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Old 18th Jun 2018, 7:17 pm   #1
Doris The Diode
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Default Burne-Jones circuit required

Dear all,

I have recently aquired a Burne Jones radio LW & MW and I’m having trouble finding any information on any BJ radio.

There is no model number just the address on a label with NOP 0495.

Looking at the valve line up it resembles somthing like a Bush DAC 90 with UCH42, UF41, UBC41, UL41 & UY41.

Could someone kindly point me in the right direction.

Cheers,
DD
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Old 18th Jun 2018, 8:43 pm   #2
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Default Re: Burne-Jones circuit required

Does it have Braille markings?
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Old 18th Jun 2018, 8:44 pm   #3
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Default Re: Burne-Jones circuit required

The only reference about Burne Jones is on Wikipedia titled: "British Wireless For The Blind Fund" and then it's only one line:

"Following the appeal, the first 100 crystal radio sets made by Burne-Jones & Co Ltd were issued to blind people at a cost of 31/6d per set. Headphones cost 7/3d a pair".
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Old 18th Jun 2018, 9:00 pm   #4
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Default Re: Burne-Jones circuit required

Graham,

There is no braille.

I’m slowly drawing out the circuit diagram.

The UL41 looks burned inside, which does not surprise me as these usually go.
The rectifier on one side is warped so these two valves I’ll just replace.

I’ll test the audio amp and rectifier first and isolate them from the rest of the radio and put a signal in and see what happens.

I still can’t find a diagram online.

DD
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Old 18th Jun 2018, 9:01 pm   #5
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Default Re: Burne-Jones circuit required

Radiomuseum list 16 models made by Burne Jones but only one is a post war set and that one doesn't fit your description of a 5-valver. There is a picture of this set on page 176 of Radio! Radio! and the design looks more like a mid-thirties set than a post WW2 one.
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Old 18th Jun 2018, 10:02 pm   #6
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Default Re: Burne-Jones circuit required

I would think about grid coupling capacitor first, all UL41s look burnt after a few years but most still work.
I've not seen a UY41 with a warped anode, they are very robust.
Its a common valve line up, is there any unusual features in this set?
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Old 18th Jun 2018, 11:08 pm   #7
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Default Re: Burne-Jones circuit required

Just had a look at the radiomusem and my one is not there, perhaps I have one of the latest models as the valve line up is typical of 1950 radios.

I’ve started to draw the circuit diagram and have started with the rectifier and audio amp.
Once I’ve replaced the canned 2 x 32uF cap and all coupling caps, I’ll test the audio amp and then draw out the demodulator and then connect that up and inject 455KHz signal and test that.

Once I draw out the IF stages I’ll have to do an IF sweep to see which IF freq Burne Jones has chosen.

I’ll put some photos up too and once the diagram is done I’ll put it here too just incase someone else has one of these.

Thanks for your replies.

DD

Either way I’ll report back so please don’t close this thread early.
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Old 18th Jun 2018, 11:26 pm   #8
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Default Re: Burne-Jones circuit required

Some photos would be good too. It may have been "badge engineered" and someone might recognise it.
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Old 19th Jun 2018, 8:56 am   #9
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Default Re: Burne-Jones circuit required

In this period the IF will typically be 465 or 470 kc/s AM and 10.7 Mc/s FM
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Old 19th Jun 2018, 12:39 pm   #10
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Default Re: Burne-Jones circuit required

Here are a few photos and partly draw circuit. I will continue drawing it out later today.

I will consider the IF freq mentioned, thank you.

DD
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Old 19th Jun 2018, 5:24 pm   #11
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Default Re: Burne-Jones circuit required

I have some numbers on the speaker '1252' which could be the date of manufacture Dec 1952.
The date would tie up with the valve alignment if indeed this was a date.

Here is the full diagram, the Osc.coil is in a can and has 4 wires coming out, so the diagram does not depict the correct winding direction or number of turns, it is just a coil as well as the loop antenna, it's just an illustration as opposed to a correct winding diagram.

The volume control is 500K and is the ON/OFF switch too.

If I get really stuck I'll have a look in the can as well as redraw the loop antenna.

DD
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Old 20th Jun 2018, 2:04 am   #12
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Default Re: Burne-Jones circuit required

Tactile marks on at least one knob. Not a lot of use, but indicative of it being a BWBF set.
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Old 20th Jun 2018, 1:21 pm   #13
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Default Re: Burne-Jones circuit required

A slight mistake on the heater voltage on the UF41, it should be 12.6V.

I found a signature and perhaps a date - 53, perhaps the technician’s initials and date of test.

Photo attached.

The dial cord was broken and in great frustration I managed to replace it, very fidley job, took me some time :-(

DD
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Old 21st Jun 2018, 9:52 am   #14
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Default Re: Burne-Jones circuit required

Photo attached.

DD
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Old 3rd Jul 2018, 1:16 pm   #15
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Default Re: Burne-Jones circuit required

Radio is now up and running.

Rectifier and audio o/p valves were u/s.

Coupling & smoothing caps replaced and three off value resistors replaced.
A key resistor which I replaced was the resistor after the rectifier. The low ohmage just did not sit with me right so I put in a 250 ohm resistor in just like most radios of this type have.

IF stages needed a big tweak, less so on the osc and antenna side.

Thanks to everyone for your help.

DD
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