Tubes Asylum

Trying to figure out the code on a 7062 tube.

174.18.28.49

John PA

It is marked Amperex Holland. Code is IV5 49D4

iBasso DX100,DX50 DX90. Chord Hugo. HiFiman 901s balanced. RSA Intruder, The Lightning. Fostex TH900 balanced, HE1000, HE-6, 560, 500, JH13 Pro balanced. Lyr2, Audeze. Balanced mostly with Whiplash cables. Photo gallery: www.pbase.com/jamato8

Follow Ups:

RE: Trying to figure out the code on a 7062 tube. - Tre' 18:40:10 03/17/16 (5)
Could the 4 at the start of the second line be a delta?
If so then it was made in Heerlen Holland. factory | year | month | week
Made the 4th week of April, 1969
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
- http://www.tube-classics.de/TC/Tubes/Valvo/Phlipscode.htm (Open in New Window)
Edits: 03/17/16
- So this other tube is, - John PA 22:17:09 03/17/16 (3)
  triangle, 6K3 1966, Nov. 3rd week.
  
  iBasso DX100,DX50 DX90. Chord Hugo. HiFiman 901s balanced. RSA Intruder, The Lightning. Fostex TH900 balanced, HE1000, HE-6, 560, 500, JH13 Pro balanced. Lyr2, Audeze. Balanced mostly with Whiplash cables. Photo gallery: www.pbase.com/jamato8
  - RE: So this other tube is, - FenderLover 03:53:25 03/18/16 (2)
    Yup. But, think the manufacturer code is closer to "Delta." IIRC, "triangle" is for another manufacturing location.
    
    8^)
    - triangle = Philips. Copenhagen, Denmark - FenderLover 07:03:23 03/18/16 (1)
      Manufacturer site link.
      http://frank.pocnet.net/other/Philips/PhilipsCodeListAB.pdf (Open in New Window)
      - RE: triangle = Philips. Copenhagen, Denmark - John PA 21:54:50 03/19/16 (0)
        
        In Reply to: RE: triangle = Philips. Copenhagen, Denmark posted by FenderLover on March 18, 2016 at 07:03:23
        
        Philips, Heerlen is the symbol that matches.
        
        iBasso DX100,DX50 DX90. Chord Hugo. HiFiman 901s balanced. RSA Intruder, The Lightning. Fostex TH900 balanced, HE1000, HE-6, 560, 500, JH13 Pro balanced. Lyr2, Audeze. Balanced mostly with Whiplash cables. Photo gallery: www.pbase.com/jamato8
- Yes, you are right, - John PA 18:42:49 03/17/16 (0)
  it is a triangle not a 4. Thank you.
  
  iBasso DX100,DX50 DX90. Chord Hugo. HiFiman 901s balanced. RSA Intruder, The Lightning. Fostex TH900 balanced, HE1000, HE-6, 560, 500, JH13 Pro balanced. Lyr2, Audeze. Balanced mostly with Whiplash cables. Photo gallery: www.pbase.com/jamato8
RE: Trying to figure out the code on a 7062 tube. - FenderLover 18:36:13 03/17/16 (2)
My WAG:

IV5 = 5th iteration of 7062.

"4" of 49D4 is delta = Heerlen, Holland.

9D4 = 1959 (or '69), fourth week of April.
- RE: Trying to figure out the code on a 7062 tube. - Tre' 18:41:26 03/17/16 (1)
  1969.
  
  "Tubes before 1960 have a second line with only 3 digits."
  
  Tre'
  Have Fun and Enjoy the Music
  "Still Working the Problem"
  - http://www.tube-classics.de/TC/Tubes/Valvo/Phlipscode.htm (Open in New Window)
  - Thanks to both of you! - John PA 18:44:18 03/17/16 (0)
    Great weather in Tucson, clear, no clouds and blue skies.
    
    iBasso DX100,DX50 DX90. Chord Hugo. HiFiman 901s balanced. RSA Intruder, The Lightning. Fostex TH900 balanced, HE1000, HE-6, 560, 500, JH13 Pro balanced. Lyr2, Audeze. Balanced mostly with Whiplash cables. Photo gallery: www.pbase.com/jamato8

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