Forums - Dynagrid Jr. Reviews and Impressions

Lon

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Re: Dynagrid Jr. Reviews and Impressions
Reply #100 - 03/06/26 at 12:14:48

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.

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HR-1,ZBIT,ZROCK3,SEWE300B,Dynagrid Jr;Rega RP3+all GrooveTracer mods;PSAudio:PST+DSD DAC Mk II,NPC,PowerBases,AC-12 pwr cbls, Reference spkrcbls;Mapleshade SamsonV3;VeraFi Audio cpts VooDoo:Cremona+Amati interconnects;Stack EQ; headphones:Sennheiser HD800S,ZMF Ori

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PointThatThing Verified Member Posts: 26	Re: Dynagrid Jr. Reviews and Impressions Reply #101 - 03/06/26 at 19:24:38 Hi Kahuna Jack So I take it you have run the U52 in your UFO? I have one but have been to nervous to try it as some say it may not be compatible with the UFO and it’s not a cheap tube, so I’ve been reluctant to try mine in case I fry it Keen to hear your thoughts
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CAJames Seasoned Member "I've run every red light on memory lane." Posts: 3128	Re: Dynagrid Jr. Reviews and Impressions Reply #102 - 03/07/26 at 00:32:48 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.
Back to top	[Volumio \| Jay's CDT2 MRK3] -> Denafrips Terminator 2 + Gaia Sumiko Pearwood -> Mapleknoll Athena -> Luxman SUT -> Mapletree Phono 3E STR-1002 -> Woo WA22 -> 2x UFO25s, balanced monos Omega SAM , Hifiman Arya, Audeze LCD-XC IP Logged

Tony

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Re: Dynagrid Jr. Reviews and Impressions
Reply #103 - 03/07/26 at 01:16:54

I wanted to jump in and say I installed a Cossor 53KU rectifier in my UFO25 on Monday and couldn't be happier with its performance. This is the best Decware amp I have had to date, so I was understandably reluctant to gamble. My research, however, was positive, so I gave it a try. I'll jump back in after a while to let folks know how it's going, but so far, it's excellent.

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Lon

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"Love without
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Re: Dynagrid Jr. Reviews and Impressions
Reply #104 - 03/07/26 at 01:51:41

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.

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HR-1,ZBIT,ZROCK3,SEWE300B,Dynagrid Jr;Rega RP3+all GrooveTracer mods;PSAudio:PST+DSD DAC Mk II,NPC,PowerBases,AC-12 pwr cbls, Reference spkrcbls;Mapleshade SamsonV3;VeraFi Audio cpts VooDoo:Cremona+Amati interconnects;Stack EQ; headphones:Sennheiser HD800S,ZMF Ori

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Kahuna Jack Seasoned Member Posts: 237	Re: Dynagrid Jr. Reviews and Impressions Reply #105 - 03/07/26 at 06:36:51 PointThatThing yes the U52 as James states is an awesome sounding rectifier in the Zen UFO . I had an eye out for arcing or bright sudden surges but so far it's behaved. I wont risk it in Torii Jr but that's what the DGJR is for.
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PointThatThing Verified Member Posts: 26	Re: Dynagrid Jr. Reviews and Impressions Reply #106 - 03/07/26 at 06:56:11 Thanks for the reply and James for input too. I’m definitely give it a go
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PointThatThing Verified Member Posts: 26	Re: Dynagrid Jr. Reviews and Impressions Reply #107 - 03/07/26 at 07:16:39 Hi James, just wanted to check 2 details, I presume that the basic SE84 UFO is circuitry wise the same as the higher spec models and so will also be ok with the U52? And secondly is the GZ33 the same as the Cossar tube you mention?
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CAJames

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Re: Dynagrid Jr. Reviews and Impressions
Reply #108 - 03/07/26 at 09:37:14

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.

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[Volumio | Jay's CDT2 MRK3] -> Denafrips Terminator 2 + Gaia
Sumiko Pearwood -> Mapleknoll Athena -> Luxman SUT -> Mapletree Phono 3E
STR-1002 -> Woo WA22 -> 2x UFO25s, balanced monos
Omega SAM , Hifiman Arya, Audeze LCD-XC

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Lon

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"Love without
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worthless!"
Philip K. Dick

Posts: 27702

Re: Dynagrid Jr. Reviews and Impressions
Reply #109 - 03/07/26 at 12:26:49

Just want to add that the Black Treasure 300B-Z came back in pretty quickly. The 7300B-D are just a bit too lean sounding with the JR. That extra coloration that my favorite rectifier brought suits them better, while the JR. really makes the 300B-Z shine.

Also I did try three 0G3/85A2 voltage regulation tubes, and that sound is interesting, less channel separation in an LP like way, and then I tried two 0G3/85A2 tubes for the output tubes, and a 75C1 tube for the input tube ant that is very good, but my favorite seems to be two 75C1 for the output tubes and one 0G3/85A2 for the input tubes--I'm getting a deep, wide soundstage with dynamics and a nice frequency balance. Those will stay for a while.

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HR-1,ZBIT,ZROCK3,SEWE300B,Dynagrid Jr;Rega RP3+all GrooveTracer mods;PSAudio:PST+DSD DAC Mk II,NPC,PowerBases,AC-12 pwr cbls, Reference spkrcbls;Mapleshade SamsonV3;VeraFi Audio cpts VooDoo:Cremona+Amati interconnects;Stack EQ; headphones:Sennheiser HD800S,ZMF Ori

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PointThatThing Verified Member Posts: 26	Re: Dynagrid Jr. Reviews and Impressions Reply #110 - 03/07/26 at 18:57:26 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?
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CAJames Seasoned Member "I've run every red light on memory lane." Posts: 3128	Re: Dynagrid Jr. Reviews and Impressions Reply #111 - 03/07/26 at 20:25:48 Yes, GZ37 is safe IMO.
Back to top	[Volumio \| Jay's CDT2 MRK3] -> Denafrips Terminator 2 + Gaia Sumiko Pearwood -> Mapleknoll Athena -> Luxman SUT -> Mapletree Phono 3E STR-1002 -> Woo WA22 -> 2x UFO25s, balanced monos Omega SAM , Hifiman Arya, Audeze LCD-XC IP Logged