K&K Audio / Lundahl Transformers

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K&K Audio / Lundahl Transformers

TVC driver possibly 1544 or 1676

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I want to drive my Sowter transformer volume control from a parafed device. The TVC is low on inductance and so is difficult to drive directly off the 5687 anode as the cap value would be very large.
I would like to be able to ring a few changes, so I could choose 1:1, or 2:1 stepdown (probably the mode I will use) or even 4:1 stepdown.
What transformer would be recommended. On the face of it the 1544 would seem appropriate as the spec sheet says it will do 10K to 2.5K as a 2:1 stepdown.
Is there a better option?
Andy

Follow Ups:

Re: TVC driver possibly 1544 or 1676 - KevinC 11:00:10 05/19/05 (2)
The LL1544A will work. I have used it thus, although only 4:1. It is limited to about 2vRMS at 20Hz, though. For more output use the LL1674, which is what I use in the Art Audio Vinyl Reference as the parafeed output at 4:1 with a CCS loaded 6N1P doing the honors.
Kevin Carter
K&K Audio
www.kandkaudio.com
- Re: TVC driver possibly 1544 or 1676 - Stephen R 07:59:41 05/20/05 (1)
  I'm a little confused by the 1676 vs 1674. If you were to use either connected at 4:1, why would you choose the 1674 over the 1676?
  - Re: TVC driver possibly 1544 or 1676 - KevinC 09:56:38 05/25/05 (0)
    In general, it is better to leave secondaries in series, thereby minimizing stray shunt capacitance, so although the ranges of ratios overlap, choose the one that provides the ratio that you need.
    
    Kevin Carter
    K&K Audio
    www.kandkaudio.com

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