A amplifier more and more attention. One reason for the CPI amplifier crossover distortion does not exist , does not produce unpleasant odd harmonics , which is the key to the pure sound quality . The second is A amplifier has been working in the best condition , will not have that kind of switch B amplified distortion. It is characterized by a negative feedback loop to cancel a large order to avoid transient intermodulation distortion , the dynamic index increased substantially.

The machine design specifically for the study , no fair without , but only to its excellent sound. A single-tube by tube amplifier, both out of consideration of quality , but also take into account the amateur production of push-pull tube amplifier matching problem difficult to solve . Although less efficient tube Pure Class A amplifier , but its power reserves , compared with the transistor amplifier can be as small as half. Research data show that there is pure A and B power For the same quality (referring to Pure Class A amplifier power does not exceed the rated value ), the latter shall have the power 9 times the reserves of the former . So, Pure Class A amplifier is the absolute efficiency may be worse, but the relative efficiency is almost the same.

Gentle tube sound with one of the Confucian style, is the so-called moderation , coupled with its own unique classic tube tone and nostalgic , warm enough to study tremendous atmosphere. If the gall bladder , such as those Ming KT88, KT100, 845 , etc. , can be called ru , then the machine may be called small Confucianism , if you enter your study in such a small Confucianism, is equivalent to procure the one of your bosom friend , Depression when he softly paragraph language to comfort you, happy to add to the fun when he was laughing , why not ?

This machine has the following characteristics:

Undistorted Output power 2 ~ 5W;

Circuit is simple, no special components and some components are given maintenance experience;

The machine wide frequency response , low distortion , high and low tone control circuit with the circuit , easy to use.

Circuit Work
Whole circuit. Just Only 2 children per channel . Amplification of the Tone before and after the network is divided into two parts for the industry . The first part of the voltage amplification part of the latter part of the last class before the class and power amplifier . VE1, VE2 selection of high µ pipe 6N2, to improve the machine sensitivity. Voltage amplifier stage of the major technical indicators amplification and frequency distortion . 6N2 amplification factor of 97.5 , enough to meet the local requirements. Using resistance-capacitance coupling , intermediate frequency amplification region the largest amplitude frequency and phase frequency characteristics are very flat. While the low frequency region and high frequencies in the law are to a certain decline. Usually necessary to raise the upper limit of the frequency decreases the value of R4 , to extend lower frequency would have increased the value of C1 . After repeated testing , the unit anode voltage amplifier stage load resistor value 150k, C1
with 0.1µF. Before the end of class is typical of the self with the cathode bias resistor and the negative feedback voltage amplifier leapfrog .