SRPP + 6V6GT single-ended Class A amplifier production 6V6GT Class A amplifier
Author: Fang Jing
6V6GT tube has the reputation of "alpine water" in the chariferation world. It has the extraordinary sound quality, and the price is reasonable. The only disadvantage is that the output power is slightly smaller, and the high-fidelity speaker with high sensitivity can be used to play an excellent sound performance. Many enthusiasts have been appreciated by the circuit introduced in this paper, and many enthusiasts have been appreciated by their sound quality, called their sound effects similar to the fame and 300B.
The front placed in front of this unit adopts everyone's familiar SRPP line (commonly known as riding circuit), circuit is a double tripode series, and the exchange is parallel, and it has many advantages, such as distortion. Small, high and low frequency extension, speed fast dynamic and low output impedance. Some people say that the circuit is too sound, but it can be used to make up for the appropriate voltage amplifier and components. It can better push the post-level power amplifier with the first level. Due to the high midpoint voltage (half of the screen pressure), in order to prevent the filament, a cathode breakdown, the filament is a method of high DC potential.
The SRPP amplifier adopts large eight foot tubes 6N8P or 6N9P. 6N8P and 6N9P are electronic tubes different from the two sound styles, and the parameters are not the same, but they have their own characteristics. Since the SR corpse circuit is strong, this machine can directly interchange the tube test to suit your own hearing. Under normal circumstances, the 6N9 sound is bright and clear, the speed is fast, but the charm is slightly; the 6N8 sound performance is round, the music is good, and the gallbladder is thick.
The choice of coated capacitor: US WEST CAP (West Electric) oil immersion capacitor and Sprague A VQ (Schi) arthropogenic capacitor, like 6N9P and 6N8P tube, is also a different style. A bright, slightly bad, a round, good, all the commonly used tonic capacitors. Now introduce a better oil immersion capacitor, that is, Denmark's Jensen (God of Well) Silver Film Increase Capacitor. It is very sound, and it is considered to be one of the most sounded capacitors in the world. When listening, this is like a fairy. Although the cost of the capacitor is very expensive, it is not enough to be in a lifelong, and the burning is not! But when purchasing, you must divide the silver film or aluminum film, silver film capacitor appearance is white porcelain pipe package and silver (there are also It may be a copper film) package, while the golden yellow package is more aluminum tube aluminum film. The two sounds are very different. The price is also very disadvantage, and it needs to pay attention to the purchase, careful identification.
The cathode bypass capacitor, the 6N8P pre-stage tube was used to add 2.2 μF of the EC80μF film capacitance to REO. US EC capacitors are round and listening, low frequency is level; while Germany's REO green MK is high and fast, the speed is fast, the two matches, and complement. 6V6GT cathode capacitor with an 80μF EC capacitor and then in parallel with a Japanese Elnas gold-character audio-specific electrolytic capacitance, and the audio is better than other capacitance. The power circuit filtering uses a large-capacity high-pressure polypropylene capacitor and oil immersion capacitance, without having a large capacity electrolytic capacitor, which allows the sound to be more clear and smooth, and the medium and high frequency band is round, and the sound is beautiful.
Domestic power pipe 6V6GT, with the best in early electrician card, Nanjing is also very good, followed by Dawn 6P6P. In order to take care of the sound quality and output power, this amplifier uses a superlinear connection. The circuit also applies a small amount of large loop negative feedback to improve the frequency response and reduce distortion.
The power of the power transformer uses more than 100W, and the specific voltage data circuit diagram has been shown. Output transformers are used to select a brand, and the quality is also uneven, and the reputation and reputable products should be used. A powerful person can also be self-contained. The power is SW or 65W. The maximum output power of this unit is about z × 4w.
In addition, it is preferred to select a speaker to use the HI-1 Fi-flavoring speaker consisting of a paper diaphragm (or paper coating film) speaker unit having a smaller sensitivity than 91 dB power, so that the extraordinary sound quality can be exerted. And relatively high efficiency.
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