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timmo

Pre Amp...Why

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What are they for? Are they some effect that is needed for a rig to sound better? I don`t really understand what they are about

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For me its simple. I dont have the luxury to always use my amp. Therefore I use a preamp to be able to get the same sound to FOH at every gig. Its an 'always on' thing

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[quote name='lefrash' timestamp='1424527649' post='2697337']
For me its simple. I dont have the luxury to always use my amp. Therefore I use a preamp to be able to get the same sound to FOH at every gig. Its an 'always on' thing
[/quote]So a pre amp, is basically an amp? Sorry for sounding dumb, which i do quite often, but i just don`t really understand what the function of one is.

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Are you talking about an external pre-amp pedal, or the one which is usually part of the amp as a whole?

Technically speaking they are the same thing, although the usage and spec can vary.

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I was just looking at the amps and cabs for sale and saw this. Just didn`t get what the function is, as i thought you would have an amp for all the functions.
http://basschat.co.uk/topic/253503-rare-gt-groove-tubes-bass-preamp-swr/

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A pre-amp pedal is often used to simulate the effect of pushing the pre-amp stage of a valve amplifier so that you get an overdriven effect (by turning up the gain control) - that's bringing in warm harmonics as opposed to unpleasant clipping. If you have a bass amplifier head/combo that's already all valve or has a valve input stage then a pre-amp pedal might be of little use unless your bass doesn't put out enough signal to overdrive the input stage (which AFAIK is pretty unlikely). In the world of solid state amps and the likes of lightweight Class D amps then a pre-amp pedal might well add a nice touch of warmth or grit plus these types of pedals often have a DI out socket allowing you to send a signal to the room PA just in case your bass rig doesn't have that option.

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[quote name='timmo' timestamp='1424528960' post='2697358']
I was just looking at the amps and cabs for sale and saw this. Just didn`t get what the function is, as i thought you would have an amp for all the functions.
[url="http://basschat.co.uk/topic/253503-rare-gt-groove-tubes-bass-preamp-swr/"]http://basschat.co.u...ass-preamp-swr/[/url]
[/quote]

Ah, I see.

Most bass and guitar amps come in two sections. The 'power amp' will amplify the signal to speaker moving voltages, usually controlled by a knob marked 'volume'. However, a power amp will expect a certain level of input signal to work most efficiently, so the primary function of a 'pre-amp' is to boost the tiny voltage produced by a pickup to a level which can make the power amp run properly. This is usually controlled by a 'gain' knob, which refers to the voltage increase (or gain) to the original signal. The simplest form of pre and power amp would be just a gain knob and volume knob.

Of course EQ and other additional circuitry is very useful, so is regularly included in any pre-amp.

So the pre you linked to would be designed to be hooked up to a separate power amp. Most bass amps are just pre and power amps in one box.

Pre-amp pedals are [i]effectively[/i] the same thing, but are often designed to be used before the pre-amp (so are in fact pre-pre-amps) and may not boost the signal enough to drive a power amp. These really exist as each design will have a different character to the sound, so many will use, for example, a VT Bass to sound like an Ampeg, into the pre-amp of a Markbass which can be EQ'd for the room, into the clean power amp of the same unit to give control of the output volume without affecting the pre-determined character too much!

I think that's right, anyway. :)

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[quote name='timmo' timestamp='1424528960' post='2697358']
I was just looking at the amps and cabs for sale and saw this. Just didn`t get what the function is, as i thought you would have an amp for all the functions.
[url="http://basschat.co.uk/topic/253503-rare-gt-groove-tubes-bass-preamp-swr/"]http://basschat.co.u...ass-preamp-swr/[/url]
[/quote]

Quite a few of us use pro sound grade power amps in our bass rigs, for one reason because virtually no bass amps make enough power to satisfy some people. Since that power amp doesn't have tone controls and since it typically wants a higher level input signal than our basses provide, a standalone preamp like that becomes necessary. The often large-ish form factor also leaves lots of room for extended functions that are less often seen in integrated bass amps. Floor pedals tend to just provide another tonal flavor, and they can be very handy for getting "your sound" through someone else's rig as well.

Edited by Passinwind

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[quote name='lefrash' timestamp='1424527649' post='2697337']
For me its simple. I dont have the luxury to always use my amp. Therefore I use a preamp to be able to get the same sound to FOH at every gig. Its an 'always on' thing
[/quote]

This is it for me too. Luckily my pre-amp is the same as my amp, Aguilar Tonehammer, so I always get my sound no matter what I`m using. Great for recording too, plus if your amp fails having the pre-amp going to the PA gets you out of the mire for the gig.

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