|
Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only. |
|
Thread Tools |
22nd Oct 2017, 3:51 pm | #1 |
Hexode
Join Date: Oct 2016
Location: Darlington, County Durham, UK.
Posts: 343
|
“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 |
22nd Oct 2017, 3:55 pm | #2 |
Moderator
Join Date: Jun 2003
Location: Oxford, UK
Posts: 27,783
|
Re: “Failure of resolve” Miracle model 30 bought
Have you tried https://www.doctsf.com?
|
22nd Oct 2017, 4:22 pm | #3 |
Hexode
Join Date: Oct 2016
Location: Darlington, County Durham, UK.
Posts: 343
|
Re: “Failure of resolve” Miracle model 30 bought
Yes, I have tried doctsf, similar sets but none with three valve layout
Philip |
22nd Oct 2017, 4:28 pm | #4 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
|
Re: “Failure of resolve” Miracle model 30 bought
624 valve....Correct?
Lawrence. |
22nd Oct 2017, 4:52 pm | #5 |
Hexode
Join Date: Oct 2016
Location: Darlington, County Durham, UK.
Posts: 343
|
Re: “Failure of resolve” Miracle model 30 bought
I wondered that,but I may have taken notice of the wrong markings on the valve
Pictures attached |
22nd Oct 2017, 4:59 pm | #6 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
|
Re: “Failure of resolve” Miracle model 30 bought
I've not seen one of those before.
Lawrence. |
22nd Oct 2017, 5:22 pm | #7 |
Dekatron
Join Date: Apr 2005
Location: Bewdley, Worcestershire, UK.
Posts: 4,735
|
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.
__________________
Phil Optimist [n]: One who is not in possession of the full facts |
22nd Oct 2017, 5:40 pm | #8 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
|
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. Last edited by ms660; 22nd Oct 2017 at 5:45 pm. |
22nd Oct 2017, 6:17 pm | #9 |
Banned
Join Date: Dec 2013
Location: Middlewich, Cheshire, UK. & Winter in the Philippines.
Posts: 3,897
|
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. |
22nd Oct 2017, 6:48 pm | #10 |
Heptode
Join Date: Apr 2016
Location: Cheltenham, Gloucestershire, UK.
Posts: 872
|
Re: “Failure of resolve” Miracle model 30 bought
I wouldn't over-cook it with an 80 rectifier .... 10-16uf should suffice ....
__________________
Red to red, black to black. Throw the switch and stand well back! |
22nd Oct 2017, 6:58 pm | #11 |
Banned
Join Date: Dec 2013
Location: Middlewich, Cheshire, UK. & Winter in the Philippines.
Posts: 3,897
|
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. |
22nd Oct 2017, 8:29 pm | #12 |
Dekatron
Join Date: Jan 2004
Location: Newcastle upon Tyne, Tyne & Wear, UK.
Posts: 8,171
|
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.
Ed |
22nd Oct 2017, 10:00 pm | #13 |
Dekatron
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 16,526
|
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.
__________________
....__________ ....|____||__|__\_____ .=.| _---\__|__|_---_|. .........O..Chris....O |
23rd Oct 2017, 10:39 am | #14 |
Hexode
Join Date: Oct 2016
Location: Darlington, County Durham, UK.
Posts: 343
|
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 |
23rd Oct 2017, 11:58 am | #15 | |
Dekatron
Join Date: Feb 2007
Location: Leominster, Herefordshire, UK.
Posts: 16,526
|
Re: “Failure of resolve” Miracle model 30 bought
Quote:
__________________
....__________ ....|____||__|__\_____ .=.| _---\__|__|_---_|. .........O..Chris....O |
|
23rd Oct 2017, 12:34 pm | #16 |
Banned
Join Date: Dec 2013
Location: Middlewich, Cheshire, UK. & Winter in the Philippines.
Posts: 3,897
|
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.
|
23rd Oct 2017, 12:42 pm | #17 |
Dekatron
Join Date: Mar 2008
Location: St. Frajou, l'Isle en Dodon, Haute Garonne, France.(Previously: Ellesmere Port, Cheshire, UK.)
Posts: 3,177
|
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.
__________________
"Hello?, Yes, I'm on the train, I might lose the signal soon as we're just going into a tunn..." |
23rd Oct 2017, 1:06 pm | #18 |
Dekatron
Join Date: Sep 2005
Location: Seaford, East Sussex, UK.
Posts: 5,997
|
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. |
23rd Oct 2017, 1:10 pm | #19 |
Banned
Join Date: Dec 2013
Location: Middlewich, Cheshire, UK. & Winter in the Philippines.
Posts: 3,897
|
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. |
23rd Oct 2017, 1:52 pm | #20 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
|
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. |