$160.0 Buy It Now or Best Offer
free,30-Day Returns
Seller Store elecmall
(3653) 100.0%,
Location: zhejiang
Ships to: US,
Item: 166702931116
Return shipping will be paid by:Buyer
All returns accepted:Returns Accepted
Item must be returned within:30 Days
Refund will be given as:Money Back
Country/Region of Manufacture:China
MPN:Does Not Apply
Unbranded:Unbranded
VACUUM TUBE TESTER KIT LIST: 1x main board 1x LCD display 1x 0-115-230v 10VA transformer 1x AC-DC 9V 1A power supply 1 set wires (with potentiometer and switch) 3 x potentiometer knobs This kit has no heating power for the tube filament, if you don’t have any heating power, please check another listing, here is the link: https://www.ebay.com/itm/166687736091 We also have a front panel for the tester, here is the link: https://www.ebay.com/itm/156158990830 ( Please note this front panel doesn’t include the heating power.) This tester is ready to use and can work with most audio tubes, from small triodes: 12at7, 12au7, 12ax7,6sl7,6sn7 to power triodes / pentodes like: 2a3, 300b, el84, 6v6, 6l6, el84, el34, kt66, kt88, etc… Transconductance ( Gm ), Internal resistance ( Rp ) and Gain ( µ ) can easily be calculated using 2 simple measurements. Rectifiers and diodes can also be tested. User guide of the tester: 1 GETTING STARTED AND OPERATING THE SYSTEM Getting started is very simple, because most of the elements are already connected. You only need to plug the different connectors , followed by the T1 and T2 to the mains using a switch and a fuse 1A. Connect the four wires (cathode, G2, plate and G1) to the appropriate tube socket pins. Do not forget to slide the ferrite beads on to the wires (except for the cathode). Connect a transformer or an appropriate power supply to the tube’s filament socket. Make sure that the module is on an insulated support and that there is no short circuit that can possibly occur. Switch on power. Pre-adjust the V plate voltage (Plate), Vg2 (grid 2)*, and Vg1 (grid 1) according to the characteristics of the tube to be tested. Example of measurement : EL84 tube, the datasheet indicates : Pin 2 : G1 (grid 1) Pin 3 : K-G3 (cathode and grid 3) Pin 4 : F (filament) Pin 5 : F'(filament) Pin 7 : A (anode and plate) Pin 9 : G2 (screen or grid 2) Test conditions : In the absence of indications just refer to the curves. According to these curves, it would be possible, for instance, to choose a plate voltage of 300V, a G2 voltage of 250V and a G1 voltage of -4.0V. Under these conditions, the nominal debit would be 90 mA. 1 Set the display voltage selector as to show the plate voltage.2 Turn the Vplate potentiometer to get a 300V reading on the screen.3 Set the display voltage selector as to show the G2 voltage.4 Turn the Vg2 potentiometer to get a 250V reading on the screen.5 Turn the Vg1 potentiometer to get a -4.0V reading on the screen.6 Plug the tube and leave it to heat up for about one (1) minute. *Choose the corresponding displays by using the voltage switch. Check that the neon indicator is turned off or is blinking. For certain tubes, this light could be turned on continuously without blinking even if there is no short circuit. In general , this kind of phenomenon is created by tubes which have high transconductance or power or by valves and cathodic indicators. It is not dangerous to carry out tests even if the light is turned on. Push on the “TEST” button and read the value of the plate current in mA. · Release the button. The test is completed. More measurements : transconductance , internal resistance and gain are possible and simple. Tubes matching is done by a simple method. Test several tubes of the same type without changing the adjustments in order to pair up (or in quartets) tubes with plate currents whose measurements are closest. For double tubes like : ecc81, ecc82, ecc83, ecc88 – 6sl7, 6sn7, etc…The measurement of any of the internal triodes can be undertaken by swaping the connection to either the plateof triode 1 or triode 2 ( all other same electrodes connected together ). This can be easily undertaken with a simple inverter. The testing of valves, diodes , cathodic indicators, gas regulators is possible and described on §6. 2 OPERATING PRINCIPLES Using an impulse mode, the tests are carried out every 0.5 seconds. The time lag for obtaining the results is very short : 800 uS (0.0008 seconds). Between the test windows, grid 1 is at a negative potential and the tube is in a cut-off state. Its dissipation is almost non-existent. This mode allows for the use of very little energy on the high voltage supply (plate and G2), and prevents the use of heavy and costly transformers, while at the same time allows for tests using high voltage and plate current (450V / 340mA). A microcomputer PIC clocked at 12MHz carries out the acquisiton , measurement and management of defects and of the commands for the LCD display. The plate supply is organised around an self-oscillation converter (Royer) controlled by a comparator. A high-value condenser (47µF) serves as a reservoir and supplies the voltage during the800µS test. This condenser discharges slowly. When the plate voltage has to be lowered, through the Vplate potentiometer, it would be useful to briefly push the DISCHARGE button, which would put a discharge resistance in parallel with the supply output and accelerate the process. SURCHARGE warning (see below) could then be displayed, and will disapear when the button is released. The G2 supply, which has a lower debit, is organized around a conventional circuit : transformer, rectifier, filter, stabilization using a group of zener diodes. A power mosfet controlled by the Vg2 potentiometer delivers the G2 voltage. These two supplies, plate and G2, are protected by current limiters. The peripheral circuits also have this type of protection. The display of the plate and G2 voltage is carried out in an alternating manner through selection, using the voltage switch (connector J1 – pins 4, 5 and 6). The G1 supply circuitry is like G2 but because of the low current, it is not buffered. A short circuit tester for the plate and the internal electrodes of the tube is effected through a neon light (connector J2, pins 8 and 10). This neon lights up continuously in the event of a strong current. Otherwise, it will blink or will remain extinguished. This simple circuit is just an aide for the tests and has its limits. It could stay lighted up continously when used with high power tubes or tubes of a specific type (diodes, magic eyes…) are present. Some tubes are very unstable and the connection wires can be seen as resonant circuits. Likewise, the plate, G2 and G1 wires have to be equipped with a ferrite bead filter to block any possible auto-oscillation. These beads have to be positioned beside the tube socket closest to the connections. The microcomputer monitors the plate voltage current. All excess will automatically limit the output voltage, SURCHARGE will appear on the screen, and all tests will be suspended until the problem disappears or until the TEST button is released. 3 ADVANCED TESTS The cathodic current of a tube is an important element to determine its state and to carry out matching. Nonetheless, this parameter gives only a preview of the tube overall performance. With the DuoKit you will be able to carry out three other very complementary tests, which are : · The slope or transconductance : Gm : expressed in mA/V, uS or umhos · The internal resistance Rp : expressed in Ohm · The gain µ which is the result of the two preceding values Testing the slope : Carry out a first test, and note the corresponding cathode current Ik1. Without making other adjustments, increase or decrease the voltage on grid 1 (Vg1) by one volt, and note the new cathode current Ik2. The Gm ( transconductance ) is the difference between the lk1 and lk2 currents, expressed in mA / V, or in uS, or in umhos, by multiplying the value by 1000 : 1mA/V = 1000 uS = 1000 umhos. This feature, measured on several points, enables one to know the linearity of a tube. Testing internal resistance : Carry out an initial test, note the Vp1 plate voltage and the corresponding lk1 current. Without making other adjustments, increase or decrease the plate voltage (Vplate) until a significant change in the current is created. Note the new value of the Vp2 plate voltage and the new lk2 current. The internal resistance Rp is the difference of the plate voltage divided by the difference of the corresponding currents : Vp1 – Vp2 divided by Ik1 – Ik2 Calculating the gain : As indicated above, the µ gain is equal to Gm (in mA/V) x Rp All tube features are then known, and a very precise matching can thus be made. 4 VALVES, REGULATORS AND CATHODIC INDICATORS Testing particular tubes like diodes, valves, rectifiers, gas-regulated tubes and cathodic indicators can be done with the DuoKit. Diodes : With the internal module supply, low-power tubes can be tested to a maximum current of approximately 15 mA,. For currents above this, follow the procedure for valves testing. Before plugging the tube, turn the Vplate potentiometer fully anti-clockwise and, if needed, push the DISCHARGE button several times to bring the plate voltage to a value < 5 volts. The connection is done similarly as for other tubes : wire K to the cathode and the Plate wire towards the plate (s). When the tube is hot, slowly turn the Vplate potentiometer and observe the increase of the current, comparing it to the curve presented in the tube specifications. Valves : Valves or rectifiers tubes can be partially tested with an internal plate supply of the module. However, the absence of the command grid prevents the operation of the impulse mode, and the permanent debit may exceed the capacity of this supply. In this case, use an external variable d.c. supply. This d.c. supply will be adjustable from 0V to the desired voltage (depending on the curve of the tube). Minus of the supply will be connected to GND (J2 pin1 or 2), and the positive pole to the terminal corresponding to the plate (s). To the tube socket but not to the module plate wire. The connection and the sequence of tests are identical to the diodes. Gas-regulated : The test of these tubes is carried out with a resistor in order to limit the current. The xxx voltage will be seen directly on the display. Connections between terminal K and plate. Cathodic indicators : The test for luminosity of these tubes can be done simply by connecting its electrodes to the appropriate terminal and by adding the resistance to the plates, according to the schematics of the manual. 5 Technical features Main Board's Dimensions : 146 x 133 x 28 mm ( L x W x H. max ) Power Supply : 220V – 230V or 115V / 50-60 Hz or 12V DC via DC to AC converter Power request : 25 to 35 VA max. Approx. 2 amps under 12VDC, via DC to AC converter Protection fuse : 1 A fast fuse (5 x 20 mm) Measurement mode : pulsed, 8 bits / 12 MHz micro-computer Adc sampling : 10 bits monotonous ( 1024 ) Measurement window : 800 µS Interval between measurements : 0.5 second Measurement accuracy : better than 5% ± 1 digit Grid 1 voltage: 0 to -100 volts Grid 2 voltage :0 to 350 volts Plate voltage :0 to 450 volts Maximal mesurable plate current : 340 mA Grid 2 supply max. current: 60 mA Grid 1 display resolution: 0.1 V ± 1 digit Grid 2 display resolution: 1 V ± 1 digit Plate display resolution: 1 V ± 1 digit Plate current display resolution: 0.1 mA ± 1 digit until 34 mA 1 mA ± 1 digit for I > 34 mA Internal short-circuit protection. Optional AC-DC regulated supply for tubes heating : Output current: 3.5 A maximum Output voltage tolerance : better than 5 % ( regulated )
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