Conn 12AU7 RCA Black Plates

Discussion in 'Tube Audio' started by juno, Jan 5, 2019.

  1. juno

    juno Super Member

    Messages:
    1,049
    Location:
    Pembroke Pines, FL
    I just ordered 4 of these for a preamp. They are RCA Black Plates branded Conn. I figure these are a great all around tube? Anyone have any input on how these sound? Never mind the Conn....but RCA 12AU7 black plates in general? Thank you! Purchased from a reliable and trustworthy supplier
     

     

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  2. apachef1

    apachef1 Well-Known Member

    Messages:
    888
    Location:
    Southbury CT
    I have an RCA 7025 black plate and these are the best RCA offered, the 12AU7 black plate equally so, Fat midrange sound with the tight bottom end not airy on the top like a philips or amperex, just a nice balance.
     
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  3. juno

    juno Super Member

    Messages:
    1,049
    Location:
    Pembroke Pines, FL
    Thank you for the reply. I had heard the cleartops are a little bright, so opted for these. I guess I will find out in a week once they arrive!
     
  4. UncleBingo

    UncleBingo AK Subscriber Subscriber

    Messages:
    1,503
    They should be very good. Probably selected for low microphonics by Conn. Expensive to send organ tech out to replace tubes...
     
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  5. apachef1

    apachef1 Well-Known Member

    Messages:
    888
    Location:
    Southbury CT
    I have cleartops and they are quite good but very hot on the top-end can get a little messy on the top-end. The black plates have a clean presentation, nothing extra added on top. Shoud sound quite fine in your application.
     
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  6. mcgjohn

    mcgjohn Active Member

    Messages:
    133
    Location:
    Chicago area
    don't forget any of the organ mfgr tubes were tested for noise and sonics before being used in production. so those lots of tubes all received a secondary inspection/test/listening before being used.

    The RCA clear tops are also nice tubes.
     

     

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  7. juno

    juno Super Member

    Messages:
    1,049
    Location:
    Pembroke Pines, FL
    Got them. They are great tubes. 1957 RCA
     
  8. apachef1

    apachef1 Well-Known Member

    Messages:
    888
    Location:
    Southbury CT
    RCA was on top of their game back in the day.
     

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