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Post subject: Changing tubes in Champion 600
Posted: Thu Dec 11, 2008 1:52 pm
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Can i use a 12AU7/5814A pre-amp tube instead of the 12AX7 in
the Champion 600?

Peter


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Post subject:
Posted: Thu Dec 11, 2008 9:06 pm
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Hello Lostindesert,

Yes Peter, you can do it,
but you may loose some volume.
the amps tone should be cleaner.

Cheers.


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Posted: Fri Dec 12, 2008 7:28 am
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Location: uɐʇsıʞɔnuɐɔ 'puɐlʇɐlɟ
The 12AU7 has a gain factor of 19 compared to a 12ax7 with a gain of 100.
That is quit a big drop in gain.

You can read up a bit on gain factor of the different 12a*7 pre-amp tubes here
http://thetubestore.com/gainfactor.html

I'm using a mix of the 5751, 12AT7 and 12AX7 in different pre-amp positions in my amp.
Seems to be working quite nicely.

If you are trying to reduce noise/hum maybe even try something like the
high performance JJ 12AX7. http://tubedepot.com/jj-ecc803s.html
(never tried it myself so no idea if it really does help reduce noise)

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Post subject:
Posted: Fri Dec 12, 2008 3:25 pm
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Mr Bill and peterp,

I did try a 12AU7 but there was to much gain reduction.
I'm now using a JJ/Tesla ECC83S that sounds very nice.
For cleaner sounds i can use the low gain input.


Peter


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Post subject:
Posted: Fri Dec 12, 2008 5:38 pm
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you would lose so much volume it is not funny. i would try a diffrent tube. of the 12ax7 vareity. maybe a tungsol 12ax7


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