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Test Equipment

This is some of the test equipment I have collected (and am still collecting) over the past few years.
It is all servicable and in use. Some of it is over 50 years old!.

An Admiralty Avo
A Universal Avo model 40 originally supplied to the Admiralty
Avo Signal Generator MK1
The first portable Avo Signal Generator
A B&K Transistor Radio Analyser
Model 960 Transistor Radio Analyst. Made by B&K Division of Dynascan Corporation.
Includes a DC supply between 0 and 12 volts in 1.5v increments.An AF generator for Audio tests and an RF output for setting up IF's. Has two valves inside both are 12AU7A Triodes.
Greyshaw CR50 Tester
Greyshaw CR Bridge. About 1953.
Kenwood DM81 Dip Meter
Kenwood Grid Dip Meter.
Phillips PM5324 RF Signal Generator
Phillips PM5324 RF Signal Generator.
ETEI Ltd Transistor Amplifier
A sturdy Transistor Amplifier. Germanium transistors throughout.Seems to have had something to do with the Film Industry.
Heathkit FET/Transistor Tester
Everyone needs at least one piece of Heathkit kit. This is a FET/Transistor tester.
Taylor 110B CR Bridge
Taylor 110B CR Bridge.
Weston E692 Oscillator
Weston E692 Oscillator.

The Weston Oscillator is from the 1930's and uses HL2K valves. The coils are the tubes on the LH side which plug in beneath the large silver cap on the RH side. It covers LW/MW/SW.There is space for the batteries inside the case.
All Wave Signal Generator Signal Generator Chassis
All Wave Signal Generator
Signal Generator Chassis. Picture 2 All Wave Signal Generator. Apart from the engraving on the front panel there are no other markings to indicate who made this. Even the chassis is clear of any form of identification. The generator powers and operates at both RF and AF frequencies. The only change I have made to it is to replace the coax connectors with BNC types.
Roy Morgan has emailed me about this generator as he bought one in the very early 1960's. He got it from Radio & TV Components (Acton) LTD, High Street, Acton, London W3 for the very low price of 3. As Roy states it appears to be built from war surplus (WW11) components. Roy also purchased a Heathkit Valve Voltmeter V7A in 1960 from the Home Radio (Mitcham) which he still has in working order.
Operating Instructions
Some information from Pete Lewis (G3EMF) on the Signal Generator.
I was talking on 40 metres this morning with some friends. and the subject of testgear cropped up. I made mention of a range of testgear produced by Radio & TV Components (Acton) Ltd. Out of curiosity, whilst checking my e-mails this evening, I did a quick search for R & TV, and thereby found your page. Amongst the equipment you show is an "All Wave Signal Generator" You say that apart from the front panel engraving there is nothing to say who made it etc. Perhaps I can help you on this. Radio & TV Components was owned by a chap called Dave Cohen, but eventually taken over by his son (Leslie, I think). In the fifties my father, George Lewis G3EMF ( I 'inherited' his call sign when he died in 1983) did most of Dave Cohen's design work and building. He designed the signal generator you have pictured, along with other pieces of test gear, all housed in the same cases. In the range was an oscilloscope, a wobulator (sweep frequency generator), the signal generator you show, and an alternative signal generator with the "magic eye" tuning indicator. (I have one of them here). I believe there was also an RCL bridge, but I'm not sure now if it was in the same case style. Most of them were actually built in our "back room" when we lived at Church Road, Northolt, in Middlesex. I was but a young man in those days (born 1947), but remember well all the boxes stacked up in our hallway, all waiting to be transformed. Incidentally, you made mention that the sig generator appears to be made from surplus components. In the main you are right. As I understand it, Dave Cohen had hundreds of those cases and didn't know what to do with them. So started the range of test gear !!! Dad's profession was a draftsman, and so he even did the artwork for the front panels. Every Saturday morning Dad would go over to Acton, more often than not taking me with him, to Dave Cohen's shop, to organise the week's requirements. Dave was not a techie, just an entrepreneur, and it was just a chance meeting between him and my father that started it all off. In the very early days, he ran a very small manufacturing business from his shed apparently, knocking out lampshades and such like. He progressed to owning a small junk shop, and one day when passing, Dad saw a small piece of equipment in the window. Just what he needed for some project or other. He asked Dave Cohen if he had the circuit for it. "Sorry mate" was the answer, "But I've some more out the back. So Dad worked out the circuit, and doing the decent thing let Dave Cohen have a copy. Dave paid him fifty quid there and then (in those days!) and so started a long relationship. So there you have it; a brief history of your signal generator. There were lots of other bits and pieces as well, such as TV convertors to convert all the single channel sets ready for ITV's first transmissions in London in nineteen fifty something. Hundreds of 'em, all stacked up in the hallway again. Hope this is of interest to you. Regards Pete G3EMF
Avo Model 8 The Avo model 8 is the standard Avo in use by anyone who works with valve equipment.
It allows test results to have the same value they would have had before the days of the high impedence digital meter.
Murphy Multi Ratio Mains Transformer Manufactured by Murphy Radio Ltd this has the potential to be a very useful item.
From a 240 volt input the following ac voltages are availiable as output.
Top row 1 volt, 2 volt, 2 volt, 5 volt all can be switched to the output terminals with the complete row giving 10 volts.
Middle row 10 volts 20 volts 20 volts 50 volts. Total 100 volts.
Bottom row 100 volts 200 volts giving a total of 300 volts.
Hence the total output is 410 volts. Ideal for creating a wide output dc power supply from LT to HT.
It needs a new coat of paint and remarking. Plus some rewiring and a new neon.


Last updated 1.2.2010

2003-2010 © Maurice Woodhead