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Old 8th June 2012, 12:14 AM   #4001
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Quote:
Originally Posted by dubai2000 View Post
I think it does.

Just finished adding my Altec/Peerless transformers......and I am speechless how much of an improvement i is to any opamp output stage. Very highly recommended - as has been written here before many times....Anyway, thx for the admittedly long but very useful thread!
Hi,
I used the edcor's and notice a big bass and clarity right away I bet a good set of transformers really do sound great!
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Old 8th June 2012, 12:19 AM   #4002
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hi there

i apologize if maybe soumeone else asked this same question but... does this dac work without CS8421 (oversampling circuit) ? on some pics i see jumpers instead of mounted circuit

thanks for your reply
Hi,
I am on another computer and don't have my files, but if I remember correctly,you can unplug that board and it will work ,I think it's in the first part of this thread about that,I'll look when I get home.
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Old 18th June 2012, 04:59 PM   #4003
Ryssen is offline Ryssen  Sweden
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Those of you who have used LL1540 or LL1690 with CS4398,have you done so without series resistors?
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Regards Åke
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Old 19th June 2012, 03:26 AM   #4004
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could somebody help me out on how i would connect jensen je-10kb-c to this board? the trafos leave me with extra set of grounding wires that i have no idea what i should do with- do i just tie them to common ground?

they are the equivalent of JT-10KB-D

i just realized that this is a step down trafo.... don't i need 1:4 for pcm179x chips? this one is 4:1...

Last edited by PreSapian; 19th June 2012 at 03:41 AM.
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Old 19th June 2012, 05:54 AM   #4005
qusp is offline qusp  Australia
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turn it around =) yep I just checked, I dont see why that wouldnt work. connect the shields to the chassis ground/shield connection I would think. so use the output as the input, it shouldnt matter since its designed for balanced input and balanced output and only has a single primary and single secondary

Last edited by qusp; 19th June 2012 at 05:58 AM.
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Old 19th June 2012, 06:40 AM   #4006
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thanks qusp. so i'll just be soldering the 4 extra ground wires to pcb ground and be done with it? i wanna try it without any filters first to see how that sounds like. please stop me if im gonna set something on fire
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Old 19th June 2012, 07:18 AM   #4007
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by 4 extra wires you mean the total for the pair yes? no not signal ground, shield/chassis ground, which should be the same ground, but on the other side of a disconnect network. have you got a chassis ground/shield connection that you have connected cable shields to? the 2 wires per transformer are one for the electrostatic shield and one for the can/case, so just treat them like you would a shield/chassis. if you dont have a chassis ground, then yes you can connect to PCB ground.
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Old 19th June 2012, 08:21 AM   #4008
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thanks qusp. much appreciate it
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Old 19th June 2012, 01:55 PM   #4009
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the trafos i bought used turned out to be defective... no matter which way i connect it i get no sound... i tried capacitor output as a test and took liking to the sound more than i expected so they get to stay

the caps are 10uf epcos motor run caps. genuine oil filled. coming from a 1543 nos dac, the sound is not as organic but the detail on this chip (1798) is unbelievable and it's in no way offensive sounding.

p.s. epcos motor run caps are very very underrated

Last edited by PreSapian; 19th June 2012 at 02:00 PM.
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Old 19th June 2012, 02:03 PM   #4010
qusp is offline qusp  Australia
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PCM1798? you are running them directly? where is the resistor? without any IV resistor and just feeding the current out directly into the tx isnt a recipe for success, neither is just a cap. I had assumed you were running a voltage out dac. this way whatever the next resistance, maybe the DC resistance/impedance of the transformer, or the reflected input impedance of your amp after the tx will be acting as your IV stage, not ideal...
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