https//hackaday.com/wp-content/uploads/2014/06/portabe_tube_preamp_schematic.jpg Here’s a similar one to what I built:
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Dear @fleschler : That SUT has 3 diferent controls at the front plate and I don't know but I can't imagine how the designer let the signal totally out of those 3 controls each time you make changes down there. Anyway, I prefer the straigth one as the AU-1000 and is not so expensive when you find out. R. |
I have always like the idea of this unit. https://www.ebay.com/itm/ORTOFON-T30-step-up-transformer-MC-SUT-best-sound-quality-MINT-CONDITION/33... But I use one of these right now which I am very impressed with. https://www.vinylengine.com/library/denon/au-320.shtml |
Dear friends : Obviously that the transformers in a SUT is critical and has to be reflected in the frequency response range where is flat not at +-3db My advise is to ask always that spec before pull the triguer and compare in between some SUT's. We have to remember that the SUT ( other than the cable/connectors ) is the first amplifier device where the delicated cartridge signal must pass and we want to preserve the integrity of that signal putting the lost signal at minimum. It's imposible for passive or active devices not lost or adds " something " . R. |
I own an EAR 324 phono pre-amp which has transformer settings of 4, 15 and 40 ohms and 3 gain settings. I struggled for a year to achieve the correct sound for my Benz Ruby 3. It was either too bright and thin or too dull and heavy sounding. My cable manufacturer friend told me to just use a resistor at 220 ohm on an Audio Interface L40. That is the perfect setting for the cartridge. The Zesto has four settings within 10 ohms of 220 ohms including 220. It has the widest range using nearly identical Jensen transformers. I have not heard anyone claiming the Zesto SUT isn't superb. Does anyone know that the Zesto is inferior to the Ortofon or Denon or my Audio Interface? |
- 51 posts total