Photos of these items are on this web site
I am looking for a manual or even just a circuit for this item.
Now this item is interesting. I picked it up in a junk shop in Eastern Victoria and the story that came with it was that it was part of a collection of radio and TV "stuff" that was in a Radio and TV shop that had been shut and abandoned about 20 years before. When the owner died much of the stuff went into a skip but some of it was rescued.
The power source for it is 6 Volt DC as it has a vibrator supply built in. Does anyone know any more about it ?
This was battery powered but someone had tried to convert it to use FET devices instead of the original valves. Looking at the metal work there was also a mains operated version as there is a hole for a power transformer where the HT battery holder is.
The conversion was not a success and I borrowed a 240 Volt version and rebuilt it as that version. By some fluke of nature, the power transformer from an old Astor Mantle radio fitted into the cutout for the transformer and the bolt holes lined up. There was also a spare valve socket hole for the rectifier. When I finished the rebuild I was quite surprised how close the dial calibration was on my unit and the one I had borrowed.
Looks like an updated version of the one published in the December 1954 edition of Radio and Hobbies. It uses a different amplifier valve and has the addition of a bridge gain control. The front panel and metal work look like it was a kit or a class project.
It has a 6X4 recitifier, a 6U5 Magic Eye. a 6U8 and a germanium diode. This is where it differs from the RTV&H circuit, it used a 6N8 pentode and its built in diodes.
It does not work properly and I suspect there is a wiring fault in it. When I get time I will trace the circuit and see what is going on. If someone has more information it would be appreciated.
I was not sure of the origin of this until I found a little sticker on the bottom of the VTVM and guess what is said ! RTH Jan 1956. I have the RTV and H collection on CD, a great resource.
Would anyone have a meter clear plastic cover in better condition ?.
I have two of these, the other one has no AC power supply and it requires a new dial glass.
I have had this one since I was sixteen years old.
I need a new neon lamp for the short tester, the old one has fallen apart inside.
I have had this working recently, listening to Test Cricket on it. I have started to make a new meter scale for it.
Written by and Copyright, Phil. Storr © Last updated 14th February 2011