Keywords: 6n11, 6p6p on the board
The author used domestic tubes 6N11J and 6P6P to make a simple circuit, simple electronic tube superlinear amplifier. After many adjusted schools and actual audition, the sound performance is extraordinary, pleasant and pleasant, and the circuit is seen.
First, tube
6N11J is a high-frequency dual-triode, the last century development is used in the tube TV VHF high frequency head as high frequency voltage amplifies, high application frequency, and many friends think it is a tube that is more flaws, the author passed the experiment, feel This is true when applied to the SRPP circuit. However, if you use a common total amphine, just choose the work point, the sound is round, the sound quality is small, the distortion is small, it is not possible to compare other voltage amplifiers. The author tried some voltage amplifier to experiment, and the performance was not as good as 6n11j. Moreover, the consistency of the internal double tripod tube is also accurate than other tubes.
6P6P beam small power tube, is also a famous power tube. The author uses the "Dawn" brand J-grade carbonaceous military tube produced in May 1978, which is not only the price of cheap, quality and reliability. The sound performance can be used directly with the 6V6GT of the domestic early or imported.
Second, blocking parts
The coupling capacitor uses a WEST-CAP oil, the longer the sound performance of the capacitance. Of course, it is also good to use fever oil dip compromum such as Jensen, TCC, Sibibi VQ, and domestic DG brand CZ30-2, CZH-J2 and other oil capacitance.
Cathode bypass capacitor Japanese ELNA BP audio special non-polar electrolytic capacitance, sound quality flat, 靓, positive.
High-pressure filter capacitor uses British BHC, Italy Kensham, Philips Bluxtales or domestic days and et al. Pre-quadruple decoupling should be used in parallel with CBB film capacitance and electrolytic capacitance, there is a good high high medium low frequency performance.
Resistance is used in domestic "big red robes".
Third, transformer
The quality of the output transformer determines the quality of the sound, which is appropriate to use an oxygen-free copper wire to wind. The iron core uses a west and Japan Z11 imported sheet, and the output power is 5W or 6.5W, and the experienced master can wind itself. If the optional output transformer without superlineability (SG) tap, the power tube should be subjected to a beam standard pickup instead of using a triode connection to ensure that the circuit has sufficient gain and output power, and increases the loop negative feedback, ie Minimize 65kΩ negative feedback resistance to 27kΩ to improve circuit linearity and distortion.
The power transformer uses the DB-50-300 50W six-lamp mining machine of Shanghai Radio 27th. Although the high voltage current value has exceeded the standard, because the transformer is good, the margin is large, the temperature is not very high, Acceptable.
In addition, the rectifier is used to perform a full wave rectification with a crystal diode, and then use the electron pipe 6Z4 anode and together with high pressure buffer, and the 6Z4 has a screen red overload.
Author: Fang Junkun
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