Forums - Decware's DynaGrid Rectifier design log

Welcome, Guest. Please Login or Register

12/21/25 at 06:38:55

Most recent 50 posts

Forums › AUDIO FORUMS › General Discussion and Support

‹ Previous topic | Next topic ›

Pages: 1 2 3

Decware's DynaGrid Rectifier design log (Read 17760 times)

Steve Deckert

Administrator

If the 1st watt
sucks why continue?

Posts: 6459

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.

IP Logged

Seasoned Member

Posts: 377

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.

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

IP Logged

Steve Deckert

Administrator

If the 1st watt
sucks why continue?

Posts: 6459

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 : )

IP Logged

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!
Back to top	IP Logged

Steve Deckert Administrator If the 1st watt sucks why continue? Posts: 6459	Re: Decware's DynaGrid Rectifier design log Reply #104 - Yesterday 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
Back to top	IP Logged

JHC Senior Member Posts: 73	Re: Decware's DynaGrid Rectifier design log Reply #105 - Yesterday at 23:08:36 This is really exciting. Any chance of getting an A/B sound test with and without the dynagrid attached?
Back to top	Sumiko Starling > VPI Signature Classic > Aric Audio Super MC/MM > Pine Tree Audio 67+ > SE84UFO x2 balanced monos > Omega Super 8 HO XRS Reference Music: F♯A♯∞, Life Metal, Nirvana Unplugged, Timewave Zero, Nebraska, Pastel Blues IP Logged

Pages: 1 2 3

Forums › AUDIO FORUMS › General Discussion and Support

‹ Previous topic | Next topic ›