Pre amps?

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Fenderfan
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Pre amps?

Post by Fenderfan » Sun Mar 20, 2011 8:14 pm

Was just scouring trade me and saw a jansen pre amp listed for sale http://www.trademe.co.nz/Music-instrume ... 535238.htm . I don't know what this is for, benefits of using a pre amp etc. Can someone enlighten me please?
Cheers, Tim.
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Re: Pre amps?

Post by beagle » Mon Mar 21, 2011 4:08 pm

Those come up every so often on TM.
Here's my take on it.... pls correct me anyone if I'm wrong or have left anything out.
It is used to control the level and sound characteristics of the instrument signal 'before' it reaches the power amp stage.
Essentially you could hook it up to a great big PA power amp and use it like a 'normal' amp.
No idea what it would sound like.
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john
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Re: Pre amps?

Post by john » Mon Mar 21, 2011 5:20 pm

What he said^^^.

You could always contact Jansen. Their tech, John Veldwijk probably designed it, judging by when I imagine it was made. Looks to be the same era as my amp, which he designed .
He is a very friendly guy.

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Re: Pre amps?

Post by Fenderfan » Mon Mar 21, 2011 7:41 pm

Cheers guys, wasn't really in the market for one, just curious what they did, what the purpose of them was. :)
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Re: Pre amps?

Post by foal30 » Mon Mar 21, 2011 8:57 pm

you might consider it as an 'extra' line of EQ
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Re: Pre amps?

Post by Pablo Basso » Mon Mar 21, 2011 9:24 pm

I've been wanting one of these for years to match up with my Jansen SR450T power amp. Don't know what it sounds like either, sub bass and comp/lim - good for 5 and 6 stringers I guess. Don't need it either - got a reasonable vintage HH combo amp.
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Re: Pre amps?

Post by beagle » Mon Mar 21, 2011 11:04 pm

foal30 wrote:you might consider it as an 'extra' line of EQ
Now why didn't I just say that.
The limiter is a handy feature.
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Re: Pre amps?

Post by dannowilso » Tue Mar 22, 2011 7:42 am

I used to use my Sansamp as a pre-amp straight into a 600w PA amp, sounded pretty good.

Essentially what a preamp does is take your low level instrument signal and turns it into a line level signal.
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Re: Pre amps?

Post by martyforrer » Tue Mar 22, 2011 9:33 am

Back in the 80s and 90s there was a fad of having the biggest rig you possibly could (now it's the polar opposite!) This meant using a big stereo PA power amp to drive your cabs. The pre-amp is just the control section that boosts and equalises the signal before it goes to the power amp.

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Re: Pre amps?

Post by timi » Tue Mar 22, 2011 10:58 am

Basically your "normal" bass amp is a preamp and a poweramp slapped together, but they could be separate like this.

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