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Old 18th March 2004, 05:46 AM   #1
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Default Wiring a 12au7

I am using a 12au7 in a preamp and I have questions about wiring it to the 6.3volt supply. I have heard that you can use a 12au7 on a 6.3volt supply somewhere but I cant figure it out. Unfortunatly I only have one 6.3volt winding on my transformer so I may be out of luck. Can anyone tell me how to do this?

Thanks

Milo
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Old 18th March 2004, 06:51 AM   #2
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Tie pins 4 & 5 together, connect 6.3V across pins 4+5 and 9. Just connecting both halves in parallel.

Tim
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Old 18th March 2004, 02:44 PM   #3
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Sweet. Thank you very much. I had thought for a moment that I had screwed the pooch big time.

Milo
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Old 19th March 2004, 06:45 PM   #4
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Hang on. Isn't that the way you would wire any tube that takes 6.3V to a 6.3V supply (Ie a 6Dj8)? The 12Au7 is a 12.6V tube though.

I am sorry if I'm beting an idiot, Im still getting the hang of this stuff.

Thanks for your help.

Milo
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Old 19th March 2004, 07:06 PM   #5
SY is offline SY  United States
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Milo, no, you hook up a 6DJ8 by running 6.3 v between pins 4 and 5. They're not tied together in that case. Pin 9 in that family isn't a heater center-tap, it's usually a shield.
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Old 19th March 2004, 07:18 PM   #6
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So what should I do with the 9pin on a 6DJ8 tube? leave it alone or ground it? Thanks for your help, I really appreciate it.


Milo
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Old 19th March 2004, 07:35 PM   #7
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In most cases, just leave it alone.
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Old 19th March 2004, 07:44 PM   #8
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Thank you Sch3mat1c

Thank you SY

I think I can build my amp now. mmmmmmmm, tube amp :P


milo
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Old 29th March 2004, 11:15 AM   #9
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Quote:
Originally posted by Sch3mat1c
Tie pins 4 & 5 together, connect 6.3V across pins 4+5 and 9. Just connecting both halves in parallel.

Tim

How about connecting both halves in parallel if you have 6.3V Center Tapped (3.25-0-3.25)? Where do you think i can connect Pin 9?

Thanks....

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Old 29th March 2004, 01:25 PM   #10
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Default pin 9?

s2Kov,

Quote:
How about connecting both halves in parallel if you have 6.3V Center Tapped (3.25-0-3.25)? Where do you think i can connect Pin 9?
Like this.

Wayne
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