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2. Output transformerless - Wikipedia

   en.wikipedia.org/wiki/Output_transformerless

   Output transformerless (OTL) is a type of vacuum tube audio power amplifier, which omits an output transformer for the purpose of greater linearity and fidelity. Conventional vacuum tube amplifier designs rely upon an output transformer to couple the amplifier's output stage to the loudspeaker .

3. Valve amplifier - Wikipedia

   en.wikipedia.org/wiki/Valve_amplifier

   Output transformers dramatically increase the cost of a valve amplifier circuit compared to a direct-coupled transistor alternative. However, in both tube and solid state amps, matching output transformers are required for public address applications where low-loss high impedance/high voltage lines are used to connect multiple distant loudspeakers.

4. Tube sound - Wikipedia

   en.wikipedia.org/wiki/Tube_sound

   Due to the nature of vacuum tubes and audio transformers, the output impedance of an average tube amplifier is usually considerably higher than the modern audio amplifiers produced completely without vacuum tubes or audio transformers. Most tube amplifiers with their higher output impedance are less ideal voltage amplifiers than the solid state ...

5. Valve audio amplifier technical specification - Wikipedia

   en.wikipedia.org/wiki/Valve_audio_amplifier...

   The use of differential ("push–pull") output stages cancels standing bias current drawn through the output transformer by each of the output valves individually, greatly reducing the problem of core saturation and thus facilitating the construction of more powerful amplifiers at the same time as using smaller, wider bandwidth and cheaper ...

6. Impedance matching - Wikipedia

   en.wikipedia.org/wiki/Impedance_matching

   The output transformer in vacuum-tube-based amplifiers has two basic functions: Separation of the AC component (which contains the audio signals) from the DC component (supplied by the power supply) in the anode circuit of a vacuum-tube-based power stage. A loudspeaker should not be subjected to DC current. Reducing the output impedance of ...

7. Valve RF amplifier - Wikipedia

   en.wikipedia.org/wiki/Valve_RF_amplifier

   A valve RF amplifier (UK and Aus.) or tube amplifier is a device for electrically amplifying the power of an electrical radio frequency signal. Low to medium power valve amplifiers for frequencies below the microwaves were largely replaced by solid state amplifiers during the 1960s and 1970s, initially for receivers and low power stages of ...