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Alembic Club » Alembic Basses & Guitars » Archive: 2007 » Archive through July 18, 2007 » Input Impedance on an F1X « Previous Next »

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Username: murphbass

Post Number: 1
Registered: 5-2007
Posted on Monday, May 21, 2007 - 7:24 pm:   Edit Post

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.

Username: trip_wamsley

Post Number: 7
Registered: 5-2007
Posted on Monday, May 21, 2007 - 7:37 pm:   Edit Post

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.

Intermediate Member
Username: wayne

Post Number: 144
Registered: 5-2002
Posted on Monday, May 21, 2007 - 8:08 pm:   Edit Post

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

Intermediate Member
Username: worldfamousandy

Post Number: 101
Registered: 3-2004
Posted on Tuesday, May 22, 2007 - 8:00 am:   Edit Post

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
Username: mica

Post Number: 4585
Registered: 6-2000
Posted on Tuesday, May 22, 2007 - 11:03 am:   Edit Post

Input #1 is 1Meg, #2 is 136K.

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