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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: LL1670 as a step-up transformer. posted by KevinC on December 7, 2004 at 05:53:00:
Hi Kevin,
I tried the LL1670 in stepup mode in above arrangement using type76 valve with & without 400k grid leak.
What I found was peculair to say the least there was no DC offset being applied to LL1670 simply audio test tones in range of 200mv to 2v from 20-20khz.Everything looked fine monitoring input & output signal across LL1670 till around 8Khz then everything took a great duckdive regarding signal amplitude & symmetry in fact it began looking like a distorted stepdown.
I removed the type76 & ran test across LL1670 on its lonesome & experienced the same results. I'm confused regarding this outcome I tried other signal sources wth low generator Z & witnessed the same.
Measurments made with a X10 probe on CRO.
Could this be caused by a lack of balance between CT & ends of transformer. In theory when the ratio is 1:2 or 2:1 the currents in the two section should be the same. The RDH has a bit to say about autotransformers describes this approach as a "economical - can be used in some cases"
Regards,
Johno,
Oz.
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Follow Ups
- Re: LL1670 as a step-up transformer. - Johno 01:52:37 12/09/04 (0)
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