Full high performance digital tube tester kit, wired, adjusted & ready to use.
Full manual available here:
https://www.radioelec.com/images/Image/Documentation/DuoKit_3_user_guide.pdf
This kit is an evolution of the Duokit 2 of which it has all the characteristics but the plate voltage can go up to 500v against 450v for the Duokit 2.
This kit consists of a main card shown in photo 1 and a set of pre-wired peripheral elements + power sources, shown in photo 2.
Photo 4 is a view of the ready-to-use assembly.
Important: The heater power supply is not included in this kit because many users already have a suitable transformer. A regulated triple voltage power supply module (4v - 5v - 6.3V / 4A) is available on request.
The characteristics and performance are vastly superior to the whole traditional lampmeters and can measure a very wide range of tubes including valves, diodes and magic eye.
The display is shown in photo 3. It indicates the test parameters and the result in real time:
A: Plate voltage, adjustable from 2 to 500V +/- 5%
G2: Grid voltage 2 (screen), adjustable from 10 to 350V +/- 5%
G1: Grid voltage 1 (polarization), adjustable from 0 to -100V +/- 5% by 10-turn potentiometer
The plate current is displayed in 2 ranges in the lower right corner:
0 to 34mA, display on 2 digits + one decimal: XX, XmA
> 34mA, display on 3 digits: XXXmA
The maximum measurable current is 340mA for all types of tubes.
Complete documentation on request by giving me a valid e-mail address.
Summary of features:
Dimensions:
Module: 130 mm x 110 mm maximum height 30mm
Backlit LCD display: 25 x 70 mm.
Single power supply: 110/230 V or on 12V battery via a converter
offered as an option.
Power from mains: 25W (35W max.) On mains and approximately 2A on 12V battery
Plate voltage: adjustable from 2 to 450 V
Screen voltage: adjustable from 10 V to 350 V
Grid 1 voltage: 0 to - 100 V (by 10-turn potentiometer)
Plate current range: 0 to 340 mA in 2 automatic sub-ranges: 0 to 34.0 mA (resolution 0.1mA) then 34 to 340 mA (resolution 1mA)
Neon short-circuit indicator in the plate.
Short-circuit protection: total
Overall accuracy: +/- 5% +/- 1 digit
Note: These values are real, the use of a microprocessor allows a ultra fast measurement mode which minimizes power feed .
Few traditional lamp meters are capable of such measurements because they require heavy and bulky power supplies - the famous Metrix 310, for example, is limited to 100 mA of plate current.
The operation of the device is very simple: test parameters are adjusted, by means of 3 potentiometers, anode voltage, screen voltage (for tetrodes, penthodes, etc ...) and the bias voltage gate at the desired values and, simultaneously, the plate currentcorresponding is displayed on the lcd screen.
The measurements are carried out at a rate of 2 per second which allows continuous reading parameters and result.
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