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Got some new tubes today! A couple more Ken Rad 12ax7 with the Carbon Nickel plates. LOVE EM. I now have a quad, and plan to buy as as many good ones at decent prices as I can find. I like them that much.
But, I had to pit them up against a Joe Tube Lore legend. I also received a couple of the Gold Label Sylvania black plate triple mica 5751's.
NICE, NICE, NICE sounding tube! It is a very CLOSE race here. I am not sure if the Sylvania is winning, but it certainly deserves its rep. As far as 5751's go, yeah, this is the best I have heard. Better than the other handful of 5751 jewels in my collection.. that is, several Raytheon Windmill getter black plates, GE 5 stars, and at least a half dozen JAN GE 5751s, that for some reason I have a CRAZY love affair with. Kevin Deal got me started on that affair when he sent me my first GE green silkscreen military 5751.
Andrew
Follow Ups:
I'm guessing you're putting a 5751 into an ECC83 hole.
The one thing about comparing tubes that people don't talk about enough how well the tube tests before they made the comparison. If the two tubes measure quite different it's gonna skew the test.
Tube Lore is fun, but it's got some real problems. My biggest pet peeve is the Amperex Pinched Waist 6922. It states that it had a pinched waist to reduce microphonics. Well if that's true, it didn't work, and they stopped doing it pretty quick. PW Amperex are the MOST microphonic 6922's they ever made. Horrible.
They didn't stop making it that way to make it worse, they stopped making it that way to make it better. These were military contracts, and a lot of money was on the line. The thought common in tube rolling that earlier or rarer is better flys in the face of logic.
There are cases where that's true like earlier 5751's having a triple mica. But double mica 5751's aren't very susceptible to microphony anyway.
The very first Siemens 6922's were a disaster. I have a bunch of them in Air Force boxes from 1962. Trash. Bad triode balance that gets worse quickly. Noisy. But the thing we have to remember is they were just learning how to make them.
Sorry to ramble. Didn't mean to hijack your topic. Tell us how they sound.
Hi Kevin...you are right.. we are talking about putting 5751 into an ECC83 hole.
One of the other things that I have noticed, and I think you may have nailed one of the reasons (how it measures), is how different the SAME tube model sounds. The now dozen or so of those GE double mica grey plate JAN 5751's, and there are examples that sound great, others that are just okay.
Andrew
Edits: 04/28/15
Are these pre-GE days (1945)? I thought the earlier Ken-Rads all had horseshoe getters. Maybe these do, but the angle makes them look Halo-ish.
I also don't know much about 12Ax7s.
Observe, before you think. Think before you open your yap. Act on the basis of experience.
After GE bought Ken Rad, Ken Rad still made a unique 12ax7 in the Owensboro plant. It was made in 1949, 1950 and 1951 only, and has Carbonized Nickel Plating. The getter structure is also unique to the Owenboro facility.
So, yes it is technically a GE, but GE kept the Ken Rad name, and the Ken Rad construction practices. The Nickel plate, sometimes called Carbon, Silver or Pewter, or even some just say Black Plate, is very rare and desirable.
Andrew
And yes, it is the angle. Definitely NOT halo getters.
Andrew
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