I have two Ortofon SL15E MC cartridges (one is mkII) and I am looking for a MC step-up transformer (to be connected to MM phono stage). Here is what the specs sheet show for SL15E:
Output 0.015 mV
Internal impedance 2.5 ohms
Can you recommend a suitable step-up transformer for these cartridges? Are any of the vintage microphone transformers suitable in this case?
It is much better than the earlier Ortofon transformers I have tried.
I think I bought it for about $100 (Canadian) used. Mike.
"Output 0.015 mV"
Did you mean 0.15mV?
I was really amazed when I pulled out the paperwork for the Ortofon SL 15 Mk II this morning to respond to kkibrisli regarding his transformer question.
When I read an output of 0.015 mV I almost couldn't believe it myself, and I OWNED this cartridge. I didn't know a volt from an ohm from a millivolt thirty years ago. All I knew was that I loved the sound of the Ortofon stepped up by the Supex SDT-77 transformer into the phono stage of my Audio Research SP3-A-1.
I'm even MORE impressed with the performance of this Supex now that I know the output of the Ortofon. 0.015 mV! Whew!
Dave Billinge (an AA member) was kind enough to send me the specs.
I had an SL 15 Mk II back in the 1970's and loved it. Ortofon recommended their own STM-72 transformer, but I got MUCH better sound using a Supex SDT-77 transformer. I stll remember the demo at my dealer, Stereo Emporium in Buffalo NY. I sat there with my future ex-wife and she said "get the better one" (the Supex). She didn't have to tell me twice.
UPS lost the cartridge when it was shipped to Ortofon for a re-tip. Too bad too, because it would have been a great match with my Quads.
I've still got that Supex transformer around here somewhere. Thanks for reminding me! I need to look for that.
That sounds interesting. Do you intend to keep it?
It's one of the things I've procrastinated about putting on eBay for years, but never have. I did give it a try when I got my Denon 103R but it was a poor match since the Denon has very different specs than the Ortofon.
I'm sure once I sell it though, then I'll have a need for it. You know how that goes!
what is your price range?
I am hoping to stay below $500 unless there is something really special. :)
There are lots of choices. Classic step up trannies that are still obtainable are the Cotter, Denon, Dynavector, Fidelity Research, Grace, Ortofon, Supex, Audio Technica and many more. For those lurkers, Grace did indeed have a great unit, not imported to the USA. Most Ortofons, even the small cheapies, are highly regarded.
FR3, FR3T and Dynavector DV-6, as well as the Cotter, can be a little bright, especially with the slightly bright cartridges. I can heartily recommend the Denon AU-320. I have used this one and heard it in many systems, with never a fault. It can also switch between two tt setups and has 3-10 or 40 Ohm Nominal settings. It has a very natural sound, too.
Plus, you can save half of your budget for more cartridges or LPs...
Thank you, Interstage Tranny. This is the kind of suggestion I was expecting to get. I will research Denon AU-320 further.
I also have Denon DL103 and this will allow me to try that one as well but honestly this is not my highest priority. I want to get the best step-up setup I can afford for SL15E .
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