The band audition is just around the corner. You need the right equipment to land the job. Should you choose the always reliable tube amp, or the sleek and efficient solid-state amp?
First, Lets start with a discussion of the functions and applications of preamps and power amps. A preamp is the first thing your guitar signal meets when plugged into any kind of amp. Its first task is to boost the relatively weak signal of your guitar (about .0025 volts) up to something more substantial (about 1 volt). This is usually referred to as the gain circuit. Next up is the processing circuit, where the signal is shaped via the tone controls. Additionally, effects such as reverb and chorus may be added at this point, along with “line out” and “line in” points for the user to add outboard effects. Preamps may consist of several gain and processing circuits to create the overdrive guitarists live for, but remember that the signal is still too weak to drive a speaker.
So, how to jiggle the speaker? Enter the power amp, or output circuit. Its sole function is to bulk up the preamp’s signal to 8 volts or more and add the appropriate wattage to jiggle the speaker.
Both preamps and power amps can be tube or solid-state, but with technology advancing all the time, why doesn’t solid-state circuitry make tube circuitry obsolete? C’mon, tube amps are heavier and more fragile than their solid-state counterparts, tubes are expensive to replace, and any engineer will tell you that solid-state amplification is far cleaner and more efficient. But the complex distortion and compression generated by tube circuits (even in their cleanest modes) create “something special” which has made even the very best solid-state amps seem hard, brittle, or harsh in comparison.
However, the past decade brought about some fascinating developments in integrated chip circuitry, most particularly employing “modeling technology” where the complexities of dozens of tube circuits can be cloned and put into a single, small unit. Plug one of these modeling preamps into a good solid-state power amp and a pair of speakers, and you can be sure to turn the heads of even the most skeptical engineers.
In the studio, there is no denying the ridiculous flexibility of a premium multi-effects processor packaged with a cavalcade of unique preamp models, while at the same time, many professional players still believe tubes, and tube amps’ combination of ease of use and unique musical response cannot be denied.
So is one amp really better than the other, or is it just a matter of preference from one musician to another? I believe the answer is YES. No, not the band, but the idea that as a consumer you work with whatever you can afford and utilize gear that ultimately meets your needs.
Personally, I like the idea of a cost effective studio solution with an array of options at my disposal, such as Digidesign’s Eleven Rack, but at the same time if you called me right now to do a live gig, you might be surprised to see me lugging a giant Fender Hot Rod Deville behind me.
The Brehms Blogger

