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I ask, because I just received a lot of 12AU7s, several RCAs in the bin, and the plates look more like CARBON or Nickel plates than black.
For instance, the Sylvania black plates are just that, deep black.
But, the RCA plates look almost just like GE/Ken Rad Nickel or Carbon plates.
Does anyone know more about these plates, and are they actually Nickel plates?
Thanks!
Andrew
Follow Ups:
I think the question is;
Black plate tubes, black metal or black coating?
I think the link provides the answer.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
According to some reading I have done the GE 5 layer plates were actually developed by TI (Texas Instruments) and accomplished by explosion welding.
Most black plates are carbonized, IIRC.
And while cooling is paramount, it is interesting to look at the 6SN7 family. Early models had the plates parallel to each other. Later models had the plates staggered, and then even later models had the "triangular" plates, actually rectangular but mounted at an angle to each other, presumably for better dissipation.
Also the use of cooling fins on grid rods and having the rods made of that copper colored material all were supposed to increase cooling capacity. Some tubes even have the screen support rods with that material.
.
Have Fun and Enjoy the Music
"Still Working the Problem"
Have you ever noticed that black plate tubes have no holes in the plate structure?
Nobody ever went broke underestimating the intelligence of the American public
H. L. Mencken
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