RCA 12AU7 Large Gray Plates

RCA 12AU7 Long Gray Plates Top Square-Getter Mid-Late 1950's USA
These were manufactured right after the Large Black Plate (LBP) type during the mid-late 1950's. Construction wise they are identical to the LBP but with gray plates. And, sonically you can expect something between LBP and Clear Tops which is a later version : Less creamy than the LBP and less bright than the Clear Tops.

Quantity  in Stock : Out of Stock!
Price : US$32,00/each ; US$69,00/matched pair
(Add $5,00/each for those in Original Boxes) 

Grade A - The best in the stock. Lowest noise and microphony with the tightest balanced sections we have available. This is typically 10% or often tighter given the large volumes of our stock.
Grade B - Low noise and microphonics with a section balance typically between 15% and 20%, but may be higher depending on available stock.
Grade C - Lowest noise but slightly microphonic. Section balance will be similar to Grade A or B. This grade is only suitable for use in the driver stage of an amplifier, or the output/buffer stage of a DAC or CD Player.


  1. cor.bulsing@outlook.comOctober 20, 2017 at 5:54 PM

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  2. Really nice sounding tube! As described, if you want something in-between the RCA Clear Top and Black Plate this is the tube. It is both clear and warm, bright yet smooth.


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