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In the Forum: Analog Playback
In the Thread: The Expressive Technologies SU-1
Post Subject: Secondary vs.primaryPosted by Romy the Cat on: 7/24/2009
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 Axel wrote:
OK, this is useful also, in that you have not noted a "pattern" as you say. My point is closer to your suggestion, that I do change cart --- and sometimes buy new ones,  B U T I do not buy other SUT (at least I try to avoid it). I'm currently waiting for the return of my new Ortofon Windfeld (the old one developed a problem with wrong VTA of cantilever) so they give me a new one after MUCH waiting time. (I rings a bell with what your Jubilee did, as did my previous Jubilee!!! also exchange because of split open body).
So, I'm getting ready to hock up the new (I hope now correctly working one) with my FR XF-1 type M SUT. With that messed up Windfeld (riding almost on the bottom) I found that primary loading sounded best and 10ohm! Maybe the new one will be happy with it also, but maybe not - I will see. Using primary loading is more 'uncomfortable' because of the resistors having to be soldered into the primary side of the trannie ---- and getting good resistors is also a pain (I use Shinkoh Tantalum, other R sounds crap as you'd call it).
 
I am not big fun of using resistor on primary. There is something non kosher in it, even the resistor is properly recalculated from secondary to primary. It is not to mention that in your loading assessment the cable after the second is not involved. Even if you have 3 inch cable after the transformer than with 1:25 ratio the coil of your cartridge would see almost 3 feet of cable… Also, I do feel that loading of primary and loading of secondary affects loading differently and damps the coil differently.  Some transforms makes offer separate options for loading of primary and secondary, the Kondo transformers for instance. I played twice with this transformer and one time I change the load but it was only secondary. I have in a past a very prolog debate with Kondo transformer owned who swear to me that primary loading affect sound differently then secondary. I do not argue it and would concur it. However, when I was asking his what type of Practical Sonic Impact he is able to inflict with primary loading that he is not able to inflict with secondary loading he really was not able to come up with any sensible description.
 
I use Vishay 102S and RN60 for loading and load only on secondary and at extreme proximity to the grid of the input tube. I do not change loading in fly as I was not able to find a transparent enough switching for this level of currents. I kind of do not need a lot of play with it as I for all of my 3 phonostages (2 actively use now) respectively use the same dedicated topology of cartridges that more or less have the same loading. For instance when I moved from Shelter 901 to Otofone Jubilee I did not feel any need to change my loading and it is not loaded to 36K RN60 on secondary right at the input tube’s leg
 
The Cat
 

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