The Jewel Radio
(by Gerry Wells in BVWS Bulletin 2002. Colour images are my radio)
Very few people will have heard of Tuskite. Very few people in the radio trade will have heard of it either. If you lived in or around Marsh road in Pitsea, Essex and had a Vange 3 number telephone then you would have been aware of the factory that called itself Armand Taylor & Co Ltd. You would also be aware of a peculiar smell that emanated from this factory. What you could smell was the process of Bake-lizing paper to form what is commonly known as Paxolin. | |
The factory is run by a charming lady called Josephine. |
I can only assume that she is the daughter of Armand Taylor. In 1957 this very worthy company decided to produce a radio set called the Jewel. I get the impression that they intended to make about five thousand of them: in actual fact only 1000 were produced. I worked through out from the serial numbers. They were all six figure and started with 111000, I have never found anything beyond 111999.
Up until March 2001 I had only been aware of one: that is in Jonathan Hill's 'Radio Radio' figure 785. It was on the 23rd February that I had a telephone call from Josephine. She informed me that she had a factory that had been out of use since 1957. She further stated That she wanted to sell the factory but it was full of radios and unwanted stock.
She said that she had a possible buyer but she would have to get the factory completely emptied. It had to be done in a hurry and I could have it all for nothing; all I had to do was collect it. I Told her that I was off on holiday The following Monday, down to Lakeside on Hayling Island.
I Telephoned John Thompson who had a very large Citroen hatchback car. He agreed to contact Josephine and collect the contents of the factory. He cleared everything. He made seven journeys from Pitsea to Dulwich. When I came home a week later, I found my whole dining room two feet deep in clag.
Gerry & helpers re-assemble stock |
Although they were very fine little sets they were all valve-ed and the transistor was on It's way in. In spite of the fact that I have been continually involved with radio for sixty years, I have not met anything like this sort of design before. The designer was one hell of a genius.
If you examine the accompanying circuit you will wonder what the blazes is going on. If you take a close look at the chassis you will be convinced that the man behind it was no ordinary set designer.
The set is quite usual for the first three valves ie: DK92, DF91 and DAF91. It has a small Three-waveband coil pack that they designed and made themselves and 2 IF transformers that looked odd, two wires came out of each end and their trimmers were on the side of the cases.
You would then spot a weird object that was where the tuning condenser would normally be. This object was their own patent tuning system. It was about the same size as a normal tuning gang.
It consisted of 2 oval pieces of Paxolin or Tuskite, A layer of very fine neoprene or latex (the sort That is usually found in clinics) was glued to the copper sheets on the drum. A strip of copper sheet was fixed to the drum, but well insulated tram the inner copper strips. It is wound round about one and a half Turns and returned to a shaft with a slot in it and wound round until it is fully wound. A drive cord was fitted to the shaft with a big knot and the other end wound round the drum against the spring. The copper outer was then earthed.
I have played with this device for hours to see how it worked and have tested it for capacitance and losses. It gave a good 500 pF on each half and didn't seem to be too lossy.
As you will see the rest of the set is fairly conventional apart from The output stage and power supplies The three battery valves have their filaments in series and are placed across a resistance network in the cathode of the UL41 output valve. A small amount of anode to anode feedback is applied to the output stage.
Josephine (owner in 2000) |
It is then smoothed in the usual way and a 40mA pilot bulb is in series with the rest of the set This bulb flickers m time with the music and is placed on the forehead of the figure of an Asian woman, which forms the main part of The Tuning dial.
Most of the 200 sets had case parts missing. There were no lop plates that hold the case tube into place with chrome plated dome nuts (1/2 CWT of dome nuts) The case is an oval tube 8 inches by 8 inches. It has a pattern of 3/4 inch holes punched in it on either side. The whole tube is covered with cloth, a wide variety of cloths had been used, a great many tartan patterns and a lot of caravan curtain styles. I think a few country and western shirts crept in as well.
A few case tubes were unusable, well nibbled or covered in a white fungus. The first thing I had to do was make up the oval top plates. I used 1/4 inch MDF for this and covered them in brightly coloured felts.The cabinet case outer tubes were quite easy to form up, I made up a solid wooden mandrel and bought several rolls of the heaviest lining paper that you can get. I cut up the rolls on a fine-bladed circular saw. This meant that I could get eight cases out of each roll. I then coated the paper with wallpaper paste and rolled them over the mandrel, fixed them with string, then took them off the mandrel before they had realized what had happened.
I stood then in rows to dry before putting them on a jig to punch holes in them, I got Eileen to go round to all the local shops to get any suitable material. She did very well and even came back with cloth with teddy bears on.
It now came to the time to make the set work and see how well it performed. I picked a set out at random and gave it to one of our little old men to take home to his prefab in Lewisham, Ted did a first class job on it. He told me that it performed very well and sounded very fair. He was kind enough to draw me out a first class circuit diagram with all the component values on it.Although Ted has been in the radio repair trade all his life and is seldom beaten, he did state that this set was rather like a City and Guilds test piece with every fault known to man in one chassis. He had to admit that it was beautifully put together and the soldering was perfect even if the UL41 valve holder was back to front and the electrolytes were in backwards.
Up to date (2001) I have completed about fifty of them and sold a few, given a few away as presents and made sure that everyone at the museum has one whether they want one or not.