Tube Amplifier Archives - Amplifier Circuit Design

100 W valve audio amplifier

Amplifier Circuit — Sat, 16 Jun 2012 23:30:04 +0000

This is a valve 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 :).

Valve 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

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2x4W Stereo Tube Amplifier Circuit

Amplifier Circuit — Mon, 29 Aug 2011 06:34:33 +0000

Stereo audio tube amplifier circuit diagram. Do not forget hook-up wire, sockets, switch, and also a chassis or circuit board. All tubes are octal type and will require an octal socket. Shield any hook-up wires utilized within the signal path between the input jack and the first audio tube.

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Here the schematic diagram of 2x4W stereo tube amplifier which built based 5 power tubes component. This amplifier will produces up to 4 watt audio power for each output channel.

Components list:
C1, C4 = 200pF/600v
C2, C5 = 47nF/600v
C3, C6 = 22uF/25v
C7 = 47uF/450V
C8 = 33nF/450V
C9 = 10nF/1400v

R1A & B = 500KΩ Dual gang Potentiometer
R2, R6 = 1MΩ 1/2W
R3, R7 = 470KΩ 1/2W
R4, R8 = 220KΩ 1/2W
R5, R9 = 330Ω, wire-wound or metal oxide 2W
R10 = 750Ω, wire-wound 20W

Audio Output Transformer T2, T3
Primary (impedance) = 3300 Ω @ 400 cycles
Secondary (impedance) = 4 or 8 Ω @ 400 cycles

Power Transformer, T1
Primary = 117v 60 cycles
Sec. 1 = 600v CT @ 80mA
Sec. 2 = 5v @ 2A
Sec. 3 = 6.3v @ 4A

Tubes:
6SQ7-GT
6V6-GT
5Y3-GT – Full-wave vacuum rectifier

Circuit notes:

For finest audio reproduction results, 90db/watt speakers or higher efficiency should be utilized.
Do not forget hook-up wire, sockets, switch, and also a chassis or circuit board. All tubes are octal type and will require an octal socket.
Shield any hook-up wires utilized within the signal path between the input jack and the first audio tube.
R10 will create considerable heat, and care needs to be taken in its location. I utilized a large adjustable wire wound resistor for this and mounted it above the chassis. A choke coil in its place would give better performance and more closely resemble the electromagnet field inside the prototype.
A choke coil with a DC resistance approximate to 750 ohms may possibly be substituted for R10.

This 2x4W stereo tube amplifier circuit is taken from wkinsler.com

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Simple High Quality Tube Amplifier Class A

Amplifier Circuit — Mon, 01 Aug 2011 15:58:59 +0000

Tube Amplifier Class A schematic. Installation notes : 1. Do not use as “ground” bus chassis amplifier. 2. Separate power and signal “ground”. 3. Have transformers away from each other. 4. Windings of transformers should be perpendicular to each other. 5. Wires as short as possible.

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Amplifier built on a wide spread basis element, and the values of elements may differ from those listed at 10-20 percent, without degrading the amplifier characteristics.

U1 – 6N1P (one half – the right channel, the other – left); U2 – 6P3S.
resistors, used in the amplifier type MLT-0.5, R5 – MLT-2.
Capacitors C1, C3, preferably paper – to voltage is less than 300 V.

Installation notes :
1. Do not use as “ground” bus chassis amplifier.
2. Separate power and signal “ground”.
3. Have transformers away from each other.
4. Windings of transformers should be perpendicular to each other.
5. Wires as short as possible.

Power supply circuit can be found here.

WARNING!
The amplifier anode tubes are high voltage, be careful!

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