K&K Audio / Lundahl Transformers

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RE: The Eagle has landed, new tt ps kit has finally arrived!

Posted by KevinC on August 2, 2014 at 08:28:21:
No, he has no more of the info you asked for than I do. I generally design my products to meet functional and sonic needs, then make the measurements for those who need them to judge suitability to their needs.

As you surmise, the oscillator is analog. The THD is very low (<0.01%), but I have no equipment with which to make more sophisticated measurements. When I get onto making the manuals for these, I will also make the frequency adjust measurements, etc. The range is not suitable to accommodate 45rpm playback by running the motor on an 81Hz signal. I'm of the opinion after reading the motor literature that the motor was designed to run at 50 or 60Hz and should be run at that frequency for best performance. A dual pulley solves the speed change need in a simple, if not ultimately "pushbutton", way.