I'll add my info as concisely as I can.

My JR. is serving as the rectifier for my SEWE300B amp.

It replaced several favorite rectifiers, notably a Psvane 274B-Z, and a Linla 274B-D, and an Amperex 5R4WRGB. The Psvane was used most often--a fine rectifier.

What I heard most different from the rectifier in the amp is an increase in clarity and dynamics while maintaining a great frequency balance. I did a lot of tailoring of power and isolation and I have several times reinserted a rectifier into the amp for comparison. . . and gone back happily to the JR.

After reading Lon's review, I bit the bullet and ordered a Dynagrid Jr.  I have used the stock Sarah 300B rectifier, Cryotone 5U4G, 5AR4 and none compared to the Dynagrid Jr.  I wont repeat what has been said before but I am thoroughly enjoying my Sarah 300B and the rest of the system.  BLUF, I listen while I work and I do not tire of listenijng.
Bob

I was hoping to see posts from more than just three of the "usual suspects." But such is the state of the forum these days.

Let us know your impressions of the Cetron tube when you have listened to it a bit. I am using another Linlai 845 that seems to be constructed the same as the stock one, but has a carbon coating within the glass. There is a subtle difference that I enjoy.

No DGR here. To be perfectly honest I don’t know on which component to use it or how many I’d need. I vaguely recall that coming up in the past. I suppose I could use up to three of them - UFO, UFO25, and or CSP 2+  I’ve kicked around the idea of ordering one or two but just sit paralyzed with overthinking it all. Interested if anyone faced that dilemma and how you handled it.

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Order one and try it in all three, after it is broken in. Leave it in the one that makes the biggest improvement (it will probably be the UFO25) and then decide if you need to order more.

Sean wrote on 10/02/26 at 00:05:28:

Sean, that is good advice from James.

I have my DGR connected to my Signature CSP which feeds my Signature Monoblocks. Steve upgraded all three to the latest modifications a year or so ago.  I’m also using the Linlai 845 carbon-lined primarily to match the PSVANE 274B-Z carbon-lined tubes in the monos.  I debated the “one vs two” DGR(s) for my system and decided to start with one in the preamp.  It replaced an RCA 5U4G, RCA 5R4GY or Cryotone 5U4G (depending on the day).  Even with my post-USAF flying career, 72 year old ears I can hear a positive change…I like the sound.  I “probably” will not be ordering a second DGR. I’m very happy with my system and I don’t have room for anything else.

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You can try it in both and judge for yourself how big the relative improvement is. I know a couple of posters who have done that, with a STR not a DGR but same idea, and my recollection is it was an easy choice to use it in the power amp, not the CSP. Or just get two.

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I feel your pain, I too suffer from outlet deficiency. But I can see a lot reasons why this would cause more problems than it solves.

First is Steve would need to redesign all the amps, presumably with a different form factor, to make this work. And he'd need to stock all the parts to make two different versions of all the amps.

Then there is the whole transformer question. Part of the DGR magic is it separates the filament current for the rectifier from the power transformer for the rest of the tubes. If you want that you'd still need two power cords, even if there is only one chassis. If you really wanted a single power cord, that would be doable in theory, but there would have to exist a power transformer that has the right windings for a 845 tube filament in addition to all the other currents and voltages. There might be such a thing, or there might not.

And then, obviously, if the DGR was built into the amp you couldn't use it in other, non-Decware gear. And it sounds like more than a few people are doing exactly that.

JMO/FWIW/YMMV and all that.

Thanks for the detailed electrical breakdown CAJames. I too have wondered if perhaps a new amp is in the pipeline that will integrate the DGR. Maybe a UFO35....?!

My Cetron 845 arrived today and I have been listening to it for a couple hours. I wouldn't say its a radical departure from the stock Linlai. Perhaps a slightly tighter bass to mid bass region. I am listening to the new Swans live album, "Newly Sentient Being" (not everyone's cup of tea, I realize) and the production is really top notch. The sense of space is incredible. Snare and bass drums really bounce around the room. The first two tracks are worth a listen just to get an amazing soundstage experience.