1930s Juwel 25

Discussion in 'Juwel No:25' started by Trojandog, Sep 13, 2014.

  1. Trojandog

    Trojandog United Kingdom Subscriber

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    As much as I would like to relate a story of finding this stove under a pile of junk at a car boot sale after hours of searching, that wasn't the case. I just happened to be lucky enough to be browsing Ebay only a couple of minutes after the seller listed this on a Buy-it-Now for £28.00

    In the 1930s, Gustav Barthel made the Juwel 22 and the Juwel 25. The only difference appears to be that the 22 has a regulator whereas the 25 does not. Logically, and bearing in mind that in other stoves such as the Primus 70/71, the unregulated versions preceded the regulated versions, it would be reasonable to suggest that the unregulated 25 preceded the regulated 22. However, others have said that it is the reverse. To add more confusion, the case for the 25 has the hole in it for a regulator key, implying that the 22 was already in production and they used the same case for both versions.

    As received:

    1410642853-Juwel01.jpg 1410642862-Juwel02.jpg 1410642873-Juwel03.jpg 1410642886-juwel04.jpg

    The stove stripped down:

    1410642925-Juwel05.jpg

    The pot stand is in four sections:

    1410642955-Juwel06.jpg

    Two of the sections slot into holders with the other end hooked onto the side of the case:

    1410642973-Juwel07.jpg 1410642981-Juwel08.jpg 1410642992-Juwel09.jpg

    The cross pieces are then hooked on. They can be positioned for large or small pots:

    1410643004-Juwel10.jpg 1410643014-Juwel11.jpg

    In transit mode, the travel cap is fitted over the jet/nipple:

    1410643025-Juwel12.jpg 1410643050-Juwel14.jpg

    In use the cap is removed and the burner bell fitted:

    1410643062-Juwel15.jpg

    Despite having a standard size small jet, the bell has quite a wide thread. Here shown on the left with a bell from a Primus 71 on the right:

    1410643074-Juwel16.jpg

    The spirit cup is bolted on from underneath:

    1410643037-Juwel13.jpg

    The top of the tank has a pattern of dotted marks. It looks some sort of tape has been stuck there, possibly a sticking plaster. The dots have eaten into the brass and cannot be polished out:

    1410643111-Juwel17.jpg 1410643125-Juwel18.jpg 1410643137-Juwel19.jpg

    End of part 1.
     
    Last edited by a moderator: Jun 27, 2015
  2. Trojandog

    Trojandog United Kingdom Subscriber

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    Part 2.

    On the side of the tank is an SRV:

    1410643902-Juwel20.jpg 1410643917-Juwel21.jpg

    The surface it mates against is flat. There is no raised ridge around the hole. From the hole a pipe can be seen (not visible in the image) curving upwards towards the top of the tank:

    1410643928-Juwel22.jpg

    I replaced the cork pip with one of viton. Due to the flat mating surface, the pip must sit proud of the holder. Note the rings cut into the end of the rod to allow it to be gripped:

    1410643940-Juwel23.jpg

    On the left side of the SRV stub is a small vent hole:

    1410643954-Juwel24.jpg

    The SRV doubles as a flame adjuster and stove extinguisher. In the instructions that I posted here - Link paragraphs 5, 6 and 7 on page 2 state (apologies for accuracy of translation):

    5. Turning down the flame. This is done by pulling the grooved pin of the safety valve.

    6. Extinguishing. Pull on the grooved pin of the safety valve until the only a flame remains in the interior of the burner head. Now blow the flame out. Then immediately half open the filler cap and leave it open.

    7. Packing. Remove cooking rack, unscrew the burner head and fit the travel cap. Now tighten the filler cap.


    The wick was replaced with some cotton mop string. Connection to the tank is via a tapered thread:

    1410643969-Juwel25.jpg 1410643979-Juwel26.jpg

    The hole for the control key when the case is used with a Juwel 22:

    1410643989-Juwel27.jpg

    The stove also came with a folding pricker and spanner:

    1410644016-Juwel28.jpg 1410644026-Juwel29.jpg

    After a clean up and replacing all seals:

    1410644037-Juwel30.jpg 1410644047-Juwel31.jpg

    Reading for filling with Panel Wipe using the funnel kindly given to me by Mac at CASG8 in May:

    1410644059-Juwel32.jpg

    First firing was OK but a little lacking in power. After 10 minutes the tank was barely warm:

    1410644068-Juwel33.jpg

    Gave the jet a good re-clean and it ran a little better:

    1410644079-Juwel34.jpg

    However, like most stoves with an off-set tank, it ran sweet as a nut once a pot of water was put on top:

    1410644089-Juwel35.jpg

    All in all cracking little stove. I like the innovation of the adjustable pot rest and flame control via the SRV, but wonder why they didn't make the lid of the case usable as a cooking pot?

    Best wishes,
    Terry
     
    Last edited by a moderator: Jul 2, 2015
  3. presscall

    presscall United Kingdom SotM Winner SotY Winner Subscriber

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    I think you unearthed instructions for this stove a couple of days ago Terry?

    John
     
  4. presscall

    presscall United Kingdom SotM Winner SotY Winner Subscriber

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    Yes, found them HERE
     
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  5. kerry460

    kerry460 Australia R.I.P.

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    G,,day . definitely an interesting little stove .
    as you have said it does have some nice features and I also wonder why the top wasn't made as a pot .
    I like it , thanks for showing it :thumbup: :)

    cheers,
    kerry
     
  6. Dutch_Peter

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    :thumbup: Nice! It shows that there's no need to spend a fortune, but to have patience and luck 8)
     
  7. 1966dave

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    Stunning!



    Now I want one of those too.......



    ....oh dear.
     
  8. geeves

    geeves New Zealand Subscriber

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    Turning down the flame. This is done by pulling the grooved pin of the safety valve.

    Do I understand this right?
    You grab the pin in the centre of the srv pull it so vapour is all round your fingers so the flame reduces. That would save the need for shaving your hands from time to time
     
  9. anlrolfe

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    :mrgreen: Wow!!

    What a wonderful specimen.

    Thanks for sharing,

    AR
     
  10. shagratork

    shagratork United Kingdom Moderator, R.I.P. Subscriber

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    Great acquisition Terry.
    Well photographed and described for the Gallery.

    There are many positives for this stove. The one I like is the pan trivet - very nifty!
     
  11. mr optimus

    mr optimus Subscriber

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    Excellent score Terry, the price you paid was a bargain.

    If the seller had put in auction I am sure it would have reached more well done there
     
  12. presscall

    presscall United Kingdom SotM Winner SotY Winner Subscriber

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    I suppose with the SRV some way off from the burner and separated by the windshield/box that method of control should be possible without igniting the released vapour ... Terry's still here to tell the tale.

    It's certainly a handy way to drop tank pressure and control a burner rapidly, from recent experience with my Taylor's paraffin stove

    1410706655-28.JPG 1410706673-29.JPG

    John
     
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  13. Trojandog

    Trojandog United Kingdom Subscriber

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    Control via the SRV doesn't seem to be an issue. I vented it and then let the pressure build again half a dozen times today with no issues. With a small tank there isn't much vapour and it vents away from the burner. It would be pretty dissipated by the time any reached the flame.

    Barthel was a big player in the German stove market so I imagine that they would have tested it extensively before releasing it commercially.

    Terry
     
  14. Trojandog

    Trojandog United Kingdom Subscriber

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    Just realised another difference between the 25 and the 22 - the 25 is unregulated so needs a travel cap, whereas the 22 has the facility to shut off the fuel flow via it's regulator. The 22 is therefore not supplied with a travel cap.

    Terry
     
  15. nmp

    nmp United Kingdom SotM Winner Subscriber

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    Terry

    When I read the instruction manual a few days ago That was the stove in it that I thought I would love one of those. You lucky beggar!!!!! congrats on a very unusual and attractive stove aty a great price. I scored the tank for one of my 1915 No 96s in the same way ..luck!

    Cheers Nick
     
  16. nmp

    nmp United Kingdom SotM Winner Subscriber

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    Terry I was reading an advertising leaflet that's on sale on Ebay that has the picture of your stove in it its still up for grabs with a buy it now. I have not seen the instructions on here yet.
    Nick
     
  17. tekkster

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    Woohoooooo. What a stunner!
     
  18. snwcmpr

    snwcmpr SotM Winner Subscriber

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    Greatly detailed post. I had find it when I saw the photos of 2015 Newark meet.

    Ken in NC
     
  19. tekkster

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    Wow, quite the stunner. Beautiful.