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
Thanks
Milo
Tie pins 4 & 5 together, connect 6.3V across pins 4+5 and 9. Just connecting both halves in parallel.
Tim
Tim
Sweet. Thank you very much. I had thought for a moment that I had screwed the pooch big time.
Milo
Milo
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
I am sorry if I'm beting an idiot, Im still getting the hang of this stuff.
Thanks for your help.
Milo
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.
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
Milo
Sch3mat1c said:
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....
🙂 🙂 🙂
Heater Current
Guys,
In addition to my previous question, assuming i use to two (2) 12au7 and both halves connected in parallel. What is the required current for the transformer? Is it 0.6A for two twin triode?
Thanks....
Guys,
In addition to my previous question, assuming i use to two (2) 12au7 and both halves connected in parallel. What is the required current for the transformer? Is it 0.6A for two twin triode?
Thanks....
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