ampage
Tube Amps / Music Electronics
For current discussions, please visit Music Electronics Forum. New: view Recent Searches.
New: visit Schematic Hell!
The sunn still shines online!

 
Listen to great tunes streaming live right now!

ampage archive

Vintage threads from the first ten years

Search for:  Mode:  

Center tap fil winding for rect.


 
4/30/1998 8:15 AM
rjh
Center tap fil winding for rect.
Ok I'm real new to this.  
 
This is my first project, I'm currently wiring the filiments, my power trans (hammond), has a center taped fil winding for the 5v tube rect. Do I(1) use this somewhere? or do I (2) only use the outsides, and grnd the ctr tap, or (3) use the outsides and tape off the ctr tap as no contact? I'm going to use a 5u4 as the rect.  
 
Thanks
 
4/30/1998 1:31 PM
Ben
You would probabbly want to go with your third option. Connect the 5VAC wires to your 5U4 tube, and then just tape the center tap off.  
The only time I can think to use the center tap is if you want to use it for 2.5V filaments such as a 2A3 or others....  
 
Ben
 
4/30/1998 1:34 PM
Doc

Ignore that center tap, just tape the end and tuck out of the way. It's used in some applications with antique directly heated filament tubes requiring a 5-volt supply. They use the center tap with a cathode resistor for minimum hum.  
 
Just use the two outer leads and connect to pins 2 & 8 of the 5U4 socket.
 
5/1/1998 7:30 AM
RJH
Thanks for the help!!!  
 
I'm sure I'll need more as this thing comes together!
 
   Page 1 of 1