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THE GREAT MULLARD MAGIC BLOG — mhsvt

SISTERS DOING IT FOR THEMSELVES AND KEEPING IT IN THE FAMILY

Posted by STEVE M on

SISTERS DOING IT FOR THEMSELVES AND KEEPING IT IN THE FAMILY

Today's blog entry shows a press photograph and article from the Wandsworth Beagle newsheet from 1954 and was taken at the Mullard Equipment Factory at Wandsworth. It shows Betty Calf, Hetty Calf and Lettie Calf assembling Mullard High Speed Valve Testers - truly a family affair - and not a tin of pineapple rings to be seen!  I wonder if anyone will 'get' that last comment - answers on a postcard............................

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I SAY, BASE ADAPTORS FOR YOUR VALVE TESTER - SIMPLY SPIFFING!

Posted by STEVE M on

I SAY, BASE ADAPTORS FOR YOUR VALVE TESTER - SIMPLY SPIFFING!

May 1854 brought a useful accessory addition to the Mullard High Speed Valve Tester (MHSVT).  Developed in conjunction with Messrs. Spear Engineering of Warlingham the range comprised of eight adaptors to facilitate the testing of valves for which no existing valve base was provided on the instrument. These were precision items, with the bodies of the adaptors being trned from duralumin - usually reserved for aircraft bodies - and just look at the adaptor below for testing the EY51 boost diode - impressive huh? The adaptors were engraved 1-8 with the figures clearly identifying each adaptor body and were priced...

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1953 BRINGS NEW ACCOUTREMENTS FOR THE MULLARD HIGH SPEED VALVE TESTER

Posted by STEVE MYCIUNKA on

1953 BRINGS NEW ACCOUTREMENTS FOR THE MULLARD HIGH SPEED VALVE TESTER

If you felt that a trolley fulfills three important requirements - i) to serve as an attractive self-contained counter; ii) to serve as a compact storage facility; iii) to serve as a mobile platform then you can understand why Mullards commissioned Domain Products of Barnby Street, London to manufacture a purpose built trolley to store your MHSVT on.        This might look like a hospital trolley but it differed in that it could be easily dismantled Ikea style by the removal of eight clamp bolts and it had two hooks on the back legs of the trolley for...

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A COVER FOR YOUR MULLARD HIGH SPEED VALVE TESTER

Posted by STEVE MYCIUNKA on

A COVER FOR YOUR MULLARD HIGH SPEED VALVE TESTER

In March 1952, if you wanted to spruce up your service department, you could buy a smart, dustproof, tailor-made cover in strong silverised leathercloth for your MHSVT.   It had red piping accents and was only 13/-. Here we see Hortense Balchin who stated that 'My Wilbert always said that a workman must care for his tools and they will go on to care for him." and she went on to demonstrate how clean this cover kept her Wilbert's instrument : -

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EXOTIC COMPONENTRY IN THE MULLARD HIGH SPEED VALVE TESTER

Posted by STEVE M on

EXOTIC COMPONENTRY IN THE MULLARD HIGH SPEED VALVE TESTER

At the time of introduction, two 'hollow state' devices the MHSVT contained were considered exotic.   The first, the 85A1 voltage regulator is a neon filled reference two electrode device which serves to provide the MHSVT with it's reference voltage stable in normal useage to 0.17% variance and over it's entire life. stable to within 0.5% of nominal value.     The second is the DG7/5 cathode ray tube which is an electrostatic medium persistance tube .    What is interesting is that this CRT is used in this application purely as a voltage indicator, measuring various currents by means...

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