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Author Topic: Input Impedance on an F1X  (Read 150 times)

murphbass

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Input Impedance on an F1X
« on: May 21, 2007, 07:24:33 PM »
I've been using an F1X preamp for over 10 years, and I gotta say that it's the greatest!  I get more compliments on my sound, and I have to blame it on the Alembic pre.  
 
I'm thinking about using it for my upright rig as well.  I know a lot of people say don't use tube pre's for upright, but it's worth a shot.  I know I need a ultra high impedance rating on the input (>million ohms?)  Anyone know?  I don't have a manual and I couldn't find it on the site.
 
Thanks!
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trip_wamsley

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Input Impedance on an F1X
« Reply #1 on: May 21, 2007, 07:37:38 PM »
Compliments on your sound?  I'm know the Alembic is great, but I know you probably play as well.  That helps.  As for the impededance, I have no idea.  I have heard of some upright people, err, upright players using some sort of impedance buffer before going into the amp or what-not.  
 
             T
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wayne

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Input Impedance on an F1X
« Reply #2 on: May 21, 2007, 08:08:19 PM »
My 1934 American Standard upright sounded like, well, you know, all scratchy and tinny through every amp I ever tried.  UNTIL I got my F-1X.  Now, it sounds like my bass, only louder. Pizz or arco it doesn't matter.
 
I've used both a Fishman BP-100 and a Schertler Stat.  The tube and the F-1X circuit are the answer (in my humble, distinctly biased opinion).
 
Oh yeah, I asked an electronics guy to look at the schematic on the F-1X and tell me what the input impedence was.... If I recall correctly, he said that input 2 is 1 Meg-ohm and input 1 was a bit more.  I may have that reversed, but anyway, it's at least 1 Meg-ohm, and that's what the Fishman (or almost any piezo I've read about) wants to see.
 
By all means, plug that upright straight into that F-1X and don't look back.  :-D
 
C-Ya.........wayne
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worldfamousandy

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Input Impedance on an F1X
« Reply #3 on: May 22, 2007, 08:00:30 AM »
I have found my best upright sound to be through the F-1X.  I do run it through a Fishman Platinum eq, especially when I need to bring the volume up, simply to be able to eq feedback out.  At home, though, I like it best going straight into that F-1X.  The Schroeder 4X10 is a nice box for upright, too.
 
Andy Calder
www.andycalderbass.com
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mica

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Input Impedance on an F1X
« Reply #4 on: May 22, 2007, 11:03:55 AM »
Input #1 is 1Meg, #2 is 136K.
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