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Old 22nd Oct 2017, 3:51 pm   #1
Wishiknewmore
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Default “Failure of resolve” Miracle model 30 bought

Hello, another impulsive buy!

I have just bought another project to add to the lengthening list. As previously, this one is French:
• Miracle – Model 30 – as per chassis plate
• Radiomuseum indicates Le Petit Miracle 203
• Values – 80, 47 and 624
• Condition – complete except for back panel, tatty, dial very worn and veneer broken off and missing
My immediate questions are:
• Any ideas for a circuit diagram?
• What I am assuming are the smoothing capacitors do not have values that I can see, and one has decided to expel some of its contents – suggestions to finding out values?
• On the assumption I will eventually get around to tackling this one, are there any suggestions how to sort the dial:
* It has lost most of its numbers
* It is warped so the ‘pointer’ would come into contact with it and scratch it
* It seems to be made of a translucent plastic
Or is this one a lost cause?

Too many in the work in progress to do this one yet but I like to get an idea of prognosis

Many thanks
Philip
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Old 22nd Oct 2017, 3:55 pm   #2
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Default Re: “Failure of resolve” Miracle model 30 bought

Have you tried https://www.doctsf.com?
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Old 22nd Oct 2017, 4:22 pm   #3
Wishiknewmore
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Default Re: “Failure of resolve” Miracle model 30 bought

Yes, I have tried doctsf, similar sets but none with three valve layout
Philip
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Old 22nd Oct 2017, 4:28 pm   #4
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Default Re: “Failure of resolve” Miracle model 30 bought

624 valve....Correct?

Lawrence.
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Old 22nd Oct 2017, 4:52 pm   #5
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Default Re: “Failure of resolve” Miracle model 30 bought

I wondered that,but I may have taken notice of the wrong markings on the valve
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Old 22nd Oct 2017, 4:59 pm   #6
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Default Re: “Failure of resolve” Miracle model 30 bought

I've not seen one of those before.

Lawrence.
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Old 22nd Oct 2017, 5:22 pm   #7
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Default Re: “Failure of resolve” Miracle model 30 bought

What's its base? Valve type 41 is a high-gain output pentode. The circuit can't be too complicated (just one RF/detector plus an output valve - the 80 is a rectifier) so you may end up having to trace it out.

It's an intriguing set which will look beautiful once restored.
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Old 22nd Oct 2017, 5:40 pm   #8
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Default Re: “Failure of resolve” Miracle model 30 bought

It might be a version of the Mazda EY624, the equivalent for that is the 24 valve:

https://www.radiomuseum.org/tubes/tube_ey624.html

Which by coincidence is one of the three valves mentioned in this thread (the 24 valve):

http://retro-forum.com/viewtopic.php?f=2&t=238015

Lawrence.

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Old 22nd Oct 2017, 6:17 pm   #9
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Default Re: “Failure of resolve” Miracle model 30 bought

With an 80 rectifier, maximum reservoir is 32uf, smoother could be the same, not critical.
It probably had about 16uf and 32uf respectively.

Dial could be remade in acrylic sheet, markings copied from something the same shape.
A job for MS Paint and printing on water slide film.
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Old 22nd Oct 2017, 6:48 pm   #10
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Default Re: “Failure of resolve” Miracle model 30 bought

I wouldn't over-cook it with an 80 rectifier .... 10-16uf should suffice ....
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Old 22nd Oct 2017, 6:58 pm   #11
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Default Re: “Failure of resolve” Miracle model 30 bought

Yes, I did suggest 16uf.
It depends how old this set is, electrolytics were smaller in earlier years because they were expensive.
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Old 22nd Oct 2017, 8:29 pm   #12
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Default Re: “Failure of resolve” Miracle model 30 bought

Hi Philip, typical of French/ Belgian sets of the period. I take it most of the valves are UX based. Note that some of the coupling caps may be marked in cm, which I think equates to 1000pF.

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Old 22nd Oct 2017, 10:00 pm   #13
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Default Re: “Failure of resolve” Miracle model 30 bought

1cm = 1.11pF, as near as. Unless it's tuning something thinking in pF direct is near enough.
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Old 23rd Oct 2017, 10:39 am   #14
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Default Re: “Failure of resolve” Miracle model 30 bought

Thank you all for you prompt and helpful responses


After some careful cleaning, bright light and proper spectacles I have found (I think) the values on the smoothing caps – 8uF 500v

The valve bases are (to the best of my knowledge):
UX4 for the 80 and UX5 for the 624 and 47

The coupling caps are indeed marked in cm’s, thanks for info and advice

Thanks for the ‘retro-forum.com’ link – the circuit diagram looks positive and a good base to compare with my set

I will need to research the whole ‘water slide film’ thing – any appropriate reading would be appreciated

The ‘back panel’ – I can’t see any fixings for a back panel, is it possible it didn’t originally have one?

Many thanks,
Philip
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Old 23rd Oct 2017, 11:58 am   #15
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Default Re: “Failure of resolve” Miracle model 30 bought

Quote:
The ‘back panel’ – I can’t see any fixings for a back panel, is it possible it didn’t originally have one?
Quite possible- particularly if it's a 110-120V supply set.
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Old 23rd Oct 2017, 12:34 pm   #16
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Default Re: “Failure of resolve” Miracle model 30 bought

If you put "water slide" into the search box at the top of this page, you will find many threads on the subject.
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Old 23rd Oct 2017, 12:42 pm   #17
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Smile Re: “Failure of resolve” Miracle model 30 bought

Hi,
Quite a few French sets didn't have back covers. I have a Reela table radiogram sans cover. It took me ages to search for non existant screw holes!
Cheers, Pete.
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Old 23rd Oct 2017, 1:06 pm   #18
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Default Re: “Failure of resolve” Miracle model 30 bought

The 624 is 2.5V heater.
The 47 is a 2.5V heater.
The 80 is a 5V heater - hopefully it is on a separate winding.
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Old 23rd Oct 2017, 1:10 pm   #19
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Default Re: “Failure of resolve” Miracle model 30 bought

Common to have no back on French and indeed other continental radios. And of course many early battery sets.
I think Schneider sets always have backs though.

David G4EBT has had considerable experience with water slide, I'm sure he would advise you if you PM him.
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Old 23rd Oct 2017, 1:52 pm   #20
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Default Re: “Failure of resolve” Miracle model 30 bought

So far as I can make out from the photo's the heater winding for the rectifier is centre tapped for the HT take off.

Lawrence.
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