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Shunt Potentiometer : Help needed
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both option 1 and 2 would work, but option-1 will give reversed rotation ( turn knob clock-wise --> sound level gets lower).
go "blue-ink" .
34k input resistor value is a bit high. The volume pot in 002 is 10k, I like to do 50~70% pot value for input resistor value (so loudness at 12 o'clock is about the same as a normal pot).
go "blue-ink" .
34k input resistor value is a bit high. The volume pot in 002 is 10k, I like to do 50~70% pot value for input resistor value (so loudness at 12 o'clock is about the same as a normal pot).
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huh, I somehow just didn't see the 252 part, kept thinking 002. sorry.
I am re-testing input shunt resisters, this time in modded srm-313's, using ESP950 and sr007 as test phones. The differences among different input resistors are much more obvious than last time (which was done a long time ago, using modded srm-212 driving sr303). My previous conclusions still hold, but this time I am also trying vishay VAR in the mix and I feel it really is worth the extra $. It gives very wide stage and smooth warm sound (stock 313 is closed-in with obvious "mid-range burn"), no glare, strong bass.
which makes me rethink the resistor choices I made in various amps (kgss, 727, 007t).
If VAR price (per resistor) is no more than $10 over your current choice, I'd recommend going VAR. It will be well worth the extra $20.
I am re-testing input shunt resisters, this time in modded srm-313's, using ESP950 and sr007 as test phones. The differences among different input resistors are much more obvious than last time (which was done a long time ago, using modded srm-212 driving sr303). My previous conclusions still hold, but this time I am also trying vishay VAR in the mix and I feel it really is worth the extra $. It gives very wide stage and smooth warm sound (stock 313 is closed-in with obvious "mid-range burn"), no glare, strong bass.
which makes me rethink the resistor choices I made in various amps (kgss, 727, 007t).
If VAR price (per resistor) is no more than $10 over your current choice, I'd recommend going VAR. It will be well worth the extra $20.
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s102k is rather warm and smooth, not metallic. To soften the sound it is a good choice. But the sound stage is kind of narrow. VAR sound stage is much much wider.
Since you can readily hear the difference, I'd recommend adding a pair of header blocks so you can test various resistors quickly and form your own opinions.
otherwise.... just get Vishay Z foil (VAR, VSM). Clean, full, wide stage, warm, smooth, glare-free. You will have zero regrets going z foil. See if you can find 15k~36k and try them in your 252. These are precision resistor intended for scientific instruments, there must be a supplier in your area that carries them.
Since you can readily hear the difference, I'd recommend adding a pair of header blocks so you can test various resistors quickly and form your own opinions.
otherwise.... just get Vishay Z foil (VAR, VSM). Clean, full, wide stage, warm, smooth, glare-free. You will have zero regrets going z foil. See if you can find 15k~36k and try them in your 252. These are precision resistor intended for scientific instruments, there must be a supplier in your area that carries them.
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your 002 has a 50k pot?
the one in mine measures 10k. and the input impedance spec from stax site is 10k...
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VSM (surface mount version of Z foil; VAR is through-hole ) seems to be in stock on Mouser.fr
VSM 5k
https://www.mouser.fr/ProductDetail/Vishay-Precision-Group-Foil-Resistors/Y16245K00000T9R?qs=/ha2pyFaduihOX7k37s1exT4vTLoZ6tzM7VEMEw2vGxw6WEtwyWXQw==
VSM 20k
https://www.mouser.fr/ProductDetail/Vishay-Precision-Group-Foil-Resistors/Y162520K0000T0R?qs=/ha2pyFaduihOX7k37s1exT4vTLoZ6tztvuapPuzKl6H33SwWCsbxg==
VSM 5k
https://www.mouser.fr/ProductDetail/Vishay-Precision-Group-Foil-Resistors/Y16245K00000T9R?qs=/ha2pyFaduihOX7k37s1exT4vTLoZ6tzM7VEMEw2vGxw6WEtwyWXQw==
VSM 20k
https://www.mouser.fr/ProductDetail/Vishay-Precision-Group-Foil-Resistors/Y162520K0000T0R?qs=/ha2pyFaduihOX7k37s1exT4vTLoZ6tztvuapPuzKl6H33SwWCsbxg==
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hmm, that is interesting. I wonder what else they have changed in the srm002 to accommodate the pot change.
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in the 252, there is a series resistor before the input jfet ( R2 in the schematic you posted in the other thread ).
It will affect the sound as much as the series resistor in the shunt volume control.
It will affect the sound as much as the series resistor in the shunt volume control.
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