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What do you know and how do you like the RCA 5963 Black Plates?

I just rolled a nice set of 1957 RCA 5963 black plates with foil D getters.  I don't have many hours on them yet, but I was surprised at the sound quality and value for the price on the used market.  

I don't know much about this tube, other than it being a substitute for a 12AU7.  What do you know about them and how do you like them?

Thanks!
jbhiller

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jbhiller OP
1,446 posts
 
I think these tubes sound fantastic, especially for the price.  Good ol' made in the USA 50s product.  They have just a nice touch of air on the top end with great imaging and palpable soundstage.  I'm a bit surprised as all of the European made NOS tubes sort of have this "old world, old vines" kind of mysticism behind them--so much so that an ordinary old American RCA was not as valuable.  

I'm curious to see how I like these after 25 hours or so more. 
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