Class A/B


electrical term, cl-ss a/b amplifier.

a cl-ss a/b amplifier is also called a psh/pull amp. cl-ss a/b amplifiers have 2 amps, one to push the speaker out (+), the other to pull it in (-). in guitar amps that use tubes, this means that one tube, a driver tube inverts the signal polarity before it reaches the b side.

a cl-ss a amp pushes and pulls the speaker, and thus must do more work. most commercial (in home) amps (stereo receivers, etc.) are cl-ss a amps. cl-ss a/b is generally used in guitar amps over 30 watts, high powered b-ss amps, and professional power amps. cl-ss a/b generally delivers the same power at double the impedance. so if an amp gets 100w per side @ 4 ohms, then it will generally get 200w bridged mono @ 8 ohms. this is rarely 100% true in practice.

cl-ss a/b is also called “bridging” an amp (transistor amps generally).
“fender twins use 4 6l6s in a cl-ss a/b circut to deliver 85 w rms @ 4 ohms… in other words, they’s pretty d-mn clean boss.”

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