A complete set can be provided, which is 100 yuan less than the price of the whole machine. Need to take a picture to find customer service to change the price.
The company produces testing equipment
At the end of the 1960s, British engineer John Linsley Hood sprouted the idea of ??achieving the performance and sound quality of Williamson amplifiers with simple transistor circuits. In 1969, he introduced the JLH single-ended Class A OTL amplifier in Radio World. Ten years later, the JLH single-ended headphone amplifier based on the OTL amplifier was also announced to the world, triggering a new wave of production and research. Because its circuit form is similar to OTL, the circuit is very unique and unforgettable at first glance, so some people call it J. HOOD OTL power amplifier, some friends gave it a Chinese name for the HOOD OTL power amplifier.
HOOD1969 has a very simple circuit, low distortion, phase distortion, wide sound field, good details, warm and moist sound, audio enthusiasts have not stopped imitating it for decades. Also because the circuit heat is relatively large, the aluminum heat dissipation cost of the chassis is high, but few manufacturers apply it to mass products.
In addition to the normal listening equipment, many old-fashioned homes will generally have a large pure Class A power amplifier of tens of watts placed next to it. When listening to some music, they will change it to find a better feeling.
However, the 10W output power of the original circuit in 1969 is still slightly smaller. If it can achieve more than 20W, it will not only have a wide sound field, good mid-frequency, but also better sound field and low-frequency performance, but also can meet the needs of large occasions.
First on the schematic diagram
technical parameter:
Output power: 24WX2(Pure Class A, RMS, 8Ω, per channel, equivalent to 120W of thrust of Class A and B)
Harmonic distortion: ≤0.03% (1kHz, 1W)
Signal to noise ratio: ≥ 102dB(A-weighted, extremely quiet late at night)
Frequency response: 20Hz-35kHz(±0.5dB)
Input impedance: 50kΩ
Output impedance: 4~8Ω
Color: black case + silver aluminum alloy panel
Dimensions (L×W×H): 360×316×150mm(Excluding machine feet and handles)
Net weight: 13kg(Courier fee is charged at 15 kg with packaging)
Material characteristics of the whole machine:
First of all, this machine is not a copy of a famous circuit. Whether you call it 1969 or not 1969, it doesn''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''t matter that it can bring you a truly amazing listening experience.
The all-aluminum alloy specially customized Class A power amplifier box with coarse ore straight lines indicates that this machine has a strong foundation and explosive power, and the delicate workmanship meets the precise sound field details of the pure Class A power amplifier circuit.
The left and right channels are mirrored and symmetrical to maintain good separation, and the small signal amplification part is far away from the power supply and transformer. At this time, you have to say that your power switch has 220V AC in the front and will interfere in the past. I''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''m sorry I used the soft start circuit, which is installed under the ring cow. The front panel switch has only 12V DC voltage, which will not cause interference.
The power supply of this machine uses a second-hand disassembled TALEMA sealed 333W single 37V9A transformer(Mind the second-hand ones, please go around, or buy them when I run out of custom-made domestic ring cows)This kind of transformer has been sold on Taobao for 10 years, but it has not been sold. It just so happened that my circuit was able to be used, and it was all received. In fact, the number is not large, but it is actually of very high quality. The current whole machine can guarantee that you can''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''t hear the bottom noise in the dead of night. It has a big relationship with this cow, and the other is the timbre. Let''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''s go for this personal feeling.
3 ELNA63V10000UF filter electrolysis per channel. Input field pipe 2SJ104 (2SK364)(brand new), Push tube K213(J76)(Disassemble), Output tube 2SK1058 (2SJ162)(brand new).Please pay attention to the model of the tube in parentheses, if the machine received is all the model in parentheses(P-channel tube)Please don''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''t be surprised, nor as a reason for return. Because these field tubes are more expensive and are sold in pairs, and tubes of the same pole are easier to pair. So please don''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''t pick it when you buy it. Determine which tube you want. We can only ship it randomly. If you must require an N-channel tube, please add 50 yuan!
The output capacitor uses 2 3300UF ERO gold bullets in parallel for each channel,(The supply of this item is also unstable. If the actual item received is different from our picture, we will replace it with a capacitor of the same level, not as a reason for return)
Physical installation diagram of the whole machine