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RE: RCA windmill 5751

Posted by Mendel on July 8, 2012 at 17:18:00:
Nothing sounds quite like the windmill, but if you want rich, warm sound I recommend the Sylvania triple mica grey plate 5751. Still quite reasonable (less than half the price of the windmill) and available. I find the other Raytheon 5751, the blackplates with the square getter, even harder to find than the windmill and just as pricey. The Raytheon blackplate 12ax7 is very good, but the older variety with the square getter is pretty much extinct now, and the 1960 version with the round getter (often labeled "Baldwin") is now commanding $50+ per tube on e-bay. Very good tubes.
The Tung Sol 5751 is very good also, but also getting rare and pricey. Cheapest vintage 5751 are the GE grey plates, and they are rich and warm, but the resolution does not equal other vintage 5751s IMO. RCAs 5751s may be worth a try and are still fairly reasonable.
Good luck hunting.