K&K Audio / Lundahl Transformers

RE: Optimizing LL9206 for Kontrapunkt B cart.

69.108.89.97

In Reply to: RE: Optimizing LL9206 for Kontrapunkt B cart. posted by joshnich on October 12, 2009 at 16:09:15

The LL9206 can be a 1:10 step up transformer. (Termination Alternative C)
That would give you 4.7mv....good.
The impedance ratio is the square of the turns (voltage) ratio.
So, with a impedance ratio of 1:100, the 47K input resistance of your phono preamp will look like 470 ohms to the cartridge. Too high.
If you parallel the 47K input resistance with a 13K resistor that will give 10183 ohms so the cartridge will see 101.83 ohms.
If you parallel the 47k input resistance with a 6K resistor that will give 5320 ohms so the cartridge will see 53.2 ohms.
Tre'

Have Fun and Enjoy the Music
"Still Working the Problem"
http://www.lundahl.se/pdfs/datash/9206.pdf (Open in New Window)

Edits: 10/15/09

Follow Ups:

RE: Optimizing LL9206 for Kontrapunkt B cart. - joshnich 17:40:14 10/18/09 (1)
- Take a look at this - tuneful 18:22:03 10/18/09 (0)

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