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Old 08-29-2006, 07:50 PM   #1
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Microphone preamp ?

Does anyone know of schematics for a nice tube-based microphone
preamp ? Preferably 2 channels with phantom power.

I've found this one so far :

http://www.tangible-technology.com/tubes/1566/1566.html

Any comments as to the suitability of running microphones through
tubes would also be appreciated.

Paul
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Old 08-29-2006, 08:46 PM   #2
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Quote:
Originally Posted by Paul P View Post
Does anyone know of schematics for a nice tube-based microphone
preamp ? Preferably 2 channels with phantom power.

I've found this one so far :

http://www.tangible-technology.com/tubes/1566/1566.html

Any comments as to the suitability of running microphones through
tubes would also be appreciated.

Paul
Not a schematic, but Hamptone sells this kit:

http://www.hamptone.com/HVTP2.htm

steve
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Old 08-29-2006, 10:44 PM   #3
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http://www.frontiernet.net/~jff/pult...MB1_proto.html
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Old 08-30-2006, 03:26 AM   #4
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Here are a bunch of them:

http://www.waltzingbear.com/Schematics/Schematics.html
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Old 08-30-2006, 09:04 PM   #5
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Thanks for the links, lots of interesting stuff to read. I've found many
solid state circuits, which look easy enough to build, but not that many
tube circuits. The Pulteq is more or less what I was looking for, a simple
tube circuit to study.

I just found the following, which looks like it would be hard to beat. A
tube mic preamp (with ss power supply) that meets all my requirements :

http://www.gyraf.dk/gy_pd/g9/g9pd.htm

except that it uses European parts which might be a slight inconvenience,
my living in North America...

This should keep me busy for a while.

Paul
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Old 08-30-2006, 10:20 PM   #6
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Go to the jensen transformer website and check those out. One thing is if you build them go as close to the specs as you can. Whatever mic pre you build use an input transformer. The Cascodes are very nice.
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