Self-made daring front-level tubes tubes, Vacuum Tube Tester
Keywords: self-made bile preceding tube tube tester
Self-made daring front-level tube tube tester
Since I first listened to 6N4, I was "biliary", I really like the unique charm of the courage, but I like homemade, because the production of timid level needs to consider the output transformer The choice and purchase, especially the high-quality, high-quality, amplifier output cow is more expensive, and the fees for daring preparation are relatively low. If you use a professional-level listening to active speakers, then tun It will be easier to get, otherwise the speaker, speaker line, and the power amplifier variables are too much. Making the domestically produced tube, the import pipe can be selected, and there are often various types of various types of various types of various types of various types of various types of various types, and we must use professional tubes tester. As a majority of the amateur hobbies, it is difficult to have such conditions. Therefore, the author gerves the idea of making an electronic tube tester. The requirements should have the following functions: 1. Can test the normal or not of the tube, the new and old, can be used to pair. 2. Basically, most of the tubes commonly used in the production of timid stage are tested. By reviewing the circuits of the finished tube tube tubes and some articles for making an electronic tube tester, the author finally designed the following circuit, which can be tested by: 1. The tube of the big eight foot: 6N5P, 6N8P, 6N9P, 6N12P, 6N13P2. Small nine tubes: 12AX7 (ECC83), 12AU7 (ECC82), 12AT7 (ECC81), 6N1, 6 N2, 6N3, 6N4, 6N6, 6N11 (6H23, 6922, 6DJ8). The instrument can test the static screen flow of the tube, the DC amplification coefficient, and the parameters of the left and right triodes can also be paired.
How is the circuit diagram, not bad, let's take a brief introduction: Housing: Use an abandoned PC power housing, simply processed. Power transformer: It is also easy to use a high-pressure or custom-made power cow, self-made or custom-made, and a set of high pressure 240 ~ 260V, 40mA plus a set of filament voltages 6.3V, 3A. Reclusion Switching Element: Please refer to the circuit diagram to select an element that is much with a higher power to improve reliability and stability. The holder is forcaping, please choose a high quality product. The switches are three-knife, two throws, two knives, in the case of volume permissible, select the product that is high. I used two four-knit switches, and the filaments were adjusted in parallel with two knives. In order to increase overcurrent ability. The test button switch selects a button switch with self-locking. Current table: 5MA current files on the multimeter table can be used. Or install a 5mA current table on the instrument panel. Production: This tester is more wiring, it is best to connect the wire, gate, screen level, cathode, so that welding inspection is convenient. Since this machine has high pressure, please pay attention to safety when making commissioning, please pay attention to insulation when the board is installed, so as not to occur. Use: The machine is very simple, inserted with the tube, and the tube for the big eight feet and the 6n3 class does not have to consider the filament voltage, the 12 series ECC series of pipe K1 should be allocated to 12.6V gear. Notice! 6N4 should also dial 12.6V gear. Other 6 series of tube K1 should be allocated to 6.3V gear. After 1 ~ 2 minutes, you can read the screen stream value, and the switch k2 can be more than the parameters of the two tubes. Press the test button to estimate the size of the mutual rate according to the range of pointer swing. Mutual Romance Formula GM = (ΔLA) ÷ (ΔEG), that is, the mutual ratio is the ratio of the gate voltage variation to cause a variation of the screen current.
Upgrade: The instrument is relatively simple, requiring high friends to enhance its performance in the following ways: 1. Increase the regulator circuit for high pressure and filament circuit. 2. Install digital currents on the instrument panel to replace the pointer current table to read more accurate. 3. Add a tube to test other pipes, such as 5687, 6j1, 6j8, etc. 4. Adopt switching power supplies, you can increase efficiency and reduce weight. 5. Use a 6V battery, add a boost circuit, huh, it is portable, it is convenient to go to the second-hand market. Here are the values measured at the time of actual use, for reference only (except for the present, all of the merchant, called a new tube). (Current value: MF47 million Table 5 mA file, K1 is not closed; voltage value: A, B, DT83 million Table DC 1000V file)
Be
model
Screen current value K1 open (MA)
Screen current value K1 closed (MA)
Pressure K1 (V)
Remark
6n1t
1.70
1.90
90
-
6h1
1.75
1.90
86
-
6N11J
1.95
2.10
60
-
6h23
1.95
2.10
58
-
6h2
1.15
1.21
168
-
6n4
1.15
1.45
175
-
12AX7B
1.25
1.70
-
05-08-02
12AX7A
1.16
1.50
168
-
5751
1.35
1.60
146
second hand
6N3T
1.70
1.95
83
-
6h3
1.75
1.99
83
-
5670
1.75
1.91
90
-
2C51
1.65
1.95
93
-
6N10
1.90
2.05
54
-
12au7
1.80
1.95
69
-
6189
1.99
2.15
52
second hand
6201
1.51
1.80
116
Similar to 12AT7
6n6
1.85
2.02
61
-
6N8P
1.85
2.05
71
-
6N9P
1.25
1.45
152
-
6AS7
2.21
-
5.0
-
6n5pj
2.20
-
6.0
-
6n13pt
2.21
-
6.0
-
6AS7
2.71
2.78
6.27
130K 2W resistance change to 100K 4W
6n5pj
2.70
2.75
7.20
6n13pt
2.71
2.78
6.83
6N12PJ
2.29
2.51
59
Our other product:
