August 4, 2012

  • Prem. 140 Input Tubes, Pt 3

    The third installment of input tubes for the Premier 140 covers the following two types:

    1.  Mullard CV2493 dimple disc getter.  1970 vintage.

    2.  Sylvania JAN 7308.  1967 vintage.

     

    Mullard CV2493 front view                                                                  Mullard CV2493 rear view
         

    Mullard CV2493 with top seam mark typical of Amperex tooling

    Sylvania JAN 7308 front view                                                              Sylvania JAN 7308 rear view showing small halo getter ring
         

     

     

     
    Type Bass Mids Highs Detail Grain Dynamics Sound Stage Avg. Forward* Warmth*
                         
    6922EH 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.00 0.0 0.0
    Amperex Pinched Waist 6922 -1.0 5.0 -2.0 4.0 7.0 0.0 9.0 3.14 -1.0 5.0
    GE Grey Glass 6DJ8 -1.5 2.0 1.0 1.5 2.0 1.0 5.0 1.57 0.0 1.5
    Lorenz PCC88 0.0 0.0 1.0 3.0 5.0 1.0 6.0 2.29 -1.0 0.0
    Mullard CV2493  1.0 2.0 2.0 3.0 4.0 1.0 5.0 2.57 1.0 0.0
    Sylvania 7308 2.0 0.0 1.5 1.0 0.0 1.5 3.0 1.29 1.0 0.0
    		                 

     

    More to follow. 

     

Comments (3)

  • See that "face" logo on the Mullard CV2493? That was the inspiration, when Transformers designed the Decepticons.

  • @rpghero27 - 

    OMG! You're right! And if they didn't use it, it certainly looks like they did. Given a choice, I'll take the Mullard CV2493, however. It is most definitely a special tube.

  • Hey don't laugh. Both these Mullard tubes and vintage 1980s Transformers are hard to find and pricey to boot!

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