If you use a preamp and a power amp from different companies, it can be a challenge to find a combination that matches well. You can also use the preamp signal from a one amp and feed it into the power amp of another. A preamp may be built into an instrument, a pedal, a rackmountable unit, a mixer, a sound card, or a variety of other forms; and a preamp is also the input stage of every amp "head". However, it does not have the facility of switching off the speaker outputs. About the amp: At this point, I have been using this amp for some time and in many situations, and let me tell you, this thing is great. Any amp with an fx loop can be used as solitary power amp (or preamp). I like to run AIABs or amp modeling pedals directly into a power amp via the fx return jack from time to time (less and less lately). The amp features a 68 watt power amplifier and a 12" Celestion speaker, which can deliver some serious power. Having said that, many audiophiles have told me that it is easier to match a tube preamp with a solid-state power amp than it is to match a solid-state preamp with a valve power amp. I am considering using an integrated amp as a preamp. Hi everyone. The preamp section is … Onother option (after running the LSA for a week, or so) would be to test and possibly replace/upgrade the preamp section tubes. The sound of various 6922 tubes is all over the map, from my experience, using them as input and/or preamp tubes. This means that the signal would be continuing to be sent to the speaker terminals, but with no electrical resistance (or whatever it is) from speakers. Sometimes people confuse preamps with DI boxes; this is an easy mistake because so many devices include the functions of …