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2. Valve audio amplifier - Wikipedia

   en.wikipedia.org/wiki/Valve_audio_amplifier

   Schematic Heaven – Free schematic archive of vintage guitar amplifier and effect schematics. The Audio Circuit – An almost complete list of manufacturers, DIY kits, materials and parts and 'how they work' sections on valve amplifiers. Theory paper on OTL designs – p 2007 archive

3. Gainclone - Wikipedia

   en.wikipedia.org/wiki/Gainclone

   Gainclone or chipamp is a type of audio amplifier made by do-it-yourselfers, or individuals interested in DIY audio. It is a design based on high-power integrated circuits, particularly the National Semiconductor Overture series. The Gainclone is probably the most commonly built and well-known amplifier project amongst hobbyists.

4. Valve amplifier - Wikipedia

   en.wikipedia.org/wiki/Valve_amplifier

   A valve amplifier or tube amplifier is a type of electronic amplifier that uses vacuum tubes to increase the amplitude or power of a signal. Low to medium power valve amplifiers for frequencies below the microwaves were largely replaced by solid state amplifiers in the 1960s and 1970s.

5. Dynaco - Wikipedia

   en.wikipedia.org/wiki/Dynaco

   Dynaco was an American hi-fi audio system manufacturer popular in the 1960s and 1970s for its wide range of affordable, yet high quality audio components. [1] Founded by David Hafler and Ed Laurent in Philadelphia, Pennsylvania in 1955, it's best known product was the ST-70 tube stereo amplifier.

6. DIY audio - Wikipedia

   en.wikipedia.org/wiki/DIY_audio

   An example of DIY audio: a functioning battery-operated DAC (Digital-to-analog converter) before installation in a box case. DIY Audio, do it yourself audio.Rather than buying a piece of possibly expensive audio equipment, such as a high-end audio amplifier or speaker, the person practicing DIY Audio will make it themselves.

7. Tuned radio frequency receiver - Wikipedia

   en.wikipedia.org/wiki/Tuned_radio_frequency_receiver

   The schematic diagram shows a typical TRF receiver. This particular example uses six triodes. It has two radio frequency amplifier stages, one grid-leak detector/amplifier and three class ‘A’ audio amplifier stages. There are 3 tuned circuits T1-C1, T2-C2, and T3-C3.