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Type A = high configuration vacuum tube: US GE-12au7 + 7025/12ax7
Type B = Upgrade antique vacuum tube: US RCA-12au7 + RCA-12ax7
Note: For 110V. Need to be customized.
Carefully selected devices:
The vacuum tube preamplifier has two main components: the power supply and the vacuum tube.
R-type transformer is known for its low magnetic leakage, high efficiency, low internal resistance and over-carrier motion, and its explosive power is better than toroidal transformers; its good isolation effect, the use of high-precision winding machine R-type transformer in the instrument or audio It has outstanding performance in the equipment, which can improve the signal-to-noise ratio in the equipment, isolate the multi-harmonic interference caused by the power grid, reduce the sound loss of the audio, and increase the dynamics, so that the amplifiers that are not good at dynamics and details can also Outstanding performance out of the ordinary.
The vacuum tube is the key point. A good machine must of course be equipped with a good tube. The carefully selected bile duct accounts for the price of the whole machine.
A small part of the grid, since the ingenuity works if you use ordinary electron tubes, it will be violent.
Two 6Z4 bile ducts are used for rectification, with audio tubes-a pair of 12AX7 tubes and a pair of 12AU7 tubes,
We have carefully selected two tubes and two electronic tube configuration machines from many bile ducts. You
Can be selected according to the matching and requirements:
1. American GE12au7 triple mica tube, made in the 1950s, soft sound, good dynamics, solid low frequency; 7025 bipolar screen flow tube, low distortion, mellow taste, soft and clear sound quality.
2. The upgraded version of the bile duct adopts the American RCA12AU7 triple mica black screen steel reinforced version, low frequency in place, good dynamics, soft sound, full mid frequency, beautiful high frequency, a very rare tube; RCA12AX7 tube, sweet and delicate sound, good flavor. The sound of this RCA bile duct combination produced in the 1960s is very poisonous, and the sound quality is excellent. It is not inferior to the two pairs of German Degen electronic tubes of the same model (prices of more than 2,000 yuan).
The upgraded version of the vacuum tube (two RCA12AU7 three mica tubes/two RCA12AX7 tubes) is for
Convenient to use high-end equipment and friends who like better bile ducts. Both versions are equipped with bile ducts only
The pipes are different, everything else is the same.
(Reminder: 12AU7 tube has two tube codes: 5814 and 6189)