Which SUT? .... for .3mv/10 ohms MC cartridge into 3mv MM input sensitivity
Zesto Allasso SUT, very flexible, front controlsI've asked for a price https://www.zestoaudio.com/andros-allasso-step-up-transformer-mc-to-mm-extremely-versatile/ I really do not understand why a 0.0 setting could not be provided for MM pass thru |
| Post removed |
I found this which, if you scroll down has a chart for many cartridges by model 3, and a calculator where you plug your #s in http://www.mh-audio.nl/Calculators/StepUpTransformer.html |
I think I am getting this, lemme know if I got it wrong i'm just doing some math to learn the formulas of course when you know this stuff it's intuitive ...................... Impedance change factor is square of amount of transformer boost 47,000 (typical MM phono input) 47,000 divide by change factor = resultant actual impedance ........................... " The recommendation of Rothwell Audio Products is in line with Ortofon, Audio Technica and most other cartridge manufacturers - that 100 ohms is a good value for most cartridges, and that the exact value is not critical as long as it is well above the cartridge's source impedance." ................................... signal strength: enough, but avoid too high, say 5mv max (easy math) impedance is what effects the sound too low = dull. too high = too bright ...................................... AT33PTG/2 is .3mv and coil 10 ohm impedance coil 10 ohm x 10 = 100 ohm goal (average) ...................................... working backwards from desired impedance average of 100 47,000 divided by 100 = 470. 470 is square of 21.5 (boost factor found working backwards) .3mv cartridge x 21.5 = 6.45mv = TOO HIGH SIGNAL STRENGTH ............................ lower the signal strength means lower the boost means impedance goes up, just don't go up too much IF desired max signal 5mv divided by .3mv = 16.7 signal boost. 16.7 squared is 279 47,000 divided by 279 is 168 ohms resultant impedance, not bad! ..................................... typical boost 10x or 20x, not 16.7 unless custom built. .3mv x 10 is 3mv, TOO LOW? (mx100z phono sensitivity is 3mv) .3mv x 20 is 6mv" TOO HIGH? I PICKED THE WRONG DAMNNN CARTRIDGE!!! ........................................ Resistors, parallel with Transformer's secondary are a method of adjusting the impedance i.e. 100k resistor across 47,000 is 32,000 "NO RESISTOR sounds as good as NO RESISTOR" OMG |
rauliruegas happily my mx110z has 2 phono inputs that denon au-320 has the 2 inputs and pass, but I would use only 1 input for rear tonearm’s cable: 3 or 40 setting for MC, and use the PASS for my any MM, typically my MONO, correct? it shows 3 ohm and 40 ohm, how do I translate that into gain factor? this guy says very nice, accepts returns 100% rating https://www.ebay.com/itm/333632155436 |
