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Position:IcFull.com » IC Electronic information » Category: 6

IC Electronic information

6P6P ultra-linear single-ended Class A amplifier

In Electronic Infomation Category: 6 | on April 20,2011

I made good use of

tube 6N11J and P80C52 datasheet and 6P6P, made a simple circuit, super-simple linear amplifier tube, after numerous adjustments and P80C52 price and the actual audition, sound attractive. The production of circuit shown in Figure 1 (a channel).


Figure 1, an ultra-linear amplifier circuit diagram (one channel)

1 tube

6N11J is a high-frequency dual triode tube amplification, tubes used in the 20th century was developed VHF TV tuner, as a high voltage amplifier to use, showing its high frequency applications. For audio amplification, many of my friends think that is a musical pipe lighter, I experiment, the original application SRPP circuit, it is. However, if the use of common amplification were negative, as long as a reasonable choice of a good working point, the sound of the mellow sweet flavor of good, sound quality of the good, the small distortion of the noise voltage amplification of the other can not be compared. Operating point of the tube by the author, try some of the voltage amplification experiment, the performance not as good as 6N11J good.

Dual transistor and P80C52 suppliers and that the internal consistency of management, but also accurate than the other tube.

6P6P low-power radio beam tube, is a most famous low-power tubes, the tube amp world, and the names of their sound was similar to pipe 300B, it is a small 300B reputation. I use the May 1978 production of "Twilight" brand D carbon injection military control, not only cheap, its quality and use of reliability of the doubt. Early use of domestic or imported, are available early 6V6GT direct alternative, sound better performance.

2 RC parts

Selection WEST-CAP coupling capacitor oil capacitor, the capacitor burn in the sound performance of the longer the better. Of course also be used, such as Jensen, TCC, Sibi and other fever VQ oil capacitors, made of DG card CZ30-2, CZM-J2 and other oil capacitor performance is also impressive.

Cathode bypass capacitors ELNA BP with Japanese audio-specific polar electrolytic capacitors, sound level, good, positive. High-voltage filter capacitor

the British BHC, Italy is willing to get gold, Philips blue hexagonal or other fever-made days and electrolytic capacitors can be. CBB-level decoupling is preferable to the former film capacitors and electrolytic capacitors in parallel, a better high, medium and low-frequency performance. Domestic red

Resistors Resistance (commonly known as "Big Red") can be.

3 Transformers

Determines the quality of the output transformer sound quality, oxygen-free copper wire wound should be selected, the core power with the West or Japan Z imported films, the output power of 5 W or 6.5 W of the product; can also be used through the test, the frequency ring curve better cheap products; an experienced master self-winding course. If no matching ultra linear output transformers (SG) taps, the power tube beam radiation should be used instead of the standard connection connection transistor is preferred to ensure that the circuit has sufficient gain and output power, and deepen the large amount of negative feedback loop , that is, to reduce the negative feedback resistor 65 k 27 k, to improve the circuit linearity and distortion.

Power transformer plant in Shanghai seven radio * DB-50-300s six light machine 50 W disassemble products, although the use of high-voltage current value has exceeded the time, but because of the transformer of good quality and large margin, the temperature rise is not high, within an acceptable range.

In addition, the crystal diode rectifier full-wave rectifier, then parallel for high-voltage anode tube * buffer, using for several months * have not found the red screen overload.

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