| A3rd.Zero |
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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| Sch3mat1c |
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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| A3rd.Zero |
Sweet. Thank you very much. I had thought for a moment that I had screwed the pooch big time.
Milo |
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| A3rd.Zero |
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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| SY |
| 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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| A3rd.Zero |
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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| SY |
| In most cases, just leave it alone. |
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| A3rd.Zero |
Thank you Sch3mat1c
Thank you SY
I think I can build my amp now. mmmmmmmm, tube amp :P
milo |
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| s2kov |
| 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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| cogsncogs |
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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| s2kov |
| quote: | Originally posted by s2kov
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....
:) :) :) |
Thanks wayne....
:) :) :) |
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| s2kov |
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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| s2kov |
Anyone????
| quote: | Originally posted by s2kov
Thanks wayne....
:) :) :) |
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| Sch3mat1c |
Each heater half uses 6.3V at .15A. Add it up.
Tim |
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| s2kov |
Thanks Tim.
Appreciate your help....
| quote: | Originally posted by s2kov
Anyone????
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