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    Funky National branded 7199 tube

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    Sal

    Posts: 222
    Join date: 2009-02-05
    Location: Central New Jersey Dynaco-ST70.com

    Funky National branded 7199 tube

    Post by Sal on Sun Jun 07, 2009 12:17 am

    This week I received a ST-70 to rebuild. In testing the tubes I found this funky National 7199 tube. Its probably a 6U8 or a 6GH8 with attached printed circuit board swapping the 3 pins.

    Did you ever see such a tube? You can see on the top photo the original tube pins are offset to the new pins on the pcb.

    Regards,
    Sal


    GP49

    Posts: 501
    Join date: 2009-04-30

    Re: Funky National branded 7199 tube

    Post by GP49 on Sun Jun 07, 2009 1:33 am

    Never have seen one but I like the circuit board...

    Bob Latino
    Admin

    Posts: 1970
    Join date: 2008-11-26
    Location: Massachusetts

    Re: Funky National branded 7199 tube

    Post by Bob Latino on Sun Jun 07, 2009 10:35 am

    Yes - that small board looks like a custom made 7199 to 6GH8 adapter. As most Dynaco users know there is no direct replacement for a 7199 tube although a 6GH8 or 7687 tube may be used in it's place if a pin adapter is used. Both the 7199 and the 6GH8/7687 have similar characteristics and the the pin out is the same on the triode section on both tubes. The pentode section, however, has a different pin out. Since the 7199 tube is not made any more and as the remaining supply of these tubes slowly dries up, these adapters will become more common. See below for the pentode section pinout differences between the two tubes.

    Bob



    Tazsmonn

    Posts: 18
    Join date: 2009-01-18
    Age: 52
    Location: Richfield (S. Minneapolis) Minnesota

    Yes

    Post by Tazsmonn on Mon Jun 08, 2009 5:09 pm

    Ordered a set in the 90's & they looked just like this.

      Current date/time is Sun Nov 23, 2014 4:50 pm