Forums - Decware's DynaGrid Rectifier design log

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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Posts: 397

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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Cambridge CXN100, SRA Signature Hybrid Mamushi IC, SEWE 300b, ZSTYX SC, Lii F15 & W15 in open baffle.

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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 Senior Member Posts: 65	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!
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Steve Deckert Administrator If the 1st watt sucks why continue? Posts: 6464	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 Senior Member Posts: 77	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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Posts: 457

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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Lon Seasoned Member "Love without guts is worthless!" Philip K. Dick Posts: 27185	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 Administrator If the 1st watt sucks why continue? Posts: 6464	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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CAJames Seasoned Member "I've run every red light on memory lane." Posts: 2990	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

Administrator

If the 1st watt
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Posts: 6464

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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Ghostship Seasoned Member Posts: 170	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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Yakatak Senior Member Posts: 52	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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JHC Senior Member Posts: 77	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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CAJames Seasoned Member "I've run every red light on memory lane." Posts: 2990	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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JHC Senior Member Posts: 77	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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Lon Seasoned Member "Love without guts is worthless!" Philip K. Dick Posts: 27185	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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CAJames Seasoned Member "I've run every red light on memory lane." Posts: 2990	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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Karl Verified Member Posts: 40	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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HiFi Bri

Senior Member

Posts: 80

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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Lon Seasoned Member "Love without guts is worthless!" Philip K. Dick Posts: 27185	Re: Decware's DynaGrid Rectifier design log Reply #120 - 01/07/26 at 23:33:27 Now available to order: https://www.decwareproducts.com/dynagrid
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