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This is a tube audio amplifier circuit which can provide power up to 100W, here there are only schematics and component list for the explanation you can find on the internet. 100W Tube Power Amplifier circuit diagram Tube audio amplifier parts list : R1 10 kΩ C1 0.22 µF Q1 7199 P R2 100 kΩ C2 0.2 µF Q2 6L6GC R3 220 kΩ C3 0.5 µF Q3 6L6GC R4 820 kΩ C4 0.5 µF Q4 7199T R5 15 kΩ C5 0.2 µF Q5 6SN7 R6 47 kΩ Q6 6SN7 R7 100 kΩ R8 3.9 kΩ R9 8 Ω R10 820 Ω R11 22 Ω R12 390 Ω R13 15 kΩ R14 1 MΩ R15 1 kΩ R16 3.8 kΩ R17 1 kΩ R18 3.8 kΩ R19 1 MΩ R20 75 kΩ R21 47 kΩ R22 100 kΩ R23 3.9 kΩ R24 75 kΩ R25 10 Ω Read more at http://amplifiercircuit.net/100-w-valve-audio-amplifier.html

This amplifier is based on the PA100 parallel amplifier detailed in National Semiconductor's application note - AN1192. Since my DIY speaker is 4-ohm and somewhat difficult to drive, I want to have a more powerful amplifier to match with it. Therefore I designed this amplifier which uses two LM3886 per channel, in parallel circuit. This amp can deliver about 50W into a 8-ohm speaker and 100W into a 4-ohm speaker. This is a stereo amplifier and therefore 4 LM3886s are used. The LM3886 circuit is in a non-inverted configuration, so the input impedance is determined by the input resistor R1, i.e. 47k. The 680 ohm and 470pF resistor capacitor filter network is used to filter out the high frequency noise at the RCA input. The 220pF C4 and C8 capacitors are used to shot out the high frequency noise at the LM3886 input pins. I used high quality audio grade capacitors at several locations: 1uF Auricap at the input for DC blocking, 100uF Blackgate for C2 and C6, and 1000uF Blackgate at the ...

Audio Amplifier 100W or 130W ComponentRef./ValueTypeR1 120K 1/4W Resistor R2 3K3 1/2W Resistor R3 5K6 1/4W Resistor R4 3K3 1/4W Resistor R5 680R 1/4W Resistor R6 120R 1/4W Resistor R7 3K3 1/4W Resistor R8 1K2 1/4W Resistor R9 2K7 1/4W Resistor R10 1K5 1/4W Resistor R11 680R 1/4W Resistor R12 120R 1/4W Resistor R13 120R 1/4W Resistor R14 0,33R 5W Resistor R15 0,33r 5W Resistor R16 10R 1W Resistor R17 10R 1W Resistor C1 10uF 16V Electrolytic Capacitor C2 330µF 16V Electrolytic Capacitor C3 470uF 35V Electrolytic Capacitor C4 150pF Ceramic Capacitor C5 100nF 100V Polyester Capacitor RV1 1K Trimpot D1 9V1 - 500mW Zener T1 BC557 PNP transistor T2 BC557 PNP transistor T3 BC548 NPN transistor T4 BD137 NPN transistor T5 BD137 NPN transistor T6 BD138 PNP transistor T7 2N3773 NPN transistor T8 2N3773 NPN transistor L1 coil largest number of turns rolled in R16 with AWG22