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K&K Audio / Lundahl Transformers Welcome! Need support, you got it. Or share youe ideas and experiences. |
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K&K Audio / Lundahl Transformers Welcome! Need support, you got it. Or share youe ideas and experiences. |
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In Reply to: Re: Grid resistors would ruin the source impedance? (nt) posted by Tre' on September 1, 2003 at 10:03:27:
Kevin, I'm not trying to confuse you. Thanks for your patience.
Using the example of the K&K Audio P-P Amp Input Circuit
http://hometown.aol.com/kevinc927/images/PPAmpInput.pdf
The first stage has 25k grid resistors.
Two things about this first stage.
Is there 50k reflected back to the rca input through the LL1676 input transformer?
Does there need to be grid resistors?
If there were no grid resistors what would be the input impedance at the rca jack?
Since there are grid resistors, does the center tap need to be grounded and if so why?I also have questions about the LL1660s/PP in this circuit.
If there are no grid resistors on the output tubes that this transformer is driving, what is the load for the 6bx7's?
And if there are grid resistors on the output tubes, does the LL1660s/PP center tap need to be grounded?As for the question about leaving the center tap ungrounded and having grid resistors, I was trying to answer my own question and thinking that the source impedance would be higher if the center tap was left ungrounded.
I hope this helps and doesn't make it more confusing. I'm trying to look up these questions on my own as well.
Thanks........Tre'
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Follow Ups
- Re: Grid resistors would ruin the source impedance? (nt) - Tre' 12:06:13 09/01/03 (2)
- Re: Grid resistors would ruin the source impedance? - KevinC 12:49:33 09/01/03 (1)
- Thanks Kevin, I think I've got it now (nt) - Tre' 13:36:42 09/01/03 (0)
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