Need a sut for Hana ml
My simple answer: x factor 14, see below. I’m still new to the world of MC and SUT, others will correct me if wrong. I learned a great deal here after I started this thread about SUT for .3mv; 10 ohm resistance https://forum.audiogon.com/discussions/which-sut-for-3mv-10-ohms-mc-cartridge-into-3mv-mm-input-sens... My conclusion was to choose a SUT with a few variations, options, perhaps factory retrofit, to solve both current and future cartridges. Can CARY factory modify yours? In a way you can revert or modify in the future? btw, the impedance settings on the front of a SUT are not the same as the resultant output, it doesn’t know what your cartridge is sending or it’s coil’s impedance. ................................... My choice was AT33PTG/2, output .3mv; 10 ohm impedance. Your Hana ML seems quite similar .4mv out, 7 ohm impedance, I like it’s separation and tight channel balance, that’s why I picked mine. But, the combo of a bit stronger signal with lower coil impedance can be problematic. You need to find the highest signal strength you can work with (highest x factor you can use to control the impedance that will be shown to the phono’s 47k. The simple formula for impedance is to use 10x your coils impedance as a general goal for the amount to show to you preamp’s 47k input (yours: 7 x 10 = 70, go up from there). OEM simply says greater than 100 ohms. Thus you want your phono input 47k divided by x factor squared (xfs) to be up/dn from 70. 47k divided by 70 is xfs of 670, that’s a high x factor of 26. Problem: .4mv x xf 26 = 10.4mv, much too high signal. if x factor 16, then signal = 6.4mv (some loss, still high). Now, xfs = 256, 47k divided by 256 = 183 (much closer to 70). if xf 14: signal 5.6mv; 47k div by xfs 198 = 240 ohms to phono perhaps your best choice. if xfactor 12, signal then 4.8 before a bit of loss, 47k divided by xfs 144 = 326 ohms, ’more above’ 70 ohm guidance, but within OEM guidance, |
I don't understand adding resistors as has been recommended, however, from my earlier x factors = xfs = resulting impedance calculations, that might be the ideal way to go. http://www.hagtech.com/loading.html calculator near the bottom of the page: "So let's turn this around. What resistor should you put in parallel with the 47k phonostage to change the loading to a desired value? Note, you can only go lower in value, not higher (negative answer means unrealizable)." example: (I plugged in desired 140, turns ratio (x factor) 14Desired Loading: 140, Turns Ratio: 14:, Resistor = 66 k like I say, I don't understand, but they go on to say: "You can also put the parallel resistor on the primary side, but then the value is the above divided by the turns ratio squared." |
after you get it right: your new stylus profile may be giving a brighter sound than your sl https://www.analogplanet.com/content/high-performance-high-value-hana-ml-and-mh-cartridges "The MicroLine stylus has an even narrower “contact patch” than the already “severe” Shibata stylus used on the Hana SL. It more closely resembles the cutting stylus itself and so is theoretically capable of extracting more information from the grooves, particularly the higher frequencies and especially those located closer to the label area." he ran it thru this MM/MC phono stage which has rear switches to adjust loading ELAC - PPA-2 Alchemy Phono Preamplifier https://www.musicdirect.com/phono-preamps/Elac-Alchemy-PPA-2-Phono-Preamplifier |
lewm As I mentioned/hoped, others should catch any mistakes I made. Thanks for pointing out OP’s particular phono stage resistance is 68k, not 47k (my errant assumption was ’normal’ 47k). My initial and specific answer ’x factor 14’ is far from complicated. (into 68k, I now say x factor 16) Then I yapped about how I came to that conclusion. That’s complicated. Get a SUT with optional loading is not complicated advice. Find a SUT that fits your existing or future cartridge’s specs is complicated............................................ The yap (here and prior) was for OP and/or anybody following to be able to figure this out on their own. It’s inverse: The higher the x factor, the lower the resultant impedance ’shown’ to phono stage will be. OP’s cartridge .4mv signal strength and coil impedance of 7 is a particular challenge. Many people love that cartridge. Some, not all, know what their phono mc stage or their SUT is doing. Sounds good, great. OP is asking what might work for him, using a SUT. OP started with Too High as his problem. He needs to determine HOW HIGH a final signal strength is ok for his system, to get the resultant impedance low. (even lower to work withhis phono stage’s 68k impedance). x factor 16 = 6.4 mv signal strength, his 68k phono stage increases the resultant impedance to 265. x faxtor 18 = 7.2 mv ..... resultant impedance lowers to 209. IS 7.2 mv tooo high? OP’s 68k phono stage impedance exacerbates the problem, it raises OP’s/ANY coil’s resultant impedance by 45%. (68k divided by 47k = 1.45) x factor 14. into ’normal’ 47k: resultant impedance ’shown’ is 240. into 68k that is 345 (+45%) The basic way to lower ANY coil’s resultant impedance shown to ANY phono stage: is by increasing the x factor which increases the xfs, which lower the impedance shown. Precisely the problem here, as the OP is needing a lower x factor to solve his phono stage’s ’too high’ signal boost, while needing low resultant impedance shown. .................................................. Resistors: as I said, I don't understand that, but it appears to be the way to more precisely solve this. |
