pietjers said:
For vaues in the mid of the range, you can expect about 7-8 USD /each. 1% tol. Lowest and highest values cost more.
You can get 0.1% tol for about 10 cent extra/each.
You do not have to buy without getting a price first. Just ask how much each value cost and they will give you a qoutation.
They are very nice people to deal with!
Sigurd
Thank you Sigurd! I suppose the price you mentioned is for TX2352 resistors. Any idea about the price of TX2575?
A have a question for those who have listening experiences with resistor directionality. Is it possible, like with foil capacitors where the outer foil should be connected to the signal source (=> to lowest impedance) for best results, to predict in what direction a particular resistor should be used? This would only be possible in a production process where the color coding or value text is applied before the resistors end-up together with the rest of the batch. That brings me to the next interesting point: when the value coding is applied afterwards (who can say for sure), how can one examine the direction anyway? When one of the resistors is in the opposite direction and you turn both for a second listening test this situation remains the same. The nude Texas resistors, some of the Caddocs and Vishays are an exception of this I think, because they have a clear left and right side.
Peter
A have a question for those who have listening experiences with resistor directionality. Is it possible, like with foil capacitors where the outer foil should be connected to the signal source (=> to lowest impedance) for best results, to predict in what direction a particular resistor should be used? This would only be possible in a production process where the color coding or value text is applied before the resistors end-up together with the rest of the batch. That brings me to the next interesting point: when the value coding is applied afterwards (who can say for sure), how can one examine the direction anyway? When one of the resistors is in the opposite direction and you turn both for a second listening test this situation remains the same. The nude Texas resistors, some of the Caddocs and Vishays are an exception of this I think, because they have a clear left and right side.
Peter
Mcintosh MC240 resistors replacement
Hi,
can FoilEngineer or somebody else give me some advise on which resistors to change on an MC-240. I can send the schematics but a general orientation would help.
There are at least 50 resistors most of the .5 watt, a few 1 watt and two 2 watts.
Are VAR available for this values?
Where I can buy them?
Thanks
fthifi
Fernando
Hi,
can FoilEngineer or somebody else give me some advise on which resistors to change on an MC-240. I can send the schematics but a general orientation would help.
There are at least 50 resistors most of the .5 watt, a few 1 watt and two 2 watts.
Are VAR available for this values?
Where I can buy them?
Thanks
fthifi
Fernando
VAR is excellent (maybe the best) but also expensive. RN60 is much, much cheaper. It all depends on the quality of the other parts of your Mac. These resistors are less than or around 1 W. If you need more, consider Mills, but the then maximum resistance is limited. The datasheets are available at the manufacturers' website.
Ciao oshifis,
Texas components sells the Zfoil in the USA. They quote me the following prices:
TX2352 1.0% TX2575 0.1%
R1 250 K 33.28 TX2575-3 56.19
R2 250 K 33.28 TX2575-3 56.19
R3 250 K 33.28 TX2575-3 56.19
R4 200 K 21.18 TX2575-2 43.22
R5 200 K 21.18 TX2575-2 43.22
R6 100 K 13.91 18.79
R7A 100 K 13.91 18.79
R8 100 K 13.91 18.79
R7B 100 K 13.91 18.79
R9 1 M TX2352-4 153.09 No Bid
R10 10 K 6.95 9.40
R11 2.2 K 6.95 9.40
R12 3.3 K 6.95 9.40
R13 68 6.95 9.40
R14 100 K 13.91 18.79
R15 2.2 M No Bid No Bid
R16 18 K 1 W TX2352-2 15.99 TX2575-2 21.62
R17 27 K 1 W TX2352-2 15.99 TX2575-2 21.62
R18 30 K 1 W TX2352-2 15.99 TX2575-2 21.62
R19 2.2 M No Bid No Bid
R20 2.2 M No Bid No Bid
R21 220 K 33.28 TX2575-3 54.03
R22 220 K 33.28 TX2575-3 54.03
R23 2.7 K 1 W TX2352-2 15.99 TX2575-2 21.62
R24 12 K 2 W TX2352-4 31.97 TX2575-4 43.24
R25 1 M TX2352-4 153.09 No Bid
R26 1 M TX2352-4 153.09 No Bid
R27 12 K 2 W TX2352-4 31.97 TX2575-4 43.24
R28 56 K 10.43 14.10
R29 56 K 10.43 14.10
R30 56 K 10.43 14.10
R31 56 K 10.43 14.10
The number that follows the dash (-) represents the number of resistive elements.
Quite expensive as you can see.
The problem with the TX2575 Zfoil is that I need them to be .5 watts and they are .4 watt at 70 celsius.
I wonder if I can use the .4 watt since the Mcintosh MC240 asks for .5?
Texas components sells the Zfoil in the USA. They quote me the following prices:
TX2352 1.0% TX2575 0.1%
R1 250 K 33.28 TX2575-3 56.19
R2 250 K 33.28 TX2575-3 56.19
R3 250 K 33.28 TX2575-3 56.19
R4 200 K 21.18 TX2575-2 43.22
R5 200 K 21.18 TX2575-2 43.22
R6 100 K 13.91 18.79
R7A 100 K 13.91 18.79
R8 100 K 13.91 18.79
R7B 100 K 13.91 18.79
R9 1 M TX2352-4 153.09 No Bid
R10 10 K 6.95 9.40
R11 2.2 K 6.95 9.40
R12 3.3 K 6.95 9.40
R13 68 6.95 9.40
R14 100 K 13.91 18.79
R15 2.2 M No Bid No Bid
R16 18 K 1 W TX2352-2 15.99 TX2575-2 21.62
R17 27 K 1 W TX2352-2 15.99 TX2575-2 21.62
R18 30 K 1 W TX2352-2 15.99 TX2575-2 21.62
R19 2.2 M No Bid No Bid
R20 2.2 M No Bid No Bid
R21 220 K 33.28 TX2575-3 54.03
R22 220 K 33.28 TX2575-3 54.03
R23 2.7 K 1 W TX2352-2 15.99 TX2575-2 21.62
R24 12 K 2 W TX2352-4 31.97 TX2575-4 43.24
R25 1 M TX2352-4 153.09 No Bid
R26 1 M TX2352-4 153.09 No Bid
R27 12 K 2 W TX2352-4 31.97 TX2575-4 43.24
R28 56 K 10.43 14.10
R29 56 K 10.43 14.10
R30 56 K 10.43 14.10
R31 56 K 10.43 14.10
The number that follows the dash (-) represents the number of resistive elements.
Quite expensive as you can see.
The problem with the TX2575 Zfoil is that I need them to be .5 watts and they are .4 watt at 70 celsius.
I wonder if I can use the .4 watt since the Mcintosh MC240 asks for .5?
In most cases the wattage ratings are conservative and you just may get away with 0.4 instead of 0.5 watts. However, the best way would be to calculate the actual dissipation per resistor. This requires that you can derive the voltages/currents from the schematics or that you measure the actual voltages across each resistor, very carefully and without slipping the probes.
Apart from that not all resistors are equally important, so you may not necessarily need to change them all. Again, this is somewhat subjective and requires that you look at the crcuit diagram.
I've used the Holco's for many years and I observe that the construction is largely the same, just with the ferrous end-caps to mitigate the problems with the delicate lead attachment (some users weren't gripping the leads close to the body when bending, resulting in damaged leads). AFAIK, the leads themselves are still copper.
They are still a fine resistor with very tight specs, and I'd rate them as superior to the Roderstein "Resista", but for signal path use I prefer the smoother-sounding Riken Ohms in my system.
BTW- According to an article I read, the name "Holco" is derived from the words "Whole and Copper", originally used to describe the construction.
-Joe
They are still a fine resistor with very tight specs, and I'd rate them as superior to the Roderstein "Resista", but for signal path use I prefer the smoother-sounding Riken Ohms in my system.
BTW- According to an article I read, the name "Holco" is derived from the words "Whole and Copper", originally used to describe the construction.
-Joe
jtsaudio said:
Hi,
Not that it matters much, but I have seen this same misunderstanding before on this Forum.
In fact " HOLCO" is derived from the name of the company making these resistors. i.e. HOLsworthy COmpany, as they were originally called, and they are (or were) located in Holsworthy, Devon, in the UK.
Some years ago, I visited their manufacturing establishment in Holsworthy several times, but they are now part of a larger electronics organisation nowadays.
Regards,
Hi Sigurd
Thanks for reply. Percy Audio also never reply my email. i have email then last march, no reply. email them again this august and no reply as i know they carry vishay s102.
hence i source from part connexion but they dont have vishay
mind pm me or post the email you use to communicate with them? as the email i got from the catalog never has answer. thx
Thanks for reply. Percy Audio also never reply my email. i have email then last march, no reply. email them again this august and no reply as i know they carry vishay s102.
hence i source from part connexion but they dont have vishay
mind pm me or post the email you use to communicate with them? as the email i got from the catalog never has answer. thx
To pietjers:
z-foil resistors are non-directional.
They have foil applied to both sides of ceramic substrate, and therefore any directionality is cancelled by bonding left side of the upper resistor foil to the right side of the lower resistor foil. Main reason for this design change is decreasing "PTC" coefficient. (Power temp. coefficient, similar to TC but "PTC" is resistance change due to self-heating, while TC is due to environment temperature).
Additional benefit is lower inductance because current flows through thicker conductor (well only a fraction of a nH).
z-foil resistors are non-directional.
They have foil applied to both sides of ceramic substrate, and therefore any directionality is cancelled by bonding left side of the upper resistor foil to the right side of the lower resistor foil. Main reason for this design change is decreasing "PTC" coefficient. (Power temp. coefficient, similar to TC but "PTC" is resistance change due to self-heating, while TC is due to environment temperature).
Additional benefit is lower inductance because current flows through thicker conductor (well only a fraction of a nH).
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