Adding Jensen Transformers to ULN-2
Old 8th February 2013
  #1
Gear Head
 

Thread Starter
Adding Jensen Transformers to ULN-2

Has anyone added Jensen transformers to a ULN2? It seems like it would be pretty straight forward if you know electronics.

They charge 800 for the upgrade. Am I missing something? Anyone know what Jensen transformers are best for the ULN-s? I have seen certain ones sell for $40 on ebay...
Old 4th October 2013
  #2
Gear addict
 

same question here. Anyone?
Old 4th October 2013
  #3
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drtechno's Avatar
 

the $800 is for the changes of the analog board- adding two transformers by gluing them down with sillicone.

yea it has to be the sillicone.

but it still has crappy surface-mount components in the line stage so its a 40% improvement at the most.
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Old 4th October 2013
  #4
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drtechno's Avatar
 

and yes its pretty strait forward too Just a 1:1 at the input impedance rating should get you in the correct direction.

and be sure to use some nice clear non water-based, stinky RTV sillicone. coat the exposed pads after soldering, let dry for a day or two, and glob some more to glue the transformer in place. let set for four days before moving or using it.
Old 5th October 2013
  #5
Gear addict
 

how would you describe the difference in sound? is it worth the upgrade?
Old 6th October 2013
  #6
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drtechno's Avatar
 

putting transformers on the adc helps if the connection going to it is not a perfect balanced circuit. dc offset is eliminated. and there is a little bit of square wave modification that is simular to what happens to the square wave when it hits a tape head. also the harmonics can be much more pleasing. but I mod adc's with carnhills because of there harmonic character is more pleasing to me in a/b them (vs jenson offerings)

It is finding good sounding surface mount passive componates is the hard part.

Manufacturers went too cheap because it cost less to have a board stuffed with surface mount compared to pin and hole. Unfortunately, the end product suffers because of this.
Old 22nd November 2013
  #7
Gear Head
 
MoTech's Avatar
 

Does anybody got any AB examples with Jensen vs none?

I'm still being tempted to add the Jensens, but not sure it's worth such a huge dosh...
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