A combo amplifier or combo amp is basically an amplifier with integrated speaker cabinet or the other way around, a speaker cabinet with builtamp section. In common practice, it is not appropriate to plug in a bass guitar into a guitar amp because this could wreak the amplifier. On the other hand, some bass amplifiers, like the famous Fender Bassman, are well suited for use with electric guitars. One of the best attributes of a bass guitar combo amplifier is its portability and less transport as compared to 'head and stack cabinet type' set up.
'''Useful Products:'''
For bass amplifiers, bass response is extended and tone controls are optimized for use with bass guitars, high-end bass amplifiers sometimes include compressor or limiter features, which causes the amplifier to distort when cranked to high volume levels. Some bass amps also features an XLR DI output for patching the bass signal directly into a mixing board. They are also often provided with external metal heat sinks or fans to help keep the amplifier cool.
'''Useful Products:'''
Tube or Solid State
Amplifiers may use vacuum tubes or solid state (transistor) devices, or a mixture of both (hybrid amps).
Tube amplifiers relatively cost much more than amplifiers built with a solid state circuitry. However, the tone produced by a tube amplifier is warmer and edgy than that of a solid state amp. But take note that every now and then you may need to replace the tubes used in the amp as they will wear eventually. A defective or worn out tubes could produce a sound that may not be acceptable to the player's sound preference, take note also that a new set of tubes can cost a decent amount of money. If you won't settle for anything less, then this one's for you.
'''Useful Products:'''
Solid State amplifiers are almost as great as the tubed type one. They are available at a much reasonable prices, and depending on the brand of the amplifier, a properly designed solid state amplifier could sound close enough to a real tube amplifier. To some, solid state amplifiers were most preferred over tube amps because simply for the reason of being less to maintain, particularly if taken out frequently for on the road gigs. Because tube amps inject distortion into the signal, most rock bass players prefer tube amps over solid state because of the warm and edgy distortion sound produced by the tube amplifier.
