Looking forward to the reviews. My biggest issue of external rectification was the umbilical cord with AC and DC running parallel over length. It seems that the benefits outdone the negatives in this instance.

I am still trying to fit a DynaGrid in my scheme. The Zrock 2 works well in loop C. I don't at this time think a Zrock 3 will be beneficial installed after the CSP2+. The power conditioning scheme in place and added sub gave loop B an edge that propels it past loop A. More time and listening will tell the tale. If this holds, placing the RtoR in a horizontal position raising it should give enough room for a DynaGrid underneath.

Hope your grief is quailed today Lon!

No doubt here Lon. I wanted the Zrock 3 for that very reason placing after the CSP2. Just running out of component real estate. Maybe later.

The fourth time out for delivery is the charm–about forty minutes ago a UPS truck pulled up, with both packages, the Dynagrid Jr. (rectifier replacement) in one, the tube and connecting cable in the other. I marveled at the beauty of the component and hooked it all up after it all warmed a bit (it is COLD out there).

I hear a bit more soundstage width, about the same depth, if not a bit more forward. And perhaps a bit more dynamic. Still early though. Definitely a change . . . . I may reverse the fuse direction tomorrow because it does have that “sound” when the fuse is in the direction I usually don’t prefer.

This is a BEAUTIFUL component. Glad I went with walnut for the base, and I’ve never had an 845 before and it’s HUGE tube, will serve as a night light for anyone afraid of things that go bump in the night.

This is going to be fun. My favorite rectifier in the amp is excellent to listen to, this Dynaglide Jr. is a new thing that is exciting to listen to tonight. . . .

Congrats, Lon! I’m looking forward to hearing your impressions as it breaks in.

COLD. I'm getting used to it, especially when it's not snowing. Lots of snow, over a foot, everywhere I haven't shoveled, and on all the trees. BEAUtiFUL.

This is the first morning with the new Dynagrid Jr. I'm listening to John Coltrane "Crescent" Impulse Japan SHM-SACD, an amazing mastering of this classic material.



To be perfectly honest right now. . . I would say that my favorite rectifier in the amp probably gives me a slightly better sound (more to my tailored taste) than the Jr. is dishing out. But it's early yet and I have more tailoring to do as well as the component has more seasoning to do.

Yep we all need another obsession

The DynaGrid uses a 1.6 amp fuse. You most likely will be able to use an existing SDFB if there is a place to plug it in.

How many hours do you have on the DGR? My guess is you'll hear (big?) changes until you have well over 100 hours on the 845 tube, but I curious to hear your experience. And the more you have the DGR on the warmer you will be...

I would also be surprised if you didn't hear differences between 845s, and maybe I have a solution for having to buy them in pairs, I'll PM you.

One interesting thing: the right meter registers zero. I wonder if it should.

It's the voltage meter and obviously the component is functioning and it should I think register voltage. Tapping it does nothing, it's been in a warm spot for nearly 18 hours and functioning about half that time or so. . . if it's frozen it should have warmed up. I think it's probably broken. The chassis around neither meter gets warm.

I'm not too concerned. I would actually have loved the device without meters, so my only real concern is re-sale in nature, something that may never happen in my lifetime. Thanks-- I'll let Steve know.

I dont have helpful audible notes ready to share yet but I can share that my Dynagrid and its 845 do not toss out that much heat as I was expecting. Much less than a stock Dyna ST 70 or a Mac 275 .
I've got 6 or so 845's "in my cart" just window shopping status mostly. The China Hi Fi store and it's USA affiliate sell singles of almost all of the fancy Chinese tubes. Psvane direct also sells singles of some like the top of line Summit. Im not sure if a Summit is needed but it would sure look cool. Almost NOS RCA 845 cool : )

MM wrote on 02/01/26 at 18:13:41:

I absolutely hate having to send an amp in for repair. I may have to send my CSP3 in for repair in the future, the rectifier tube socket seems problematic. But I can make it work and I'll hold off. The meters really don't mean much to me so if I am going to keep the Jr. it won't go back to the mothership just for that. If I decide to sell in the future, probably.

Quote:


I don't know how much the rest of the DGR needs to break in, but for the 845 I found just leaving the tube powered on helps a lot. You don't need to play music or even have the amp powered up, it just needs to cook. FWIW.

Okay, one more change I made today, and a big one.

I realized while I was out eating with my wife a change I could make that would probably be for the better. IN order to add an outlet to my system for the Jr. I had put a PS Audio PowerBase normally only used for isolation into active electrical operation. There is one-way gate filtering, a low-loss power filter that reduces both differential and common mode noise in the PowerBase that supplies power to two outlets. I had forgotten that in the past the sound using this for some components was perhaps "too clean," it was thinner and bass heft was a bit diminished.So I re-arranged my power distribution so that the Jr. was fed by one of the outlets in the Snub Station Zero that also feeds the SEWE300B and the ZROCK3. The immediate result powering up was that the sound immediately had better, fuller bass and a touch of warmth and richness I was missing and had attributed to as colorations inherent in my favorite rectifier. For the first time I feel that the Jr. has provided superior sound to that rectifier, there is the tonallity I look for as well as a touch more dynamics and a touch more soundstate width and depth. The SR Purple fuse has helped along these lines too I believe as it has warmed up after about a year in a box.

Now as things season in I expect to be even happier, and satisfied with this (admiitedly expensive) change. And I am convinced that the Jr. is inherently transparent, and any changes to power or isolation can be fully heard and experienced. Quite a device,