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#1 |
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diyAudio Member
Join Date: Nov 2007
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Hi (newbie alert. did search),
I am trying to put togeter an Aikido headphone amp, and I am having a bit of trouble trying to wire up a Hammond 270FX transformer with a 5U4G rectifer tube. All the power transformers that I've used before (272FX) had center tap on the 5V filament wires. I always took the B+ volatage out of that line (that is how I was taught). Like this: Hammond / 5U4G Tube Red wire (300v)- Pin 4 Red wire (300v)- Pin 6 Yellow wire (5v)- Pin 2 Yellow wire (5v)- Pin 8 Yellow/black wire (CT of 5V) - B+ But the 270FX that I just bought does not have a center tap for the 5V filament wires. Where do I take the B+ from? Do I wire like this? Red - Pin 4 Red - Pin 6 Yel - Pin 2 Yel - Pin 8 And take B+ from EITHER Pin 2 or Pin 8? Or do I take if from BOTH Pin 2 and 8? |
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#2 |
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diyAudio Moderator Emeritus
Join Date: Jun 2002
Location: U.K.
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Either
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#3 |
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diyAudio Member
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either, and definitely not both.
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#4 |
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diyAudio Member
Join Date: Jul 2005
Location: South Florida
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Use pin 8. That way you can plug in a 5AR4 if you ever want to.
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