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Decware's DynaGrid Rectifier design log (Read 21103 times)
Steve Deckert
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Re: Decware's DynaGrid Rectifier design log
Reply #100 - 12/16/25 at 22:50:38
 

Quote:
Maybe “incompatible” is not the correct term, but my comment came directly from Elrog. I tried to purchase a pair of their 300b’s and they said they don’t recommend them for use with Decware’s 300b.


For anyone reading this, the Decware Sarah 300B amp is a choke filtered power supply with a 4 uf capacitor.  It is kinder to the Western Electric 300B than Western Electric's own 300B amplifier.  Additionally, it is an AC heated, cathode biased amp, around 60~70 mA for most 300B's so there is no way to abuse the tube or set anything wrong.  The B+ is below 400V so as far as 300B amps go, I can't think of anything that would be kinder to a 300B tube.  I can't imagine why Elrog would say that.  
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MM
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Re: Decware's DynaGrid Rectifier design log
Reply #101 - 12/16/25 at 23:19:58
 
Thanks for clarifying, Steve. Not trying to discredit Decware, just passing along the information and asking your thoughts, so I appreciate it.

Elrog said they recommend only DC heating with their 300b tube "Due to the different thermal properties of the thoriated tungsten filaments these are more sensitive to the filament supply."

I have no idea what that means.  I just enjoy the stuff people smarter than me build.
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Steve Deckert
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Re: Decware's DynaGrid Rectifier design log
Reply #102 - 12/17/25 at 17:40:09
 
That makes some sense, but it is the opposite of the WE300B which lasts longer with AC than with DC.  My honest guess, not to discredit Elrog, is that the heater design is hard to balance making cancellation of the AC hum difficult.  They don't want a reputation for tubes that hum.  With DC there is no need for hum balancing and there is no hum.  The majority of the 300B amps on the market today have DC heaters, so they should be in good shape.  Thanks for bringing this information to the forum!

Steve : )
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Bluzrover
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Re: Decware's DynaGrid Rectifier design log
Reply #103 - 12/17/25 at 22:15:07
 
The DGR is going to look sweet sitting beside my UFO25! Grin
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Steve Deckert
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Re: Decware's DynaGrid Rectifier design log
Reply #104 - 12/20/25 at 23:02:32
 
Below is a link to a short video of the DynaGrid Jr. being installed on a TORII Jr.

https://video.wixstatic.com/video/f1f204_7c278aef64454bcaa2d6b7231374721a/1080p/...

Steve

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JHC
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Re: Decware's DynaGrid Rectifier design log
Reply #105 - 12/20/25 at 23:08:36
 
This is really exciting. Any chance of getting an A/B sound test with and without the dynagrid attached?
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busterfree
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Re: Decware's DynaGrid Rectifier design log
Reply #106 - 12/23/25 at 23:30:22
 
My thoughts from a quick read are below:

Page 4, bullet 3 - “adjusts your components B+” I thought the DynaGrid Jr is not adjustable.

Page 4, bullet 4 - “adjustability”      Are you referring to the DynaGrid, not the DynaGrid Jr?

The next section talks about adjustability. Are you trying to use this one manual for both products? This is great savings, but you may want to provide some clarity in the benefits section.
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Re: Decware's DynaGrid Rectifier design log
Reply #107 - 12/23/25 at 23:31:44
 
An interesting product. Kudos.
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Steve Deckert
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Re: Decware's DynaGrid Rectifier design log
Reply #108 - 12/30/25 at 20:54:55
 

I have written a completely new owner's manual located here:  https://f1f2049f-b441-49a9-8172-74fc2a8ec172.usrfiles.com/ugd/f1f204_d7ca110b969...

Please just delete the first ones.

The new one has a very detailed explanation of how it actually works.

Thanks,

Steve
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Re: Decware's DynaGrid Rectifier design log
Reply #109 - 12/30/25 at 21:33:36
 
Very nice Steve. It seems like it would be easy to have a "stand by" switch on the DGR that controls the high voltage. Then you could power up both the amp and the DGR and both would be warm when you turn on the B+.
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Steve Deckert
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Re: Decware's DynaGrid Rectifier design log
Reply #110 - 12/30/25 at 23:21:28
 

A standby switch in this instance would potentially create a loud turn-on thump that could damage speakers or degrade tube life.  If you turn on the DynaGrid Jr after your component is turned on, the inrush of high voltage to the component is damped by the DynaGrid and there is no thump or turn on pop.  Instead the DynaGrid's 845 tube absorbs it which in turn on high current components would likely shorten it's life.  The best way to operate this is likely going to be to have the DynaGrid turned on first and warmed up for 30 seconds or so and then turn on the component.  This is actually not how I did it in the video.  In the video I had the amp turned on first, then the DynaGrid.



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Re: Decware's DynaGrid Rectifier design log
Reply #111 - 01/04/26 at 21:29:50
 
Does the DynaGrid Jr.'s mains voltage have to match the mains voltage of the component it is used with? As in, can a 110V DynaGrid Jr be used with a 240V SE84UFO2.1?
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Re: Decware's DynaGrid Rectifier design log
Reply #112 - 01/04/26 at 22:14:32
 
Was it just me, or did the launch not go well??  Why no option for the 10% deposit?
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Re: Decware's DynaGrid Rectifier design log
Reply #113 - 01/04/26 at 22:17:05
 
I imagine the deposit option wasn't available because the first 10 have already been made and will (I assume) ship as soon as the bases are made.
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Re: Decware's DynaGrid Rectifier design log
Reply #114 - 01/04/26 at 22:25:36
 
I don't think it is for sale on the website yet. If you contact Sarah you may be able to get on the list for pre-orders.
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Re: Decware's DynaGrid Rectifier design log
Reply #115 - 01/04/26 at 22:28:13
 
The first 10 builds were actually released today at 4:00 central time. Already sold out.
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Re: Decware's DynaGrid Rectifier design log
Reply #116 - 01/04/26 at 22:42:10
 
Yes, I'm glad I forgot about that and wasn't tempted to get in on that.
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Re: Decware's DynaGrid Rectifier design log
Reply #117 - 01/05/26 at 00:11:39
 
I'm looking forward to the reactions as these enter the wild. I expect there will be some blown minds.
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Re: Decware's DynaGrid Rectifier design log
Reply #118 - 01/05/26 at 17:31:53
 
Very much looking forward to reading about people's experiences with these devices. I have a Torii Mk. IV and would need two of them to substitute for the 5U4G I have in place at the moment. But I'm a year or so away from a Sarah...
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Re: Decware's DynaGrid Rectifier design log
Reply #119 - 01/07/26 at 01:59:15
 
I was able to purchase one of the first 10 during the launch. Once the units were available to purchase, I noticed they sold out by the time I navigated back to the product page after purchase. You had to be quick, which I was.

My justification for the purchase: I love my UFO25 but have had some issues with arcing rectifiers, along with one such occurance that put my amp out of commission for a few weeks while it went back to Decware.

Like many Decware owners, I find my system to be very transparent and resolving. I have tired four seperate recitifiers in my amp and would bet that I can identify each via blind test. The sonic differences are not subtle, which leads to me believe that I'm a prime candidate for a product such as the Dynagrid.

I'll share my impressions (and photos) once I receive the unit and have some time to give it a try.


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Re: Decware's DynaGrid Rectifier design log
Reply #120 - 01/07/26 at 23:33:27
 
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Steve Deckert
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Re: Decware's DynaGrid Rectifier design log
Reply #121 - 01/11/26 at 19:55:14
 

There were a lot of DynaGrid JR's that left on Friday so please if you haven't already,  read the owner's manual while you wait for it so that you are familiar with it and can get the maximum enjoyment from it.

While I haven't been able to piss one off in any way by turning it on last, the best power up sequence is:  FIRST ON - LAST OFF

This allows the heater to create the electron cloud that protects the grid and the cathode before it is hit with high voltage.  As it turns out, this still soft starts your amplifier better than a 5U4G.

We will be anxious to hear your full reports.

Steve

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Re: Decware's DynaGrid Rectifier design log
Reply #122 - 01/12/26 at 18:15:01
 
I wasn’t expecting to get my Dynagrid until late Saturday evening but I had a knock at the door right after lunch Saturday afternoon and it was the UPS driver who I greeted upon opening the door.  He stood there, holding two boxes and asked that I sign for the packages which I was only to happy to oblige.

We had a lot of errands to run but fortunately my wife wasn’t close to being ready so I carried the boxes downstairs like an excited toddler on Christmas morning.  I shave to say, the shipping department does an amazing job packing their products.  It took some time to get all the bubble wrap removed from the DGR but once it was clear of all packing materials I finally had the chance to admire the build, fit and finish of the Dynagrid.

I know it has nothing to do with the SQ of the component but the ascetic of Steve’s creations are part of the draw to Decware for me.  This thing is solid and just has an incredible look and feel to it.  That big 845 looks fantastic and I have spent the past 24 hours admiring the look of it as much as listening to it.

Now, I have to admit that I’m new to world of Decware and audio tube gear so I’m probably not going to be the definitive voice that Steve would prefer writing about his latest product, so an important caveat.

I have had a pre-owned UFO25 for eight months and have quickly surrounded it with a ZP3 and ZSB with Decware DSR3 ICs and DHCs with ZSTYX connected to Klipsch Forte IVs.  I have been using the tube complement that came with the amp and have no idea as to the age or hours of said tubes.

It has been a glorious journey thus far.  A month-and-a-half ago I got my hands on a Mullard GZ34 and have swapped the Decware 5U4G that came with amp with the GZ34.  I probably have about 60 to 70 hours on that tube and loved the increased bass and deeper 2D sound it has produced.  There was definitely more clarity across the soundstage that I enjoyed and was really wondering if I would notice anything different with the Dynagrid.

I have about seven hours into the DGR so far but I can say right off the bat I notice a distinct difference in the SQ.  Before plugging the DGR into the UFO, I put a UHQR copy of CSN on the table and played Wooden Ships.  I love the mix on this song which places vocals and instruments across the soundstage.

I then turned everything off, let the tubes cool a bit, and then removed the 5U4G and plugged in the Dynagrid.  Using Steve’s suggestion, I powered up the Dynagrid, waited a couple of minutes and then turned on the UFO25 and watched the voltmeter slowly rise followed by the amp meter.  Once everything settled, I dropped the needle on Wooden Ships and sat back to listen.

The change wasn’t striking but it was there.  I used to always fiddle with the tone controls on my old SS amps/receivers, always trying to find the right balance of trebl, bass and midrange.  With the Decware setup, I never was too concerned about that, especially when I swapped to the GZ34.  But for me, the Dynagrid really removes my need to tweak anything. The dynamics and presence across the soundstage are really spectacular.  

I was struck by the increased separation of voices and instruments, specifically how voices were coming from a higher space and the guitars a bit lower.  I didn’t change anything other than removing the 5U4G and plugging in the DGR, but I also noticed a tad more volume.

I proceeded to listen to both older vinyl and some of the newer stuff I’ve acquired over the past six months with varying levels of difference.  Clearly, the UFO25, ZP3, Dynagrid combo allows the UHQR recordings to truly shine.  But my older stuff sounds really good as well.  I am looking forward to listening to more vinyl in the next few months and continuing this journey of sonic bliss!


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Re: Decware's DynaGrid Rectifier design log
Reply #123 - Yesterday at 20:39:10
 
My DGR arrived yesterday and I have had a chance give it a good spin. I was using SE84UFOs as balanced monoblocks but due to a larger reorganization I decided to get one DGR and see how it fit in. I first ran a single amp to reorient myself to how that sounds. It sounds great, but was lacking a certain amount of depth and density, which makes sense.

My favorite album to reference test is Nina Simone Pastel Blue and "Sinnerman" in particular. The DGR immediately brought the density back and then some. It opened up the sound stage much bigger and gave it a more "3D" presence. The instrumentation is now positioned all over the room. The clapping section of "sinnerman" is always amazing, but here I felt like I could here the claps reverb off the floor, ceiling, etc. I am sure this was in the recording, so the DGR brought out even more detail and clarity, which is something I really want.

Now the question about whether to order another.... more impressions to come. And perhaps I can get a photo or two...
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Lon
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Re: Decware's DynaGrid Rectifier design log
Reply #124 - Yesterday at 23:55:54
 
Well. . . I caved and ordered one. I was going to hold out for more reviews and really think I would like the "Senior" that is not available more. . . but something made me order one now. One reason is that I figured out where I could put it in the rack and how to free up an outlet to plug it into. I can always order a Senior later if I'm still solvent and in the game. . . . I do have much enjoyed rectifiers now, but also have two other components to use them in.
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Re: Decware's DynaGrid Rectifier design log
Reply #125 - Today at 00:11:01
 
Lon, you can now start collecting 845s to test out.
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Sumiko Starling > VPI Signature Classic > Aric Audio Super MC/MM > Pine Tree Audio 67+ > SE84UFO + DGR Jr. > Omega Super 8 HO XRS

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Lon
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Re: Decware's DynaGrid Rectifier design log
Reply #126 - Today at 00:15:33
 
:) Probably not going to start doing that. . . I'll start with whatever Steve sends and see if I can hang tight with that for a while, and see how other adoptees are doing tube wise.
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Re: Decware's DynaGrid Rectifier design log
Reply #127 - Today at 00:40:03
 
Im also interested to hear what other 845s might sound like. But so far, I am very happy with the sound it is producing—especially when it's producing Black Sabbath. Everything sounds very present.

Some photos.



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Re: Decware's DynaGrid Rectifier design log
Reply #128 - Today at 00:58:22
 
We seem to listen to different types of music, but I bet the Jr. treats all types well. Nice photos!
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Re: Decware's DynaGrid Rectifier design log
Reply #129 - Today at 01:24:16
 
You only ordered one Lon? How are you going to decide what to use it with.;-)
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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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Re: Decware's DynaGrid Rectifier design log
Reply #130 - Today at 01:28:04
 
I only have one rectifier in my main system, I'll use it there.

I have a fully modded CSP3 and a Zen amp clone with mods in my audio visual system. . . That would be a hard choice if I were to put it in that system, I think my ears would have to decide!
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Re: Decware's DynaGrid Rectifier design log
Reply #131 - Today at 02:07:44
 
OMG Lon—-I was taking comfort in the fact that you were still standing firm. Now I really feel like the last man standing.  The pressure mounts…
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Re: Decware's DynaGrid Rectifier design log
Reply #132 - Today at 02:36:08
 


The Dynagrid Jr. arrived this afternoon, and boy, that's a big tube!

I've only been able to demo a few tracks in comparison to my preferred rectifier, the Cryotone 5AR4 V2. I'm going to hold off on sharing listening impressions until I've had more time with it. Smiley

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Re: Decware's DynaGrid Rectifier design log
Reply #133 - Today at 02:59:36
 
Wow even Lon has jumped in the DynaGrid pool.  Great to hear and see all the excitement on Decware’s new component.  I am sure this will be a nice improvement.  I am still trying to wrap my head around a $1700 rectifier tube.  Maybe down the road🤔.  Question for owners…how tall does the DynaGrid sit from feet to top of the 845 tube?  Thanks and enjoy!
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Re: Decware's DynaGrid Rectifier design log
Reply #134 - Today at 03:35:00
 
how tall does the DynaGrid sit from feet to top of the 845 tube?

I had the same question. Mine is just slightly over 9". Call it 9.25" with the stock Linlai tube.
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Sumiko Starling > VPI Signature Classic > Aric Audio Super MC/MM > Pine Tree Audio 67+ > SE84UFO + DGR Jr. > Omega Super 8 HO XRS

Reference Music: F♯A♯∞, Life Metal, Nirvana Unplugged, Timewave Zero, Nebraska, Pastel Blues
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Lon
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"Love without
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Posts: 27210
Re: Decware's DynaGrid Rectifier design log
Reply #135 - Today at 04:41:13
 
I'm not sure what put me over the edge Kam, I think it was the idea that this would be the "ideal" rectifier. I shouldn't have done it financially, and if my situation hasn't improved by the time this gets up there in the queue I might even cancel the order and forfeit the deposit--I have done that once before.
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HR-1,ZBIT,ZROCK3,SEWE300B; 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,Oppo PM1
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