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Hep needed to ID vintage tube

Discussion in 'Radio and Wireless' started by Scentral, Apr 30, 2018.

  1. Scentral

    Scentral

    5
    0
    Feb 12, 2018
    Hi All and thanks in advance.
    I have a tube from a 1940's guitar amp. No markings on the glass at all. I'm used to seeing tube info printed on the glass itself (6V6, 12AX7, etc..), but nothing here. Written on it's base is, RCA Radiotron Made in the USA. It's a cokebottle style tube. Only other thing it printed is Y6E. Lower half is mirror coated.
    Thanks! IMG_3664.jpg IMG_3659.jpg
     
  2. Alec_t

    Alec_t

    2,691
    712
    Jul 7, 2015
    Looks like a double diode.
     
    kellys_eye likes this.
  3. Minder

    Minder

    2,871
    594
    Apr 24, 2015
    Rectifier tube often can be replaced by silicone S.S. version in some applications.
    M.
     
    davenn likes this.
  4. kellys_eye

    kellys_eye

    4,281
    1,144
    Jun 25, 2010
    Double diode to me too - possibly and AZ1
     
  5. duke37

    duke37

    5,249
    723
    Jan 9, 2011
    There are lots of double rectifiers on an IO base 5U4, 5V4, 5Y3, 5Z4, GZ32, GZ33, GZ34, 5R4(GY), AZ31, U183, U50, U52, U54, EZ35, U147 etc. Some of them are directly heated and some indirectly heated.

    What is the heater voltage supply?
    The 5U4 or 5R4 are perhaps the most likely, both 5V heater/filament.

    connections
    1 M
    2 h
    3-
    4 a1
    5-
    6 a2
    7-
    8 h,k
     
    Last edited: Apr 30, 2018
    davenn likes this.
  6. duke37

    duke37

    5,249
    723
    Jan 9, 2011
    Here is some data for rectifiers."Electronic Designers' Handbook" Landee, Davis, Albrecht.

    imgRect001.jpg
    The scale on the left is rectifier peak resistance.
     
  7. Scentral

    Scentral

    5
    0
    Feb 12, 2018
    Thanks so much everyone for your posts/assistance. I think it is a 5Y3 rectifier tube. Thanks again!
     
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