I. Overview
Miniature tube 6C6B is a small brother in the tube family, also known as ultra-small tube or "fur tubing", 8mm in diameter, 33mm high, weight 2g. Since the size is small, it is widely used in the microwave transmitter carried in the hydrogen balloon meteorological detection, and the high-altitude temperature, humidity, such as the high-altitude temperature, humidity detected, and the transfer are sent back to the ground, through the ground Radar station receives, processing the detected meteorological data data, provides a basis for weather forecasting. Small audio is made with 6C6B, the size is small, the power consumption is small, which can be used in direct power with DC, which is easy to use in the mobile station. Therefore, it is favored by ambiguous enthusiast.
Second, the application example
1 double channel single tube amplifier
Figure 1 is a single tube stereo small power amplifier, from V1, V2, amplifying, respectively, respectively, and outputting 100 mW of audio power from output transformers B1, B2, respectively, and pushes a pair of 32 Ω stereo earphone RJ. The power supply is powered by DC power supply. The armor EA is a lead-acid battery of 6V 10AH, and the wire supply ethi is 34 3.6V 2.6AH lithium battery is connected to 122V, and power is supplied to the screen. Charge can be loud for 24 hours.
2 cathode output
Figure 2 is a small power amplifier consisting of 3 6C6B, wherein V1 is actuated as a push-pull circuit composed of a cathode output, V2, and V3. The audio signal voltage is input from the V1 gate, and the audio current output from its screen is enlarged by V1. The input transformer RB primary windings, the two audio voltages should be added to the V1, V2 tube, respectively, on the secondary windings. Gate. The two voltage sizes are opposite, that is, it is inserted. After V2, V3 is pushed out, the output transformer Cb connected in the cathode circuit is output from the output transformer CB in the cathode circuit to push the speaker Y pronunciation. Y is an 8Ω 0.5W computer tantinder.
The output transformer CB is wound into a self-adjusted actuator, and the speaker draws the audio power directly from the tube loop, and the playback effect is better and the efficiency is higher. The input transformer secondary winding no longer uses the normal of the usual coil belt central tap to ground, and the two-single winding is used to pass the two-act ventilated cathode and the gate. This approach avoids the drawbacks of the output transformer to reduce the output power to the power amplifier gate to the power amplifier gate.
The gate negative bias is acquired from the cathode resistors R4, R5, respectively, and the secondary windings are respectively delivered to respective push tube gates, respectively. The audio signal is bypassed by C3, C4.
The power supply AC220V is introduced from the power switch K, the insurance BX introduces the power transformer DB primary, secondary 6.3V ignited the filament. The high pressure winding 130V AC voltage is rectified, the resistance R6, R7, the capacitance C5, C6, C7, C8, the capacitance C5, C6, C7, C8, and the triode BG1, the regulator tube W1 are electron filtering, and the voltage supply 120V voltage supply electron tube is applied after the voltage regulator.
Since the tube operating voltage (+ 120V) is low, only 1/5 of the Fu-7 tube (+ 600V), if the same quality cation is flying from the screen, the kinetic energy of the cathode surface is only FU-7 tube 1/25, the damage to the coil is negligible, and the service life of the tube has little effect. Therefore, when power is powered by the semiconductor diode rectifier circuit, do not consider increasing the high voltage delay power supply circuit.
Third, the production of transformers
1 Output transformers B1, B2 (Fig. 1) Making primary φ0.1mm enameled wire around 2240 turns, secondary φ0.16mm enamel wire by 180 turns. The iron-hearted tongue is 1.5cm, the thickness of 2.0cm, EI type silicon steel sheet, iron core is smooth, and a thickness of a thickness of 0.1mm in the gantap.
2 Enter the transformer RB (Figure 2) Production: The primary use φ0.1mm enameled wire by 2500, the secondary φ0.1mm enamel line double line and around 1250. And press the circuit according to the method shown in Fig. 2. The iron heart tongue is 1.5cm, the thickness of 2.0cm, EI type silicon steel sheet, the iron heart is smooth, and the thickness is 0.1mm cable paper at the magnetic gap.
3 Output transformer CB (Fig. 2) Making windings 1-2 with φ0.1mm enameled wire 1050, windings 2 ~ 3 with φ0.25mm enameled wire by 90 turns, windings 3 ~ 4 φ0.25mm enamel wiring around 90, winding 4 ~ 5 With φ0.1mm enamel wire 10500. The receiving circuit shown in Figure 3. The iron heart is 1.5, the thickness of 2.5cm, EI type silicon steel sheet, core interpolation.
4 The production of power transformers DB. The primary winding with φ0.13mm enameled wire by 2640 turns, the secondary high pressure winding line with φ0.13mm enamel wiring around 1560 turns, the filament windings with φ0.69mm enamel wiring around 80. The iron heart is 2.0 mouth, stack 2.4 cm, EI type silicon steel sheet.
Fourth, tube 6C6B characteristics
1 General application value: bypass heat cathode triode. Uses: low frequency voltage amplifier and high frequency oscillation, filament voltage fu = 6.3V. Filament current IF = 0.2a, anode voltage uA = 120V, anode current IA = 9 mA ± 2 mA, cathode Resistance rk = 220Ω amplification coefficient u = 25, cross-conversion S = 4mA ~ 6.3mA / V
2 limit application value: maximum filament voltage ufmax = 6.9V minimum filament voltage umin = 5.7V, the highest anode voltage umax = 250V, the maximum filament and the cathode pressure ufk = 150V, gate resistance
Rg = 1MΩ, the highest operating frequency fmax = 500MHz.
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