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Old 7th January 2008, 09:52 AM   #1
wonsup is offline wonsup  United States
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Default Help with wiring a Hammond Power Transformer

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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Old 7th January 2008, 10:56 AM   #2
dhaen is offline dhaen  Europe
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Old 7th January 2008, 11:04 AM   #3
Colt45 is offline Colt45  Serbia
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either, and definitely not both.
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Old 7th January 2008, 01:07 PM   #4
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Use pin 8. That way you can plug in a 5AR4 if you ever want to.
Tubelab, it's 5 year mission. To explore strange new tubes, to seek out new circuits and topologies, to boldly go where no tube has gone before......
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