DIY tube tester, Vacuum Tube Tester
Keywords: DIY tube tube tester
DIY tube tester
Due to the like, many pipes have been stored for many years. One wants to buy an electronic tube tester, and I have tried several times to find out that most testers have been seriously aging due to the long history. And the negative gate pressure of the domestic tube tube is provided by the resistance of the change of the cathode resistance (it is the self-contained negative gate pressure we often say), the aging of the resistance and the poor contact of the connector will affect the accuracy of the test. An accidental opportunity to see the foreigner DIY tube tube tube tube tube tester is very small and practical, it is planning to do itself. But do some modifications according to your own ideas. Design Ideas and Implementation: Mainly for most tubes, you will not take care of yourself. Use a ready-made Japanese instrument cattle to do the main power supply. Parameters: 0V-6.3V-12.6V / 2A, 0V-310V / 100mA, 0V - 19V / 1.25A
1. See Figure 1 of the schematic, do not want to draw, borrow the original picture of foreign netizens. The specific changes are as follows:
(1) Signal of Switch selective string AC1V on the gate negative pressure.
(2) Change the existing header into several appearance heads and increase the AC20mA digital display head test transconductance, and separate the voltmeter shared on the original picture and the gate negative pressure. (See schematic)
2. Install a small 7 feet of 9 feet on the panel. The foot 1-1 2-2 of the tube holder. . . . . . After one, connect to the 1-9 socket on the panel. The positive pressure negative gate pressure is connected to the socket on the panel and tagged. Use a jumper when testing. (See Figure 2)
figure 2
2. Power-screen test Use a DC200MA digital current head string to the screen high pressure loop, adjust the screen pressure and negative gate pressure, turn the test switch, turn the screen high voltage loop, you can read the screen. 3. Foreign testers can only test the screen without testing cross-guides, intend to add a cross-guided test. Make an AC1V small transformer, when you need to test the cross guide, the AC1V string to the gate is negative, and the switch to switch the screen high pressure loop to the digital meter of the AC20ma to read the cross guide. 4. The filament voltage is directly used due to the limitations of cattle. 5. The pocar pressure is 300V adjustable, and it is carried out in real time with a digital voltmeter. 6. Negative gate pressure is adjustable to -1.25-30V, and use a digital voltmeter to monitor.
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The 9 yellow sockets in the figure are the left and three red sockets corresponding to the foot of the tube, and the three black sockets of the G2 is K K "and the G3 intermediate tube. There are 3 yellow sockets. -Ug -ug "and G1 For domestic tipes such as 6n1 6n11, such as 6n1 6n11, such as 6n1 6n11, as needed,"
Test example:
1, 12AT7 (Siemens) -L-screen 1
12AT7 (Siemens) -L-transconductive 1
2, EL34 (Datutton XF4) - Power 1
EL34 (Datutton XF4) - Crossing 1
Test conditions of 120V negative gate pressure 2V test conditions on 120V 12V test conditions 5.5mA / V
EL34 screen pressure 250V negative gate pressure 13.5V test conditions under the screen 100mA cross-conversion 11mA / V
The results of the actual test prove that this DIY test result is correct. Hao
It is very messy, and it is a friend who is helping me to help me and interested.
WBGDA 2007.06.29
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