Tubes Asylum

Philips E180CC (alleged eq. to 12AT7)--anyone know it?

70.162.135.70

jeffreybehr

They sound just fine in the frontend of my WAVAC MD-805ms, replacing 5751s.

Here it is below a Mullard gray-ladder-plates CV4024 and (top) a new JJ ECC81.

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Tin-eared audiofool, large-scale-Classical music lover, and damned-amateur fotografer.
William Bruce Cameron: "...not everything that can be counted counts, and not everything that counts can be counted."

Follow Ups:

TY both VM. I haven't noticed a difference in gain among the four... - jeffreybehr 15:13:43 10/11/14 (1)
...(including the 5751); I think I'll measure it this aft. Will report back.
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Tin-eared audiofool, large-scale-Classical music lover, and damned-amateur fotografer.
William Bruce Cameron: "...not everything that can be counted counts, and not everything that counts can be counted."
- So I measured five '12AT7s'. - jeffreybehr 16:34:31 10/11/14 (0)
  Measured these installed in my WAVAC MD-805ms driving (full-range) only the MR and treble of my Serenity Super-7s. Used broadband pink noise; measured with A-weighting to reduce the affects of low-frequency traffic noise, at the listening position. Amps' level controls (already set to c. 9:30-o'clock) were tweaked slightly to equalize the 2 channels' output levels using the original GE 5751s. That setting proved excellent--the average left-to-right level difference averaged 0.1dB (no, I can't measure noise that accurately, but that's the result of the arithmetic using raw numbers to the 1/4dB).
  
  -----------------------------L--------R-------Av.
  GE5751........................75.........75..........75
  Mullard CV4024.........73-1/2...73-3/4..73-5/8
  JJ ECC81......................73.......72-3/4...72-7/8
  Old Tung-Sol 12AT7..72-3/4...72-3/4..72-3/4
  Philips E180CC...........71-3/4...71-1/4..71-1/2
  
  FWIW.
  ----------
  Tin-eared audiofool, large-scale-Classical music lover, and damned-amateur fotografer.
  William Bruce Cameron: "...not everything that can be counted counts, and not everything that counts can be counted."
RE: Philips E180CC (alleged eq. to 12AT7)--anyone know it? - FenderLover 19:10:57 10/10/14 (2)
Quick look at the tube data, E180CC has mu closer to the 12AY7.
- RE: Philips E180CC (alleged eq. to 12AT7)--anyone know it? - ecline6 23:12:21 10/10/14 (1)
  The E180CC is almost identical to the 7062. I have many Amperex 7062's and they are a very good sounding tube.
  The E180CC/7062 is much more like a 12AV7 than a 12AY7.
  The Philips E180CC is more analytical in my amps than the Amperex 7062 and less to my taste than the 7062 .... but less microphonic.
  
  Edits: 10/11/14
  - RE: Philips E180CC (alleged eq. to 12AT7)--anyone know it? - Palustris 08:58:38 10/14/14 (0)
    7062/E180CC: mu = 46, gm = .0064 A/V, rp = 7.2k, Pp = 2W,
    
    Here are a few more variations to the 12A*7/ family to compare:
    
    I prefer the 12AV7 with its low Rp and higher Gm.

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