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The best sounding I/V resistor

Posted 3rd March 2013 at 10:22 AM by dvb projekt
Updated 3rd March 2013 at 04:17 PM by dvb projekt

As many of you know, i am using the Texas Components TX2575 Bulk Z-Foil resistor for a long time
in important circuit positions, especially as I/V resistor.

Recently i stumbled over a short recommendation from Thorsten Loesch.


Quote:
Originally Posted by ThorstenL View Post
Hi,
I would second Rohpoint, Neohm less. Rohpoint are truely excellent. For my first TDA1541 Non-OS DAC (in 98) I handmade bifilar wound Non-inductive 25 Ohm resistors.
In susequent builds I compared to Rohpoint (which I have used extensively and found no reason to handwind resistors.

In my commercial designs we use a specfic type of SMD resistors after auditioning tons.
Some SMD resistors are really bad, some are so-so and some are most excellent, though no patch for a Rohpoint Squaristor GR102.

Ciao T

Because i know Thorsten as a man who had the perfect sound in mind,
i ordered one pair 30R to try them in my Tube-I-zator.


Click the image to open in full size.

Please note: ROHS compliant parts are now green and the second letter in the part number is 'G'.

Click the image to open in full size.

Thorsten´s post make me very curious. Could this resistor beat the TX2575 in the I/V position?

After one hour of warm up i start listening.
The first few notes from Patricia Barber´s "Companion" XRCD came through my Duo Omega horns and...

...WOW...


I haven´t heard so many coloration from each instrument and voices before.
Also the stage is more 3 dimensional as before and this without loosing the perfect and well known speed and clarity of the TX2575.

However, the Rhopoint Squaristor GG102A is not cheap, but it´s sound quality as I/V resistor is phenomenal.

I am glad that i had try it and could totally second Thorsten´s opinion.

Highly Recommended


Total Comments 13

Comments

  1. Old Comment
    Bas Horneman's Avatar
    Thanks for the tip!
    permalink
    Posted 12th March 2013 at 04:26 PM by Bas Horneman Bas Horneman is offline
  2. Old Comment
    Bas Horneman's Avatar
    Now that you've found the perfect resistor. Don't you think you should solder them in directly into your board"? Since now it is pcb->solder->brass pin or nickel over copper->resistor.
    Then you would have pcb->solder->resistor
    permalink
    Posted 12th March 2013 at 04:29 PM by Bas Horneman Bas Horneman is offline
  3. Old Comment
    dvb projekt's Avatar
    Quote:
    Originally Posted by Bas Horneman View Comment
    Now that you've found the perfect resistor. Don't you think you should solder them in directly into your board"? Since now it is pcb->solder->brass pin or nickel over copper->resistor.
    Then you would have pcb->solder->resistor
    It has a specific reason, why they are still in the pin´s!

    Wait and see...
    permalink
    Posted 18th March 2013 at 06:58 AM by dvb projekt dvb projekt is offline
  4. Old Comment
    Bas Horneman's Avatar
    Ok. Standing by for news!
    permalink
    Posted 27th March 2013 at 04:21 PM by Bas Horneman Bas Horneman is offline
  5. Old Comment
    pinnocchio's Avatar
    It has been 4 months, did you do what you were talking about with the soldering or is it the new Tube-I-Zator 3?

    Thanks
    Do
    permalink
    Posted 13th July 2013 at 02:40 AM by pinnocchio pinnocchio is online now
  6. Old Comment
    dvb projekt's Avatar
    Quote:
    Originally Posted by pinnocchio View Comment
    It has been 4 months, did you do what you were talking about with the soldering or is it the new Tube-I-Zator 3?

    Thanks
    Do
    It was the new Tube-I-zator V3.0, correct!
    permalink
    Posted 13th July 2013 at 06:26 AM by dvb projekt dvb projekt is offline
  7. Old Comment
    wlowes's Avatar

    Optimal value of I/V resistor

    Oliver
    What do you now consider the optimal value of this resistor for I/V in tubizator with one tda and 6np2 tubes. I was thinking 56-68 ohm but want to get this right before ordering $$ parts.
    Walter
    permalink
    Posted 16th July 2013 at 03:33 AM by wlowes wlowes is offline
  8. Old Comment
    dvb projekt's Avatar

    Optimal value of I/V resistor

    Quote:
    Originally Posted by wlowes View Comment
    Oliver
    What do you now consider the optimal value of this resistor for I/V in tubizator with one tda and 6np2 tubes. I was thinking 56-68 ohm but want to get this right before ordering $$ parts.
    Walter
    Hi Walter,

    i would recommend 56R. Get the closest value they offer.

    Cheers,
    Oliver
    permalink
    Posted 16th July 2013 at 07:04 AM by dvb projekt dvb projekt is offline
  9. Old Comment
    wlowes's Avatar
    Thanks for the i/v value tip.

    One more question... I see you use T2575 in the RK position. I know the I/V is critical. Did you see much impact using T2575 here? I have been using Kiwame and will be moving to NOS shintok Tantalum with Red Baron. Did not know if this spot warrants the $$.
    permalink
    Posted 3rd August 2013 at 02:34 PM by wlowes wlowes is offline
  10. Old Comment
    wlowes's Avatar
    For anyone doubting the value of resistor in I/V I can add one more to the many posts. I am working my way thru comparisons. Started with Takman 72R metal film. Can't knock it. Very good sound. Very precise and lots of air. Swapped in Amtrans 53R. Immediately you could tell there was new detail but initially the life was gone. Sounded again mechanical and digital. I let them burn in 10 hrs. Then they sounded promising. Less mechanical and fairly sweet. Much more detail but still some kind of veil... no air. After 50 hrs they were coming into life and sounding very good. Great detail, wide 3d sound stage. At 100 hrs I could love this sound if I did not miss the dark silence and air.
    So in went Caddock TF020 50R immediate improvement with no burn in. I look forward to seeing where we are with 100 hrs.
    I can understand now why these VERY expensive Rohpoint could be worth it. I have ordered manganin wire to make my own using non inductive winding. It will be a while before I get there but thank you Oliver for encouraging us to take these steps. Well worth the expense and the effort!!
    permalink
    Posted 4th August 2013 at 02:28 AM by wlowes wlowes is offline
  11. Old Comment
    dvb projekt's Avatar
    Quote:
    Originally Posted by wlowes View Comment
    Thanks for the i/v value tip.

    One more question... I see you use T2575 in the RK position. I know the I/V is critical. Did you see much impact using T2575 here? I have been using Kiwame and will be moving to NOS shintok Tantalum with Red Baron. Did not know if this spot warrants the $$.
    I didn´t make any comparisons for the Rk position. What i had in mind is to use the resistor with lowest noise.

    If you would like to compare, it would be great if you share your findings.

    Best regards,
    Oliver

    permalink
    Posted 5th August 2013 at 11:49 AM by dvb projekt dvb projekt is offline
  12. Old Comment
    Hi where can I buy thoose Rhopoint resistors ?

    Thank You
    permalink
    Posted 30th October 2013 at 10:59 PM by Erlend Sæterdal Erlend Sæterdal is offline
  13. Old Comment
    dvb projekt's Avatar
    Quote:
    Originally Posted by Erlend Sæterdal View Comment
    Hi where can I buy thoose Rhopoint resistors ?

    Thank You
    You could order them direct at Rhopoint.

    permalink
    Posted 31st October 2013 at 07:07 AM by dvb projekt dvb projekt is offline
 
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