Durst Fuse cap

TMZ · Jun 29, 2021

Sorry for such a minor yet important issue:

During a recent studio move, the fuse cap off my Durst A707's transformer disappeared along with it's fuse.

Fuses I have spares of but any idea of where I can find another fuse cap?

It has a bayonet fitting and seems to be a standard Durst thing as the ones off another Durst fit perfectly.
I've tried going to a Electronics supply place and they have a more modern fitting (such as those found on my more modern Elinchroms for example), but not the Durst bayonet style.

Been googling for hours and can't seem to ID a replacement.

Any Durst gurus out there?

Thanks!

AgX · Jun 29, 2021

Never saw caps of fuses sockets on sale on their own. Install instead a complete similar fuse holder.

TMZ · Jun 29, 2021

If I could find a similar style one, happy to buy a whole fuse holder and just use the cap, but if no other way, then I'll have to work out some way to pull it out, solder and install a new one.

Is there some spare part out there in an electronics seller that sells a similar complete fuse holder? Is that bayonet style have some sort of name/number for reordering?

Kind of like light bulbs, B22, E14, B15 etc?

or was it proprietary Durst design? I'm no expert on electronics at all, so any help or clarification would be great.

I also run a Multigraph for larger formats and a M605 for small prints and proofs, but the A707 was the main 35mm and 120 workhorse so would be great to get back up and running...

thanks in advance...

AgX · Jun 29, 2021

Keep in mind that electronics supply got more international over the last 40 years. It is much more likely that a european manufacturer back then applied a european product and stuck to it over the manufacture of its product whereas I assume that today something at hand would be chosen as long as it can be mounted without modifying the design.
In the past a electronic parts supplier gave technical sketches for such holder, whereas same supplier states today for such holders "design may vary".

To my understanding the lock design of such glass-tube fuse holders (in contrast to ones for the big porcellain-fuses) was proprietary.

Nicholas Lindan · Jun 29, 2021

Could you (or someone with a fuse cap) post a picture of the missing part?

MattiS · Jun 29, 2021

Check rhe (metric) dimensions of the fuse Durst used - I'd expect a 5x20 glass fuse. Replaci g the whole 5x20 fuse holder should be straight forward and much easier than getting the exact fitting bayonet cap.

CMoore · Jun 30, 2021

TMZ said:
Sorry for such a minor yet important issue:

During a recent studio move, the fuse cap off my Durst A707's transformer disappeared along with it's fuse.

Fuses I have spares of but any idea of where I can find another fuse cap?

It has a bayonet fitting and seems to be a standard Durst thing as the ones off another Durst fit perfectly.
I've tried going to a Electronics supply place and they have a more modern fitting (such as those found on my more modern Elinchroms for example), but not the Durst bayonet style.

Been googling for hours and can't seem to ID a replacement.

Any Durst gurus out there?

Thanks!

Can you post any pictures of it.?

TMZ · Jun 30, 2021

Sorry about the delay, I had to hunt down extension tubes to try to get a macro shot of the fuse cap.

The pictures are of the fuse cap off an AC800 which is exactly the same fitting though it holds a 5 x 32mm fuse rather than a 5 x 20mm that goes into the AC707.
(Yes, was a surprise to me too how dirty it is, years of unattended use!)

ic-racer · Jun 30, 2021

It may be hard to find that exact part. Schurter makes something similar, but would require replacing the entire holder (no big deal really).

ic-racer · Jun 30, 2021

FYI, sometimes the search can take a while but yield great results, so don't give up. For example I was able to find the exact match button replacement for the broken Durst control unit that came with my enlarger. Parts came from Mouser.com. Pretty amazing really, for a controller made in Italy the 1990s!

TMZ · Jun 30, 2021

Thanks for the mouser.com link.

I'll have a look.

I'll also have a go at dismantling the case of the transformer and see about trying change the fuse holder.

Thanks for everyone's input.

mshchem · Jun 30, 2021

It's got to be a standard part.

CMoore · Jun 30, 2021

I have several similar types for guitar amps.
Let me take a look at what i have and i will get back to you tomorrow.

TMZ · Jun 30, 2021

@mshchem

yeah, it must be, right?
Every Durst I've ever used over the last 35 years that had a fuse cap was like that, I seem to remember, so that's why I thought it would be common, but can't seem to track it down.

mind you it's probably been years since they've made a pro enlarger, so it might be a bit obsolete?

Don't know, we always had a little box of fuses in the bits and pieces box in the darkroom, and just changed it when it blew, though that was pretty rare...

just bad luck to lose it during the move

TMZ · Jul 1, 2021

@CM,

thanks!

CMoore · Jul 1, 2021

TMZ said:
Sorry about the delay, I had to hunt down extension tubes to try to get a macro shot of the fuse cap.

The pictures are of the fuse cap off an AC800 which is exactly the same fitting though it holds a 5 x 32mm fuse rather than a 5 x 20mm that goes into the AC707.
(Yes, was a surprise to me too how dirty it is, years of unattended use!)

Judging by your very good pictures, i have 2 that are pretty similar but will not work.
Sort of what i thought.
I am assuming this transformer is a pretty big unit, maybe in a metal box with connections going in an out.?
Push coming to shove ................would it be too difficult to mount an In-Line fuse inside the box, or even on the outside in a Plastic J-Box.?

CMoore · Jul 3, 2021

TMZ said:
Sorry for such a minor yet important issue:

During a recent studio move, the fuse cap off my Durst A707's transformer disappeared along with it's fuse.

Fuses I have spares of but any idea of where I can find another fuse cap?

It has a bayonet fitting and seems to be a standard Durst thing as the ones off another Durst fit perfectly.
I've tried going to a Electronics supply place and they have a more modern fitting (such as those found on my more modern Elinchroms for example), but not the Durst bayonet style.

Been googling for hours and can't seem to ID a replacement.

Any Durst gurus out there?

Thanks!

Is this screwed into a metal or plastic chassis from the inside.?
If so, it is an easy replacement with a new one.
There will be 2 wires to De and then Re solder.

TMZ · Jul 4, 2021

It's screwed into the metal chassis on the inside.

I'm going to take off the cover in the next day or two when i get a chance and have a look from the inside.

I'm not a good solderer, but may have to learn. Years of having a studio tech who used to look after all these things was a real luxury.

In fact, on a side topic, the AC707 used to be very glitchy with all it's old school complicated electronics, so he wired it up to be a "manual" enlarger, in that it just turned on and off.

Best thing ever as it now just works with the colour head to dial in CMY and on and off with an enlarger timer. Been flawless for over 20 years of pretty heavy usage!

CMoore · Jul 4, 2021

TMZ said:
It's screwed into the metal chassis on the inside.

I'm going to take off the cover in the next day or two when i get a chance and have a look from the inside.

I'm not a good solderer, but may have to learn. Years of having a studio tech who used to look after all these things was a real luxury.

In fact, on a side topic, the AC707 used to be very glitchy with all it's old school complicated electronics, so he wired it up to be a "manual" enlarger, in that it just turned on and off.

Best thing ever as it now just works with the colour head to dial in CMY and on and off with an enlarger timer. Been flawless for over 20 years of pretty heavy usage!

Assuming the fuse-holder just has 2x Flying Leads (wires) and is not involved with a printed circuit board in some odd way....................you should be alright. .
There will just be 2 hooks or eyelets that the wire wraps around. Those connections are pretty beefy. Probably 18 AWG wire that is not very fragile and can take some heat.
Watch a Youtube video to remind yourself the basics of soldering and you should be OK.

AgX · Jul 4, 2021

Is it actually screwed into a metal casing?
Most metal casings are from sheet metal and thus too thin to take a thread. Devices then are just plugged in and fixed by a retaining nut.

Hilo · Jul 4, 2021

Assuming you are in the US, you could ask Glenn Evans for advice. He may have the part, or may offer a solution

glenn@glennview.com

AgX · Jul 4, 2021

The solution is obvious. Exchange the holder by a lack of the original version by a similar model.

CMoore · Jul 4, 2021

AgX said:
Is it actually screwed into a metal casing?
Most metal casings are from sheet metal and thus too thin to take a thread. Devices then are just plugged in and fixed by a retaining nut.

Yes, that is most likely it.
There is a big washer that threads onto the fuse holder and tightens against the inside of the chassis.
The more modern stuff often uses angled plastic to create a spring effect,
I am sure his is retained by a big washer.

TMZ · Jul 22, 2021

Just wanted to follow up and let you guys know the conclusion.

I'm following the advice here, but as I'm not so expert at these sort of things (soldering and tinkering with the insides of a 240V transformer) I am getting a "friend" to do it.

A case of beer and a similar sort of fuse holder plug to be provided (cheap so I'm buying 3-4 extra holders just in case this happens again!).

Thanks for all the advice everyone.

And for the record, the Durst AC707 uses a 6mm x 32mm T10A slow blow fuse for the transformer, which is similar to the Durst AC800 but that has 2 fuses, both 6mm x 32mm but one is T12A slow blow(lamp) and the other T2A slow blow(other electronics). The AC707 also has a T0.8A in it's head, most likely for the electronics but my one's been hotwired, so that all no longer works. It just goes on and off, which is what I need it to do. Manual control!

aca · Aug 1, 2021

TMZ said:
Sorry for such a minor yet important issue:

During a recent studio move, the fuse cap off my Durst A707's transformer disappeared along with it's fuse.

Fuses I have spares of but any idea of where I can find another fuse cap?

It has a bayonet fitting and seems to be a standard Durst thing as the ones off another Durst fit perfectly.
I've tried going to a Electronics supply place and they have a more modern fitting (such as those found on my more modern Elinchroms for example), but not the Durst bayonet style.

Been googling for hours and can't seem to ID a replacement.

Any Durst gurus out there?

Thanks!

Hello TMZ,

I am hoping you can help me out. Today all of a sudden our Durst 707 doesn't turn on anymore. I have check the lamp with another enlarger and the lamp is still good.

Now I am hoping for something simple like a burned out fuse. Could you provide me with any pictures where the fuse is located on the transformer/board side, please?

Cheers

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