Tube Amplifiers
frickadella asked:

I 'm. not an engineer, so can someone explain why? design an amp? King with multiple tubes


2 Comments so far

  1. NordicGuru on August 15, 2009 2:18 pm

    It’s better to amplify a signal in multiple stages because one large gain stage usually leads to distortion. Multiple stages allow each stage to do something different. Usually an amplifier can be optimized for noise or power, but not both. So, for example, the first stage amplifies the small signal using a low noise amplifier. The (now bigger) signal then passes through one or more power amplifiers to boost the signal further. Because the signal is already larger the noise added by the power amplifiers has less of an effect on the signal and hence, less distortion.

  2. Bob D on August 16, 2009 1:30 pm

    Tubes and transistors have power ratings (maximum operating power). These devices can be made to operate at higher power than an individual tube rating by connecting tubes in parallel.

    Depending on the type and class of the tube output state, two tubes may be connected in a “push-pull” circuit configuration; thus, requiring two tubes. There may be pre-amp or driver tubes before the output stage.

    Beyond gaining higher output power (louder sound) by paralleling tubes, I don’t think the arrangement will add anything more to tone are overall frequency response—depends on how the circuit is designed, of course.

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