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In Reply to: RE: Thank you, Ralph. New setup with SUT posted by MP on December 20, 2022 at 07:54:33
The phono gain without the cascode is about 45 dB. Works nice with 5mV.
Pay attention to loading of the output of the SUT. If its designed for your cartridge the stock load of the preamp (47K) is probably fine. But if its not intended specifically for your cartridge, there may be additional loading needed. The loading strip on the MP-3 might be handy for this. If you change cartridges, the loading of the transformer will change with it. If you are running an SUT like this (for example, a Jensen) the loading will be a resistor and capacitor network (Jensen has suggested values for all known cartridges on their website).
Follow Ups:
Ralph, thank you for the info.
The SUTs recommend 47K phono loading.
Will look into the Jensen's loading network info.
That sounds to me that the SUT is designed for your cartridge. Is that correct?
If not, then it will take some testing on the bench with your cartridge to sort out what the correct loading should be.
They are generic off the shelve SUT, not specifically designed for my cartridge. My cartridge has fairly high internal impedance (90 ohms).
"If not, then it will take some testing on the bench with your cartridge to sort out what the correct loading should be". What kind of bench testing is needed?
I am under impression that the primary load cartridge sees is (SUT provides = 47K/SUT run ratio square), ideally is 7-8 times of cartridge internal impedance. If the primary load cartridge sees is less, like 3-4 times, efficiency would be lower - less gain.
Read it somewhere that one could increase phono stage impedance from 47K to 100K or higher to give higher primary load that cartridge sees and increase efficiency (gain). Do I understand correctly?
Read it somewhere that one could increase phono stage impedance from 47K to 100K or higher to give higher primary load that cartridge sees and increase efficiency (gain). Do I understand correctly?
I don't think so. You have to load the transformer correctly in order for it to express its turns ratio correctly. If the load value is too high, the inter-winding capacitance starts to play a role and the frequency response won't be as flat.
I would check with the manufacturer and see if they have a recommended network for loading with your cartridge. Don't forget that the capacitance of the phono cables also plays a role- for this reason the output cable should be as low capacitance as possible!
Installed a cartridge Dynavector Te Kaitora Rua (0.26mv, 6ohms). SUT Loads at 30X. Very happy with the sound.
I think my MP3/M60/Quad 989 likes high phono input (7.8 mV).
Bought an used Coincident Total Eclipse (94 sensitivity, 14 ohm impedance), waiting for delivery. Read old posts that M60 and total Eclipse are great match.
NT
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