Step Up Transformer Question


Ok, so bear with me as this is new terrain for me. I was quite happy with how things were sounding and then I accidentally bumped the stylus of my Cadenza Black and snapped the cantilever clean off. I did some research and ultimately decided to have Steve at VAS at fix my cartridge but it was going to take a few weeks and there was going to be no way to play the Christmas vinyl that my wife loves so much. She told me to buy another cartridge so we could have Christmas records. I was stunned. I found a great deal on a Winfeld Ti on this site and pulled the trigger. I've got it on my table and it sounds amazing. 

After speaking with Steve though, I'm going to trade in my Cadenza and have him build me a wood body cartridge to have something different. It will also be 0.2mv output. I think I've got the 2nd arm situation sorted (gonna buy a Wand and a pod to mount it on) which leaves the phono pre. I love my Rogers PA-2 and it is switchable between MC and MM with 2 different inputs in the back. Finally got the SUT part. I've been looking and trying to figure things out. I spoke with Roger and he said the transformer built into the PA-2 is 1:10 and with that I can achieve 70 or so dB of gain. I did a lot of reading and looking and while I'm sure a 4k+ SUT is amazing that's just not where I'm at with all the other expenses at the moment. I saw the Bellari MT502 was a stereophole recommended component for many years and Amazon had one on sale for like $349 or something. Figured can't hurt to try it, it's Amazon so I can always return it. I plugged it in with some admittedly questionable interconnects I had lying around and when I put the phono stage k there was a bit more hum than I'm used to but I said let's have a listen. Holy shit. This little thing blew my mind. Better impact, tighter bass, more space around instruments so better staging, improved transients. This puts me in an interesting place. 

This is an extremely inexpensive piece and it has changed my system quite a bit. I think the little extra gain I get even at 1:12 brings the cartridge to life. My question is where do I go from here? Bob's makes the sky 30 which is switchable from 1:15 to 1:30 which I like because I can play with the gain tubes in my preamp and potentially go to a quieter 12au7 than the 12ax7 that's currently in there. Will that be a real improvement? Less hum? Had also considered ordering a Rothwell from jolly old England but can't find much on them. Thoughts? I'd like to keep this sub 1k or so for now. Maybe I'll save up for a big boy SUT later. 

rmdmoore

Showing 2 responses by alexberger

I had a number of MC step-up. All of them sound completely different. Day and night difference.

I had:

1. Altec 15095

2. Altec 4722

3. Haufe T890 (the modern production, not the vintage one)

4. Jensen 44 

5. Tamura TKS-83TWIN

6. Tamura MC20 (Sun Audio SAT-1000)

The worst are Jensen and Haufe. Really bad.

The best are Tamura.

Altecs are in the middle. Not bad.

If the load is too small (too high impedance) and sound is too bright you can solder the resistor (from 100K down to 15K) to the secondary of the step-up transformer. Smaller resistor - darker sound.

Hi @lewm ,

I used the original EAR 834 phonostage and then improved the DIY version based on the EAR 834 phonostage schematics that I built myself.

I used Ortofon Rondo Bronze with Altec 15095. Then I used Ortofon Jubilee with Altec 4722. After that I moved to EMT TSD15. I tried Altec 4722, Jensen 44 and Hauffe with EMT. Altec did not match the EMT cartridge well and Jensen and Haufe matched in terms of impedance and tonal balance was OK but sound transparency and dynamics were very bad. After that I bought Tamure 83 that sounded great with an extra load resistor. In the end I bought Tamura MC20 that was even better morey dynamic, deeper bass, bigger soundstage.

In my DIY 300B SET amp I use Hashimoto output and interstage transformers and they are great. I used James Audio transformers before that were really good, but Hashimoto gave more low level details. I think Hashimoto MC transformers should be good as well. 

I heard from people that vintage Houfe transformers are magical. It is possible, but the new Haufe production is a total garbage. Jensen 44 is a bit better but Tamura is a different league.