A French made tube tester for both American and European tubes since 1950.Voltage selector 110-245v 50Hz. Dimensions H450 - 340 - D165.
It was made in Canada by Stark Electronics Instruments.The TV-7 series are built like tanks and seems to me, to be one of the best designed tube testers ever made. They are based on a Hickok design and are great for testing real old tubes prior to WWII. It will test many, but not all, tubes made after WWII.
WestonModel 981-3 Tube Tester.
High quality components with welded steel case Tests for Mutual Conductance (Gm), Shorts, and Tube LifeTests both sections of dual section tubes without resetting selectors Seven Plate & Screen voltages up to 225 VDC and Bias voltages to -20 VDC. Four grid signals at 4000 Hz. Nice, smooth built-in roll chart6L6GC under test in pictures 4 & 5 = 2000 X 3 = 6000 micromhos. Nice case--almost mint
Specifications of AVO CT 160
|Tests||Filament, Insulation, cathode/heater leakage resistance to 25M ohms, gas, current draw, mutual conductance.|
|Bases||British 4/5/7/9 pin (B4/B5/B7/B7A/B9), P type base (8SC), International Octal, Mazda Octal, UX4, UX5, UX6, UX7, American SM7, American loctal (B8B or B8G), B9D, B8D, Hivac 4 pin (SM4), Hivac 5 pin (SM5), B7G (miniature), B9A (noval), B3G, 5AA and 7AA for Acorn valves, F8, B8A, B5A. |
Two uncommitted clips which can be connected to top cap or side cap connections.
|Mains||Selectable 105-120 in 5V steps, 175-250 in 5V steps @ 50-500Hz. AC.|
|Heater||0.625, 1.25, 1.4, 2.0, 2.5, 3.0, 4.0, 4.5, 5.0, 5.7, 6.3, 7.5, 10, 11, 12.6, 13, 15, 16, 18, 20, 23, 25, 28, 30, 35, 40, 45, 48, 55, 70, 80, 117|
|Anode||20, 40, 60, 75, 90, 100, 150, 200, 250, 300, 400|
|Screen||20, 40, 60, 75, 90, 100, 125, 150, 200, 250, 300|
|Grid||Continuously variable from 0 to -40V.|
|Other||Measures anode current up to 100mA, gm from 0-20mA/Vm, diode/rectifier efficiency, short circuit protected.|
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My beautiful Tube testers
After long time i deside to pick up from my basement sorage my Tubetesters .
So i have to make some cleaning and restoration on them .
until then have some view of them.
I have to make some changes on old caps and resistors as well on soldered components.
One British one French and two from the States. There is no manual from AVO.