1. Time for some upgrades in server hardware and software to enhance security and take AK to the next level. Please contribute what you can to sales@audiokarma.org at PayPal.com - Thanks from the AK Team
    Dismiss Notice

Help to ID a tube

Discussion in 'Tube Audio' started by Hi Fi and I, Jul 10, 2018.

  1. Hi Fi and I

    Hi Fi and I Member

    Messages:
    64
    Hi, please help me to ID this tube:
    Thank you!
     

    Attached Files:

     

    Please register to disable this ad.

  2. Hi-FiGuy

    Hi-FiGuy AK Subscriber Subscriber

    Messages:
    579
    Location:
    Southern California
    That looks like a 5U4G rectifier, it could be a 5R4G
     
    Pio1980 likes this.
  3. knockbill

    knockbill Addicted Member

    Messages:
    7,857
    Location:
    SE PA
    Last edited: Jul 10, 2018
    Dswankey likes this.
  4. GregBilodeau

    GregBilodeau AK Subscriber Subscriber

    Messages:
    67
    Location:
    Edmonton, AB Canada
    I would bet that it is a 5U4G

    Gregb
     
    Pio1980 likes this.
  5. arts

    arts Super Member

    Messages:
    3,832
    Location:
    Qc, Canada
    Pio1980 likes this.
  6. gadget73

    gadget73 junk junkie Subscriber

    Messages:
    37,019
    Location:
    Southern NJ
    5U4G or maybe (I doubt it) A 5Y3. Plate structure looks too long to be a 5Y3 though.
     

     

    Please register to disable this ad.

  7. Hi Fi and I

    Hi Fi and I Member

    Messages:
    64
    Thank you!
     
  8. knockbill

    knockbill Addicted Member

    Messages:
    7,857
    Location:
    SE PA
    HA,,, got one outta two anyways!!! 5U4 could be a good guess,,, match the plates to a known 5U4 and see how it tests..
     
  9. primosounds

    primosounds Powered with pure tube sounds. Subscriber

    Messages:
    2,804
    Location:
    Terra, 21st century CE
    Put the tube in the freezer for a few minutes and when you take it out check on the side for the tube designation. You only have a few seconds when the numbers will be visible.
     
    soundmotor likes this.
  10. knockbill

    knockbill Addicted Member

    Messages:
    7,857
    Location:
    SE PA
    5R4,,, 5U4,,, 5V4 for comparison... 5R4 is missing teh key...
     

    Attached Files:

  11. Pio1980

    Pio1980 AK Member Subscriber

    Messages:
    27,018
    Location:
    Eastern Bamastan

     

    Please register to disable this ad.

  12. EastPoint

    EastPoint Factory Code No. 4200 Subscriber

    Messages:
    4,667
    Location:
    Milwaukee, WI
    That’s a 1952 RCA 5U4G. A 5Y3 would be smaller and one from that era wouldn’t have the coke-bottle glass. An RCA 5R4 from that era would probably have a brown base and would look different. A 5V4 would be smaller and would have a different internal structure. A 5Z3 has four pins instead of the octal base.
     
    Pio1980 likes this.
  13. soundmotor

    soundmotor super modified Subscriber

    Fogging it with your breath sometimes works also.
     
    primosounds likes this.

Share This Page