I’m still really enjoying the new window into my system that replacing its only rectifier with the Decware Dynagrid Jr. has brought. Today I changed the 300B output tubes from the Shuguang Black Teasure 300B-Z to the Linlai Dream Series 7300B-D and they sound quite improved with this now fully seasoned outboard rectification, and with the new voltage regulation tube trio. Nice to have a different “feel” to the amp and the entire presentation as a change of pace, though I suspect I’ll put the 300B-Z back in within a few days.

FWIW I am currently using U52s in my UFO25s. I have used them off and on for years both the in UFO25s and before that in my original UFOs. The U52 along with the "big bottle" 53KU are my two favorite rectifiers.  

I tried a new production Cossor 12AU7 and it was too bright for me. It might have mellowed some with more time, but I couldn't take it long enough. That rectifier may be different.

I must say though. . .I am very happy to be off the rectifier merry-go-round in my main system with the SEWE300B. It took a while for it to season in and be tuned in but now it's better than any rectifier I've tried, and that was literally more than a dozen, close to two.

Thanks for the reply and James for input too. I’m definitely give it a go

Yes, all current UFO versions are the same from the perspective of the rectifier. But one other thing, I see a lot of UK 5U4G rectifiers advertised as U52, but that isn’t really correct. The U52 to which I’m referring is the GEC U52 with the rounded base:

https://www.r-type.org/exhib/aad0149.htm

The GZ33 is different. I have them as well and they are very nice, but a step below the 53KU and U52. There is also the “skinny bottle” GZ37 that is a more modern version of the 53KU, but I like it less than the others. JMO/YMMV and all that.

Hi James
Thanks for the confirmation. My U52 is a GEC, just need to find it, thought I knew where I had put it but it’s not there…treasure hunt coming up
Please confirm the GZ37 is also safe to use in the UFO?

The DGJR has settled in to my Rachael for the last few days. Some power cable swaps in CSP3 Annv modded pre but thats about it. Even though I have a pile up nicer power cables the stock cable remains on DGJR and plugged in to a Panamax power strip. Nothing fancy there.

The only 2 solid conclusions I can offer at this point is that 'A' I need the DGJR for my Torii Jr v2 for as long as I own it. 'B' It would be a long drawn out extra innings game deciding between it and my GEC U52 which is a pretty expensive rectifier tube if one was to go shopping for it today. That U52 is a very happy place.

Herb Reichert once made a comment in writing that he can hear solid state rectification . I wonder if thats what I am hearing with the DGJR in place. Maybe a touch more detail,quickness and sharp edges?? you know all the common catch phrases used. But this could all be just tricks my mind is playing on me. I do know that when the U52 gets plugged in? magic stuff happens.

Keep in mind my evaluation is made from what some would consider budget or humble scources. Geshelli dac w/Sparkos, Ariston RD80 w/Goldring E3 cart into either SunValley phono stage or ZP3. Sometime even a FiiO portable player plugged straight in to amplifier . So no SDFB's , No high end power conditiong , no mystical grounding devices, no high end fuse options. So take that in to consideration.

I noticed a lot of heat reduction when used with Torii Jr but not quite as much w/ Rachael or 2.1 amps as both of their power transformers stay hot to the touch. Im sure its just noticed more due to the Torii Jr runs much hotter then the other 2 in the first place.

Still waiting for my Psvane Summit 845 to be delivered.

Wow. I don't listen to anything like that, or that type of music actually, so have no reference to compare and contrast. I do have some pretty crappy sounding airchecks of jazz rrom the thirties and forties and I wouldn't expect the JR. to save them. I think they might sound a bit better with the JR. but still sound like crap!

What saves a lot of recordings for me is the ZROCK2 and now the ZROCK3. And in general what I can say in the JR.'s defense is that now no matter what I throw at it the sound is improved from what any of my most used rectifiers would deliver. And this second 845 really is a little step up from the stock. I'm happy!

I guess my testing would be considered incomplete really. Take the Angel Digital vinyl pressing of Kathleen Battle. Is all that aggressive top end of her voice just the mic distorting? My stylus/cart not set up well enough to track properly ?? The Goldring is on the bright side to begin with.
My next step would have been to try a conical stylus or to try and dial in my stylus angle a bit better idk. I have boxes full of Angel digital cd recordings I could dig through them and find another soprano based performance to see how it compares. My signal tubes are already on the warm side so......

Regarding the DGJR's performance on crappy recordings?? Maybe digital Telarc / Angel classical recordings are not something you want to hear into with any more detail . Even though I have enough in my collection I'm far from an expert on their merits other than I read people disliking them.

Maybe I'll test with something just climbing out of crappy status.... like a heavily compressed rock recording. Bob Seger or Springsteen etc