12AU7 sub in Cornet

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  • Newbie
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12AU7 sub in Cornet
« on: 8 Dec 2004, 05:09 pm »
Can I use E80CC in place of 12AU7 in Cornet?  Thanks in advance!


12AU7 sub in Cornet
« Reply #1 on: 8 Dec 2004, 06:39 pm »
Another similar question for substitution ... there was much talk on tube forums about swapping a 5751 in place of a 12AX7 (after reading Joe's Tube Lore at the Asylum: http://www.audioasylum.com/scripts/d.pl?audio/faq/joes-tubes.html.

But it doesn't work everywhere.

Anyone have luck with this exchange?



  • Jr. Member
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« Reply #2 on: 8 Dec 2004, 11:57 pm »
If you search on"5751" in this circle, you'll find some comments.  In the end, I preferred the sound of the 12AX7.  I found the 5751 to be a bit dry sounding - not quite as deep in the bass.  But others have liked the 5751.  I didn't notice much difference in gain, but I was using a MM cartridge.


  • Jr. Member
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    • Galaxy SET Labs
5751 in Coronet
« Reply #3 on: 9 Dec 2004, 02:28 am »
If I remember correctly that is the low noise 12AX7 variant.  I'm using it--works great.  No microphonics, very clean sound.


12AU7 sub in Cornet
« Reply #4 on: 9 Dec 2004, 02:44 am »
I started out with NOS GE 5751's in my Cornet.  I loved the mid and highs - just absolutely natural sounding and worked great with my AKSA pre- and amp.  However, there was no bass - no low extension - nothin'.  Could be a gain issue; could be a brand issue, but I swapped them out for Sovtek 12AX7LPS.  They're not quite as smooth in the mids, but the bass is rock solid and rich.


12AU7 sub in Cornet
« Reply #5 on: 9 Dec 2004, 05:15 am »

I can't find enough data on this tube.  Looks similar.  Might work ok.  

jh :)


6085 = E80CC
« Reply #6 on: 9 Dec 2004, 05:42 am »
Here is a complete E80CC datasheet:


This looks like a cool tube.  Let us know how it works.



12AU7 sub in Cornet
« Reply #7 on: 10 Dec 2004, 02:44 am »
Curves looks good, everything similar except one very important parameter: the Vkh.  E80CC specifies 120V max, not enough for the Cornet design.  The 12AU7 is good for 180V and the 6SN7 for 200V.  You need a really good heater insulation to prevent breakdown.

jh :)