Here is the whole range of the 12AU7 types ever manufactured by Tung-Sol Lamp Works, USA : The Black Glass Black Plates type of late 1940's, the Black Glass Gray Plates type of early 1950's, the Clear Glass Long Gray Plates D-Getter type of mid-late 1950's and the Clear Glass Large Gray Plates O-Getter type of early-mid 1960's... Each type has its own sonic signature specifically but all share one greatest common divider : Good Sound!

In general the Tung-Sol's have smoother upper end compared to RCA Clear Tops. The D-Getter types have good resolution and transparency with nice tones whereas the later O-Getter types are on the more neutral side. The most sought-after ones are the rare Black Glass types.

The larger part of the Black Glass and other D-Getter types came as the Hickok Elect. Instr. Co. spare parts supply that we recently acquired. These are mostly in well stored original boxes with a packing date of June 1962. Besides the few other American brands, the Hickok's supply includes a larger amount of the pre-1963 RCA Clear Tops as well.

TUNG-SOL JTL 12AU7 Black Glass Black Plates Late 1940's in white and original boxes

Quantity in Stock : Out of Stock!
Price :  Grade A @ US$79,00/each ; US$163,00/matched pair
           Grade B @ US$69,00/each ; US$143,00/matched pair

           Grade C @ US$39,00/each ; US$80,00/matched pair


TUNG-SOL JTL 12AU7 Black Glass Gray Plates Early 1950's in white and original boxes
Quantity in Stock : Out of Stock!
Price : Grade A @ US$57,00/each ; US$119,00/matched pair
          Grade B @ US$51,00/each ; US$107,00/matched pair
          Grade C @ US$32,00/each ; US$65,00/matched pair


TUNG-SOL JTL 12AU7 Clear Glass Long Gray Plates D-Getter mid-late 1950's in white and original boxes
Quantity in Stock : 8 pcs
Price :  Grade A @ US$32,00/each ; US$68,00/matched pair
           Grade B @ US$26,00/each ; US$56,00/matched pair
           Grade C @ US$14,00/each ; US$30,00/matched pair


TUNG-SOL  12AU7 Clear Glass Large Gray Plates O-Getter mid 1960's in white boxes
Quantity in Stock : 15 pcs
Price :  Grade A @ US$26,00/each ; US$55,00/matched pair
           Grade B @ US$20,00/each ; US$45,00/matched pair
           Grade C @ US$9,00/each ; US$20,00/matched pair

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. I purchased TUNG-SOL JTL 12AU7 Black Glass Gray Plates Early 1950's and used them as phase splitter in my JADIS JA200 poweramp, which I modified with teflon caps bypass and silver-copper hybrid signal wire. These tubes brought me back the magic of my original Jadis, creamy euphonic sound without compromise on speed and extension thanks to the mods.
    Highly recommended
    Richard Rouquet

  2. ınanılmaz bır kombınasyon ve bu ısın duayenı sagğolun kaoral bey

  3. Bought a pair of the clear glass Tung Sols. They are still amazing tubes silky & creamy. Wish I had bought a pair of black glass when they were available!
    I highly recommend these tubes and Koray still has some.

  4. I bought 2 of the 1950-version, to my Prima Luna. Vow - What a heavy bass!! Even at lowest level, this has a way of making electric guitars and vocals, play like they are in your living room. While the bass is even more astonishing! There is nothing like it!!!


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