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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: Question on 'source impedance'. posted by Story on October 23, 2002 at 13:41:28:
It's very confusing. My interpretation of the specs is that the
value == Zin Primary when the secondary windings are left unloaded.As an example, the LL1660/10mA in Alt S (1:1.125 SE-SE) has a
Zin of 14k. This would compel me to use a tube that has an Rp
less than this value. I'd use a tube with Rp = 1/2Zin or 1/3Zin.
In other words, something like a 8532W with Rp=4400 ohms or paralleled 6N1P sections.If you use the LL1660/10mA in other modes - i.e. 1:2.225. Zin=3.5K.
In this case, I'd be tempted to use a 5842 tube with Rp=1100 or
a 6C45 with an Rp of 900 ohms.If you load the primaries (i.e. class A2), you need to account
for the load impedance reflected back into the primary.I'm waiting to pickup a real oscilloscope (not my sound card scope)
and a function generator - so I can actually see what I am doing.
Edits: 11/02/20 11/02/20 11/02/20 11/02/20 11/03/20 11/03/20 11/03/20 11/03/20
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Follow Ups
- Re: Question on 'source impedance'. - Jim Doyle 22:33:15 10/23/02 (1)
- Re: Question on 'source impedance'. - KevinC 04:45:04 10/24/02 (0)
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