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Keith Snook's. — Valve Amplifier and other Schematics
http://www.keith-snook.info/schematics.html
Beard Audio P35 valve power amp circuit modified to remove the problem d.c. input coupling and the active bias circuit ~ parallel valve amplifiers need good output transformers which the original does not have ~ and separate resistor biasing helps prevent them melting down with inevitable valve mismatch. Beard Audio P35–M70.
Practical Amplifier Diagrams - tubebooks.org
http://www.tubebooks.org/Books/Atwood/Robin%20&%20Lipman%201947%20Practical%20Amplifier%20Diagrams.pdf
Audio amplifier schematics Keywords: Audio amplifier schematics Created Date: 1/6/2007 11:45:09 AM ...
Valve Amps: Valve amp basics - Lenard Audio
https://education.lenardaudio.com/en/14_valve_amps_2.html
Valves for audio amplifiers are categorised into three primary groups. A Small (noval base) pre-amp twin triode 12AX7 and 12AU7. 12AT7 12AY7 similar but less used. B Small (noval base) power tubes for 10 to 15 Watt amps. C Large (octal base) power tubes for 30 to 100 Watt amps. EL34 6CA7 6550 KT88 KT90
DIY Vacuum Tube (Valve) Amplifier Projects - Hi-Fi Audio
https://diyaudioprojects.com/Tubes/tubes.htm
The schematic is similar to the PoddWatt design and able to use a huge variety of tubes. The JBAA tube amplifier can use a 12AX7, 12AU7, ECC82, ECC83, 5751, 12SL7 or 6SL7 in the driver position while 6V6, 6AQ5, 6005, 6Y6G, EL84, 6BQ5, 6F5P, 6P15P-EB, 6Y6GA, 6K6, 6W6, 6GV8, 6BM8, ECL82 or ECL85 can be used for the output tubes.
Simple Valve Amplifier Circuits. - Cool386
https://www.cool386.com/amps/amps.html
The rest of the receiver is standard with 6AN7, 6N8 and 6X4 valves. 6BL8 Amplifier. Used in one of my Pulse Counting FM Receivers, this design puts out about 300mW. It requires about 14mA at 215V for the B+ and 450mA at 6.3V for the heater. The 6BL8 is undoubtedly the most widely used TV valve in Australia.
Audiovalve – tube amps since 1982
https://www.audiovalve.info/
It is a dual-mono design, and delivers up to 12 watts per channel of OTL Class A tube power, has multiple inputs (balanced, singe-ended, and even a MM phono preamp built in) has front-panel gain control and a balance control. It also has pre-outs in case you'd like to use it as a preamp for external amplification.
DIY and Hi-Fi Audio Schematics - DIY AUDIO PROJECTS
https://diyaudioprojects.com/Schematics/
DIY and Hi-Fi Audio Schematics. This is our collection of DIY and Hi-Fi Audio Schematics. Feel free to send us your hi-fi audio schematics and we will add them here. If you have built any of these circuits, we would love to hear from you so send us your comments. Many of these diy Audio Books contain schematics.
Valve Amps: Power-supply - Lenard Audio
https://education.lenardaudio.com/en/14_valve_amps_6.html
Many valve amp manufacturers particularly guitar amps, fail to understand the importance of a secure -Bias Voltage. Often the Bias circuit is supplied from, a single diode 1/2 wave rectifier, a high source Impedance, therefore a large time constant, on turn on.
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