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Re: 5814 tube substitute? Any 12AU7 OK ?

Hi tubers,

If the "National" 12AU7s have plates that look like 12AT7 (small, one edge rounded off) and have kind of a "frosty" look around the pins where they enter the glass it's an RFT. The plate is the giveaway, al the RFT 12**7 tubes have plates that look like a 12AT7 plate.

Let us know if you would!

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