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Valve Characteristic Meter MK 1

Valve Characteristic Meter MK 1; AVO Ltd.; London (ID = 2144687) Equipment Valve Characteristic Meter MK 1; AVO Ltd.; London (ID = 2144688) Equipment
Valve Characteristic Meter MK 1; AVO Ltd.; London (ID = 2144689) Equipment Valve Characteristic Meter MK 1; AVO Ltd.; London (ID = 2144690) Equipment
Valve Characteristic Meter MK 1; AVO Ltd.; London (ID = 2144691) Equipment Valve Characteristic Meter MK 1; AVO Ltd.; London (ID = 2144703) Equipment
Valve Characteristic Meter MK 1; AVO Ltd.; London (ID = 2144704) Equipment Valve Characteristic Meter MK 1; AVO Ltd.; London (ID = 2144705) Equipment
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Valve Characteristic Meter MK 1; AVO Ltd.; London (ID = 2144687) Equipment
AVO Ltd.; London: Valve Characteristic Meter MK 1 [Equipment] ID = 2144687 1400x1317
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For model Valve Characteristic Meter MK 1, AVO Ltd.; London:
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Country:  Great Britain (UK)
Manufacturer / Brand:  AVO Ltd.; London
Year: 1947–1950 ? Category: Service- or Lab Equipment
Wave bands - without
Details
Power type and voltage Alternating Current supply (AC) / 100-115; 200-215; 220-230; 240-250 Volt
Loudspeaker - - No sound reproduction output.
Power out
from Radiomuseum.org Model: Valve Characteristic Meter MK 1 - AVO Ltd.; London
Material Metal case
Shape Tablemodel, slant panel.
Dimensions (WHD) 18 x 11.5 x 12.75 inch / 457 x 292 x 324 mm
Notes

First model of the AVO Valve Characteristic Meter, very different from the 2-panel valve tester it superceded.  The later Mk. 2 looked similar but with added handles on the front panel, a larger back opening, and longer legs to allow a book to be stored underneath.  Later models had an EA50 rectifier in the screen circuit, instead of a metal rectifier.

The valve anode and screen circuits are fed with a.c., the valve under examination being it's own rectifier.  The meter is a d.c. moving coil type.  The standing current is opposed by a backing off circuit, then a d.c. bias applied to the control grid, and mutual conductance read off the meter.

Filament voltage: 1.1 to 126 v. a.c.

Anode voltage: a.c. rectified by the valve under examination.  Equivalent to 0 to 400 v. d.c.

Screen voltage: a.c. rectified by the valve under examination.  Equivalent to 0 to 300 v. d.c.

Control grid voltage: 0 to -100 v. d.c. in 2 ranges.

Can test diode and rectifier emission.

Can measure inter-electrode leakage hot and cold.

The gas test switches a resistor in the control grid circuit to detect grid current.  The anode current being altered by the change of control grid bias thus developed across the resistor.

Model page created by David Jones. See "Data change" for further contributors.



All listed radios etc. from AVO Ltd.; London
Here you find 65 models, 64 with images and 34 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.




  
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