Beltona 3 valve battery radio

These are views of the outside and inside prior to dismantling and repair.

Beltona Trade Mark on top of cabinet and licence plate on underside of top cover

 

 

Reaction provided by rotating tickler coil inside main tuning coil. The tuning condenser (together with knob) is made by "Ormond" and has aluminium plates. The inter valve transformers are "Sutra" made in France (ratios 3:1 and 5:1) the anti microphonic valve holders manufactured by Aermonic (model H). Wiring as can be seen is bare tinned copper. Almost hidden by the coil is the combined grid leak resistor and capacitor made by "Lissen"

As can be seen the set was in a poor condition, the first step was to take the photographs shown above and to completely dismantle it and test each of the components. This revealed the following faults:

The front panel was polished with very fine wet and dry paper using white spirit as a lubricant to remove the deeper scratches and then polished with T-Cut automobile polishing compound. This was a lot of hard work! The base board was lightly rubbed down with glass paper and painted over with black drawing ink.

All the screws, nuts, bolts and small metal parts were dipped for about 30 seconds in lavatory cleaner (which contains hydrochloric acid) and then attacked with a tooth brush and finally rinsed in boiling water. The knobs, variable condenser and valve holders were washed in warm water and detergent using a toothbrush to remove years of dirt from the nooks and crannies. T-Cut was used to polish the front faces of the knobs. The dial graduations were filled using a white "Snopake" correction pen and polishing off.

The on/off switch was repaired using parts from a 1/4" jack plug and a small Bulgin knob which I happened to have and a a small piece of stainless steel was used to make a stop for the tickler knob.

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External view after rubbing down and polishing front panel and making new parts for the on/off switch

The wires on the tickler coil were replaced with non-authentic plastic insulated flexible wires and the open circuits were rectified by soldering the wires to the eyelets. The coils were then carefully cleaned and dusted and coated inside and out with one coat of shellac varnish.

The base of the detector valve was removed (only two pins required the heat of a soldering iron for it to be freed) the leads to the envelope were tinned and thin wires attached to aid re-assembly and make a better connection to the pins when the base was put back on. I used "araldite" 2 part epoxy for gluing the base back on. Although some people use super glue, epoxy takes longer to set and there is a chance to take it apart if you make a mistake.

The valve pins were cleaned using 000 grade wire wool and their diameter slightly expanded by inserting a blade into the slots.

 

The grid leak resistor was clearly faulty and when I removed the end caps and melted the wax inside a coated piece of serrated card terminated by two brass connectors was revealed. I drilled the end caps and soldered a modern replacement inside see next picture:

The next problem was the most troublesome, the primary winding (the one nearest the core) was open circuit. I decided to take it apart and rewind it, but when I saw how fine the wire was I realised that I would need to make a coil winder! In amongst my junk I had some salvaged parts from an IBM Quietwriter printer and sundry rods and brass bushes, The motor and one stage of reduction originally moved the carriage via a toothed belt. It worked and by applying a variable voltage between 5 and 12 volts it has more than sufficient torque for the job in hand. Unfortunately I was not careful enough when unwinding to ensure that the wire was wound evenly on the take up bobbin. This meant that on rewinding I had several breakages and a tedious job joining and insulating the breaks. Finally it worked, the transformer was re-assembled and I had a potentially working wireless.

My Do It Yourself coil winder made from scrap printer parts

Now the set was ready to be tested, temporary connections to bench power supplies with the valves connected in series ( I did not have a suitable supply for 2 Volts at 600 mA) a good aerial and a small moving coil loudspeaker connected via a step down transformer produced vicious squealing which was reduced by adjusting the relative position of the rotating coil on its shaft. With a bit of playing about with various HT voltages from 60 to 100 volts and experimenting with the grid bias voltage the set was able to pick up quite a number of stations.

The next job was to provide terminals on the back of the cabinet for the earth, aerial and speaker and then to make the terminal strip which you can see at the extreme left of the base board onto which I could terminate the battery connections. This was made from a piece of Bakelite and the screw connectors from a vintage telephone junction box. The loose wires are those which once the set was slid into the cabinet would be connected to the terminals on the back panel. Tinned copper wire for the parts of the circuit that needed replacement was obtained by stripping some old mains wiring cable (modern cables use bare copper conductors)

Inside view after refurbishment

Finally I made the power supply shown below, The most suitable transformer to hand had a 32V centre tapped winding and a 16V centre tapped winding. By removing the outer insulation and separating the tapping on the 16V winding I ended up with a transformer with one 8V and one 40V winding. The HT supply was provided by making up a voltage doubler circuit and the GB supply was provided by inserting a resistor shunted by an electrolytic capacitor in the negative lead. The 2Volt supply is provided by the full wave rectifier and one of several 2N3055 regulated supplies that I have had lying about for many years. The box was designed to act as a plinth for the radio and was stained and given a coat of "Briwax" so that it more or less matched the colouring of the cabinet.

Wooden plinth housing the power supply

 

If you know anything of this set or have any suggestions please let me know.

Update 19 Jan 03

 I have now brought the set in from the workshop and set it up with my Ormond moving iron speaker(see this page) and an indoor aerial strung along the picture rail and received several European stations. Of course it worked much better with the external aerial strung from my workshop to the roof of the house.

There was a terrible hum when I placed set on my power supply plinth, I have now relocated the transformer and incoming power connector and switch at the right hand side of the box (not now as shown in the picture above), this has reduced though not eliminated the annoying 50 Hz hum listen The other thing I have realised is that the valve being used as a detector (Mullard PM2A) is really an amplifier triode (too high inter electrode capacity?), this will explain the difficulty in setting the reaction. I have a feeling that the detector valve should have been a PM1HF or something similar. Do you know?

The licence plate

From 1922 receivers manufactured in the UK were required to carry a distinctive label indicating that royalties had been paid and listeners had to buy an annual licence costing 10s (50p) which only permitted the use of receivers made by members of the BBC. Initially half the licence-fee went to the BBC and the rest to the other six members. Receivers would carry two tariffs: one based on the receiver's components, would go to the BBC and the other amounting to 12s 6d (62.5p) on each valve-holder, would go to the Marconi Company as a royalty in return for allowing their patents to be used.

A simple crystal Set of 1923 vintage housed in a polished mahogany case with  lift up lid and ebonite control panel would have cost 5 10s (5.50) of which 7s 6d (37.5p) was a royalty paid to the BBC.

With no valves the crystal set had a considerable price advantage. For example a two valve set of this period might have cost 24, including 1 15s (1.75) royalty paid to the BBC and 1 5s (1.25) royalty paid to the Marconi company.

So what about the history of this set? This is what I have found out so far:

From the information on the history of Beltona Records below I imagine that it was probably made before 1927. These pictures (of a similar but only a 2 valve set) indicate that it may have been made even earlier.

message from Bill Dean-Myatt who is collecting information on Beltona records:

http://www.beltonaproject.co.uk

"Very many thanks for your message about having found a Beltona radio. I had no idea that they had their own brand of radio for sale, however, they certainly had their own brand of gramophones, gramophone needles and various other products.

It doesn't really surprise me to learn your news as Murdoch Trading Company/John G. Murdoch & Co. Ltd owned very many retail shops, some selling records, pianos and allied goods, whilst others were specialist furniture dealers."

Beltona records were produced for the Murdoch Trading company of 59-61 Clerkenwell Road, London, EC1.

record of 1922-1927 vintage with similar trade mark

The Murdochs came from Tibbermore, Perthshire but later some family members [possibly only John G, and his family] moved to Glasgow to work for Collins and later to London. The firm of Murdoch Trading Company was formed (about 1871), and based, in London but John G. Murdoch & Co. Ltd. (the owners of the Beltona trade mark) was registered as a private limited company in 1886 and as a public limited company in 1927. Apart from selling records and gramophones they had always dealt in the sale of pianos and other musical instruments through mail order and various retails outlets.

Thanks to Colin Smythe (23/04/05) for the following biographical details and for his corrections to the previous paragraph.

Early in life he was apprenticed to block cutting for printing on cotton, but block printing having been supplanted by machine printing immediately after the end of his apprenticeship, he preferred not to be tied to a decaying trade and signed articles for a second apprenticeship to the new process. As an apprenticeship in those days was invariably for seven years, he was about 27 years old [in 1857] before his apprenticeship days were over, although he had begun at the age of 13. After being engaged for several years as a machine printer he began to long for a wider field for his energies, and although his employers were reluctant to part with him, and promised him rapid promotion if he would remain, he relinquished the cotton printing and connected himself with the firm of Messrs. Collins & Co. , of Glasgow, who were developing business rapidly as publishers of Family Bibles and similar works. He established successful agencies for their publications in Glasgow, Liverpool, Manchester, and other towns in the North of England. In 1871 he came to London and began publishing on his own account, his principal business continuing to be in Family Bibles, of which he issued editions in Welsh and Dutch, as well as English. At that time the Family Bible was more popular than it is today, and Mr Murdoch's annual output for a number of years was more than 30,000, which were supplied to all parts of the Empire.

The first Beltona records appeared just after the first world war and were made by Crystalate. It was 1922 before the label was revived with the familiar design (see picture) though initially the colours were red and buff rather than turquoise and light turquoise.

In 1927, the label design changed to a black and white design and soon after this, Edison Bell started providing the masters. In 1937 thereabouts the label was bought by Decca Records. The label concentrated on Scottish and Irish music for the rest of its life and ceased to exist in the late 1950s.

Update 1 Apr 03

Colin Smythe, a great grandson of John G.Murdoch, is gathering information about Murdoch and connected companies, particularly the company's history and publications of that last three decades of the 19th century, but also music publishing, The Maidstone Violin and the Maidstone Movement, as well as other activities - print publishing, musical instrument making, phoneons, sewing machines. He would be delighted to hear from anyone with information about the group, at cs@colinsmythe.co.uk

I have found details of another Beltona Radio which came up for auction in August 2006:

BELTONA CONSOLE RADIO

Case: Blackwood veneer, original bakelite knobs.

Dial: Original Painted.

Movement: Valve radio, fully restored & guaranteed.

Manufacturer: Beltona

Approx year: Circa 1930

Approx height: 930mm

Approx width: 750 mm