FEATURE
1. 5670/2C51/6N3 tubes are used for two channels buffers with cathode follower configuration.
2. Provide unity gain and double output power. The tube preamp come with low output resistance and provide high driving capability.
3. For the DVD/HDCD/CD analog output, it produces sweet and deep audio sound after go through the 5670 /6N3 or equivalent tube buffer preamps.
4. Simple design, high linearity, low distortion.
5. Dale resistor, WIMA and Muse capacitor, and Vishay 1N5062 diode
6. Independently supplies for heater filament to reduce noise coupling.
7. Built-in voltage regulating circuitry
8. Small dimension: 160mmx90mm, 2.5mm thickness and 2oz copper
2. Provide unity gain and double output power. The tube preamp come with low output resistance and provide high driving capability.
3. For the DVD/HDCD/CD analog output, it produces sweet and deep audio sound after go through the 5670 /6N3 or equivalent tube buffer preamps.
4. Simple design, high linearity, low distortion.
5. Dale resistor, WIMA and Muse capacitor, and Vishay 1N5062 diode
6. Independently supplies for heater filament to reduce noise coupling.
7. Built-in voltage regulating circuitry
8. Small dimension: 160mmx90mm, 2.5mm thickness and 2oz copper
Optional: Toroid Transformer T20 50W
Output Power: 50W
Insulating strength: 10Mohm, AC2000V/1min
Input Voltage (AC): 110-115V /220-230V
Output Voltage (AC): 9-0-9V/1A
15-0-15V/1A
Insulating strength: 10Mohm, AC2000V/1min
Input Voltage (AC): 110-115V /220-230V
Output Voltage (AC): 9-0-9V/1A
15-0-15V/1A
ASSEMBLY GUIDE
1. Solder all the components according to the schematic and part list. To obtain a unity gain, use R2= 1Kohm and R5=1Kohm instead of short; the short of R2 and R5 is for -6dB attenuation (half voltage gain).
2. Connect the power transformer 15V-0-15V and 9V-0-9V and ensure the connections are correct.
3. Turn on the power supply without put in the tube. Shut down the power supply if the transformer becomes very hot or come out some strange sound; check again the connection of the transformer.
4. If everything is ok, the measured voltage of VCC (R2 or R5's end) is about 65V DC.
5. It takes several ten seconds to turn on the circuit (indication by the LED lighting) due to the power delay protection circuit.
6. Enjoy it!
TEST RESULTS
Yellow trace is input signal which includes sinewave, ramping signal and square.
Blue trace is output signal. The linearity of the waveform shows in sinewave and ramping signal that it can perserve the original input signal without introducing any distortions, whereas the sharp edge in square wave input reflect its high dynamic.
10K sinewave input:
100Hz sinewave input:
10kHz Square wave:
1kHz ramping signal:
May I ask about how to adjust VR trimmer and measure the correct value for the circuit?
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