Equipment information:

AVO Valve Tester Type 160 Valve characteristic meter
Manufacturer:
AVO
Model: Valve Tester Type 160
Date:
Category: Measurement instruments
Group: Valve characteristic meter
Description: Valve Tester
Information:
                                    Introduction
1. Whilst good/bad testing on a semi-production basis will
undoubtedly be the major use for this tester, it is certain
that the instrument will find considerable use in
laboratories and service departments where engineers and
skilled personnel will be available, and where more precise
details of valve performance can be used to advantage. To
this end, additional facilities on the tester, enable Ia/Va,
Ia/Vs and Ia/Vg characteristics to be plotted over a wide
range of voltages, these being readily available from the
calibrated panel controls.
Principles of Operation
2. The tester is basically designed to check the valve
according to its static characteristics which would normally
require the provision of the requisite range of variable dc
supplies. The difficulty lies in the regulation problems
involved in the supply of the wide range of dc anode and
screen voltages, on which the loading might vary from a
fraction of a mA to over 100 mA, dependent on the type of
valve being tested, and the nature of the test being
performed. Such a requirement could of course be met by the
provision of a number of regulated power supplies, which
would render the instrument cumbersome and expensive, whilst
a large amount of metering, would not only mean additional
expense, but also make the instrument difficult to use, and
would not entirely overcome the problem.
3. It can be shown, however, that if alternating electrode
voltages are applied in their correct proportions, an
amplifying valve can (by virtue of its property of self
rectification) be caused to give dc anode and screen
currents which for all practical purposes bear a constant
relationship to those obtained from its dc static
characteristics.
4. This immediately simplifies the problems of power supply
to the valve under test. The design of transformers to give
negligible regulation errors over the range of secondary
currents involved is comparatively simple, whilst the range
of electrode voltages may be simply provided by a
predetermined secondary tappings selected by calibrated
switches, thus minimising to a very large extent problems of
size, weight and cost, and eliminating the necessity for
separate metering.

These manuals are available for the above equipment:

AVO -- Valve Tester Type 160 -- Service and User Manual
File name: AVO-6003-Manual-Page-1-Picture
Manual Type: Service and User Manual
Pages: 42
Size: 12.66 Mbytes (13269970 Bytes)
Language: english
Revision:
Manual-ID/Number:
Date:
Quality: Scanned document, all readable.
Upload date:
MD5: 7664142e6cb2bb899e82b712b1821ca0
ed2kID: 01abfffb449f863635c27a6c04ccc50a
Downloads: 127 since 10 May 2014
Information:
Summary of Data .. .. .. .. .. .. .. ,. .. 3 CHAPTER 1.
TECHNICAL DESCRIPTION
1 Introduction .. .. .. .. .. .. .. .. .. .. 5
2— 9 Principles of operation .. .. .. .. .. .. .. .. 5
10—21 Basic Circuits .. .. .. .. .. .. .. .. .. 6
22—25 The Valve Holder Panel .. .. .. .. .. .. .. .. 11
26 General Construction .. .. .. .. .. .. .. .. 13
27 Mains Supply .. .. .. .. .. .. ,. .. .. 13
CHAPTER 2. THE VALVE PANEL AND CONTROL UNIT
Λ
28—33 The Valve Panel and Selector Switch .. .. .. .. .. .. 14
34—36 Procedure for setting up Valve Base Connections .. ..
.. .. 15
37 Provision for new Valve Bases .. .. .. .. .. .. .. 17
38 The Control Unit and its Function .. .. .. .. .. .. 17
39—41 The Mains Voltage Selector .. .. .. .. .. .. .. 17
42—47 The Circuit Selector . . .. .. .. .. .. .. .. .. 18
48 The Electrode Selector .. .. .. .. .. .. .. .. 18
49 The Heater Voltage Switches .. .. .. .. .. 18
50 The Anode and Screen Voltage Switches .. .. .. .. .. 19
51—52 The Anode Current Controls .. .. .. .. .. .. .. 19
53 The Negative Grid Volts Control .. .. .. .. .. .. .. 20
54 The Set mA/V Control .. .. .. .. .. .. .. 20
CHAPTER 3. OPERATING INSTRUCTIONS AND GENERAL PROCEDURE FOR
TESTING
A VALVE
55 The connection of the instrument to a supply voltage ..
.. .. .. 21
56 Final setting of Mains Voltage Selector Panel .. .. .. ..
.. 21 57—59 Insulation checks with the valve cold .. .. ..
.. .. .. 21 60—61 Insulation checks with the valve hot .. ..
.. .. .. 22
62 Cathode to Heater insulation check .. .. .. .. .. .. 23
63—69 Determination of valve condition from Static
Characteristic Data .. .. 23
70—71 To check relative goodness of valve in conjunction
with coloured comparison
SCcilC « * · # « * · « t · * * * * o · mm » a O ·
(a) Using recommended anode current .. .. .. .. .. .. 24
(b) Using recommended negative grid voltage .. .. .. .. ..
24 72—73 To check valve by direct reading of mutual
conductance (mA/V)
(a) Using recommended anode current .. .. .. .. .. .. 25
(b) Using recommended negative grid voltage .. .. .. 25
74—75 To check valves having a mutual conductance less than
ImA/V .. 25 76—77 Measurement of Grid Current .. .. .. .. ..
26 78—84 Checking Power Rectifiers .. .. .. 26
85 Checking Signal Diodes .. .. .. .. .. 27
86 Instructions for testing specific valve types .. .. .. ..
.. 27 87—88 Multiple Diodes and Rectifiers (D, DD, DDD, R,
RR) .. .. 27 89—91 Diodes and Rectifiers combined with other
electrode assemblies (DT, DDT,
DP, DDP,
DTP).......................................................................................................
28
92 Double Triodes and Double Pentodes (TT,
PP)..................................................... 28
93—97 Frequency Changers (Η, TH, O, TP) .. .. .. .. .. .. 28
98—99 The use of the Links on the Valve Panel of the
instrument .. .. .. 29
100 Checking Tuning Indicators (TI) .. .. .. .. .. .. 30
101 Checking Gasfilled Rectifiers (GR) .. .. .. .. .. .. 30
102 Checking Cold Cathode Rectifiers (CCR) .. .. .. .. 30
APPENDIX 1. SCHEDULE OF SPARE PARTS
............................ ............................ 31
AVO-6003-Manual-Page-1-Picture
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