Vacuum-Tube | Electronic Project Circuits

Posts Tagged ‘Vacuum-Tube’

2×45 Watt Tube Amplifier

The circuit is simple, yet is capable of excellent performance. I designed it specifically for use as an amplifier for the digital sound card in my computer. Audio input can be from any two-channel line level device such as a television, CD player, or VCR. It is of the tube type, using only 5 tubes total with no more than about 45 Watts power consumption from the outlet. It uses 3 types of tube 1 5Y3 GT vacuum rectifier, 2 6SF5 GT high-mu triodes, and 2 6K6 power beam amplifiers.

Part

R1, R10, R13 6 2.2Meg Pot
R2 2 470K 1/2W Resistor
R3 2 1 Meg 1/2W Resistor
R4 2 220K 1/2W Resistor
R5 2 330 Ohm 2W Resistor
R6 2 220K 1/2W Resistor
R7 2 2.2Meg 1/2W Resistor
R8 2 1Meg 1/2W Resistor
R9 1 720 Ohm 20W Resistor
R11 2 33K 1/2W Resistor
R12 2 22K 1/2W Resistor
C1, C9 4 0.005uF 400V Capacitor
C2 2 0.05uF 600V Capacitor
C3 2 20uF 25V Electrolytic Capacitor
C4 2 0.01uF 400V Capacitor
C5 2 200uuF 400V Ceramic Disc Capacitor
C6, C7 2 15uF 450V Capacitor
C8 2 15uF 400V Capacitor
T1 1 117V Primary, 350VCT Secondary, 6.3V Secondary, 6.3V Secondary
T2 2 7600 Ohm Primary, 4 or 8 Ohm Secondary
SW1 1 SPST Switch
SP1, SP2 2 12″ or smaller, 4 or 8 ohm speakers
MISC 1 5 tube sockets, 2 RCA jacks, PC board or chassis, wire, knobs, etc.

Read More Source:http://www.aaroncake.net/circuits/tubeamp.asp
Thank you.

Be the first to comment - What do you think? Posted by admin - February 19, 2008 at 9:36 am

Categories: Power Amplifier Tags: Stereo amplifiers, Vacuum-Tube

Push-Pull Class A 2A3 Stereo vacuum tube Amp

The input stage is comprised of a both halves of a 6SL7 octal dual hi-mu triode in a differential amp configuration with a 1ma constant current cathode load. I’m using field-effect (constant-current) diodes for simplicity. the diff amp approach was chosen for good power supply rejection, ease of balancing, good gain, and ease of application of *feedback*, if desired (hey, i like to keep an open mind…). It also takes care of phase-splitting right up front.

Read More Source: http://www.geocities.com/TimesSquare/1965/project.html Thank you.

Be the first to comment - What do you think? Posted by admin - at 9:29 am

Categories: Power Amplifier Tags: Power Amplifier, Vacuum-Tube

THE MAIN TUBE AMPLIFIER 4W

This is the schematic diagram of the “Li’l 4×4′s” main amplifier circuitry. This completes the circuit if you’re only interested in line-level input sensitivity.
The first big difference in this design is that the output stage is fixed-biased rather than cathode-biased. This gives excellent control over the bias point, and also does not “rob” any range from the tubes’ allowable voltage swing. It also allows us to operate the tubes in Class AB1 mode without any bias shifts as either tube is driven close to cut-off.

The use of Class AB1 mode essentially doubles our output power, compared to the KT-92 design; where the KT-92 barely achieves 2 watts before exhibiting noticeable flattening of the input waveform, the “Li’l 4×4″ puts out a solid four watts before clipping (using 30A5/HL94′s). What’s more, the total power dissipation of the tubes is actually reduced! The KT-92 runs at about 65 milliamperes, with a plate-to-cathode voltage of about 87 volts, for a dissipation of 5.7 watts. The Li’l 4×4 runs a plate-to-cathode voltage of around 180 volts, at 20 milliamperes quiescent, for a dissipation of 3.6 watts. At full output power plate dissipation increases to about 5.4 watts.

Read More Source: http://www.dogstar.dantimax.dk/tubestuf/4x4howit.htm Thank you.