"TX2575 Naked Foil Resistors"

[Audiocom AV]

Hello

We are in the process of evaluating the range of TX2575 Naked Foil resistors from Texas Instruments to use in our modifications. It uses the top-secret Z foil provided by Vishay, Israel. Resistors made Z foil cost four times more than the naked C/K foil TX2352 resistors.

The datasheet of the TX2575 can be viewed here;

http://www.texascomponents.com/pdf/tx2575.pdf

The TX2575 could be the closest to the perfect resistor. Has anybody had experience with the TX2575 or similar? I would be interested to hear you comments on sound quality.

Best Regards
Mark Bartlett

[Dave Cawley]

What is the substrate? Are they really Texas Instruments ?? They look similar to http://uk.rs-online.com/web/search/s...duct&R=2391948 and they are good.

Dave

[Audiocom AV]

What is the substrate? Are they really Texas Instruments ?? They look similar to http://uk.rs-online.com/web/search/s...duct&R=2391948 and they are good.

Dave

Hello Dave

The substrate is a Z-Foil (bulk metal foil), there are C, K & Z types, the Z-foil is the highest grade. The link to the RS part is a thick film resistor, quite different to thin film or bulk metal foil. My experience with thick film is that they are poor for audio, too noisy.

Best Regards
Mark Bartlett

[Mike]

More here: http://www.vishay.com/docs/63113/z201.pdf

[Audiocom AV]

More here: http://www.vishay.com/docs/63113/z201.pdf

Thanks Mike

One point, the Z201 is with the plastic insulator, the TX2575 is naked; no plastic or dipped ceramic insulator.

All the Best
Mark Bartlett

[Dave Cawley]

The Vishay ones look good. But were those Texas Instruments?? Thick film, Thin Film ? Can you explain ?

Dave

[leo]

Never tried these but a I have read reports that they are good, only thing is they are quite delicate.
Would be interesting to try these in a I/V stage, maybe something to try in my TDA1541S2 dac sometime, I currently use nude Caddocks.

[Audiocom AV]

The Vishay ones look good. But were those Texas Instruments?? Thick film, Thin Film ? Can you explain ?

Dave

Hello Dave

Texas Components Corporation is franchised by Vishay to complete the manufacturing process on resistors using Vishay bulk metal foil resistive elements purchased from Holon, Israel.

There is an excellent page here which explains the differences between thick film, thin film, foil resistors; scroll down;http://en.wikipedia.org/wiki/Resistor

Best Regards,
Mark Bartlett

[Mike]

They seem to be very accurate and very quiet. Think I'd like to try them in a phono stage.

[Audiocom AV]

Never tried these but a I have read reports that they are good, only thing is they are quite delicate.
Would be interesting to try these in a I/V stage, maybe something to try in my TDA1541S2 dac sometime, I currently use nude Caddocks.

Hi Leo

The TX2575 could well be the best solution for a passive I/V stage. Over the next few weeks I am going to be evaluating the TX2575 in a Sony DAS-R1 using a pair of TDA1541A S2 DAC's, I will report back.

What is the part # of the nude Caddock resistors you are using?

Best Regards,
Mark Bartlett