of the average user.   
   >    
   >    
   >    
   > Tape heads have a similar problem too.   
   >    
   >    
   >    
   >    
   >    
   >    
   >    
   > ....  Phil   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)