From: not.here@invalid.invalid   
      
   On Tue, 09 Nov 2010 15:03:33 -0500, Phil_S wrote:   
      
      
   >   
   > I've got a PT that's 280-0-280 @ 40mA and 12.6vct @ 1.5A.  You think   
   > this is useful?  I'm not quite sure how to deal with the 12.6v filament   
   > supply.  Two 6.3v tubes in series and one 12v tube in parallel to that?   
   > Can I do that? I had bought this originally for the concept of an all   
   > 12V tube amp, probably  12AX7 + 12AU7, but didn't get to it just yet.   
   >   
   > I've also got one that's 114-114 (no CT) and It seems to have held up to   
   > testing at 85mA.  The 6.3v winding capacity is unknown, but I imagine it   
   > can handle 1.05A, which is what's needed for a 6AQ5 + two 12AX7's.   
   >   
   > Anyhow, getting a PT is not a challenge.  Low mA/ low VA types pop up on   
   > eBay cheap every day -- and easier than trying all that back to back   
   > stuff.   
   >   
      
      
   Just to but in with something that may be of interest regarding heaters   
   following the Mullard/Philips designations:   
      
   Type numbers Exxxx with 6.3v heaters have variable current (but you knew   
   that!). They are intended for parallel connection.   
      
   Type numbers Uxxxx all draw 100mA and have variable voltage and are   
   intended for serial connection. Many of them also have quite high h-k   
   breakdown voltage just because of this.   
      
   Type numbers Pxxxx all draw 300mA - once again for serial connection.   
      
   More here:  http://en.wikipedia.org/wiki/Mullard-Philips_tube_designation   
      
      
      
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   Mick                      (Working in a M$-free zone!)   
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