Experiments with VTF


I've spent the last couple of days experimenting and optimizing the VTF of my cartridge. I wanted to share my obervations. Hopefully this will provide some inspiration to newbies to experiment with this adjustment.

Initially, instead of making very small (~0.01 g) incremental changes, try making some large changes (~0.1 g) in each direction to get an appreciation for the effect VTF has on sound reproduction.

What I found when below optimum is that the sound is very airy (too much depth from the lack of bass), although lean and slightly tinnier in timbre and with lower bass response. You will notice this as you will have greater presence of midrange and highs and less bass.

When above optimum, the airiness decreases, the sound becomes richer in timbre but too thick, with improved bass but slightly less defined and resonant. You will notice this most from a thick, minimally airy (less defined depth)sound.

I would recommend approaching the optimum using 0.05 g increments from a setting that is too low. As you approach optimum, you will find bass to improve and timbre to become more correct and natural and the ariness to lessen but still be there.

When you get close, begin to make 0.01 g increments till you find the perfect balance between airiness/soundstage, dynamics, natural timbre and bass presence and definition.

It is a long and painstaking process but very rewarding. It is amazing just how much 0.01 g can make when you get close.

I would recommend a record that has female vocals, some good bass and lot's of ambience. I mainly used Norah Jones-Come away with me.

With my transfiguration Orpheus, I found the optimum to be around 1.955 - 1.960 g.

Good luck and have fun
aoliviero
for the heating bulb, you should get started right away by increasing the voltage by .1v, allowing for thermal stabilisation, I'll hope to hear from you guys in a couple of years :-)
Sorry, it was irresistable
I want to add my experiences of the last week where I can confirm that differences of .05 gm make a valid, repeatable difference. I was not able to repeat anything lighter. I checked alignment before and after the adjustment process and it was spot on. The difference from where I started and ended was .2gm lighter than recommended
in doing this I was able to lower vta to where the sra should theoretically be correct and the overall results were very satisfying.
my .02 (gm!)
For the record, it would take a 1,000W bulb to keep most cartridges warm in Ndoshi's listening room.

I presume that's why he uses a Koetsu. ;-)