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About dela

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    I have been working with film post production for 12 years; I am now primarily working with TV (on a danish national broadcaster, as well as being involved i film projects. I am quite fascinated by Nagra recorders and everything connected with them.
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  1. And I know where one of the other MX´s are... Fortunately I am sure that all the test users knew that it was well worth keeping it, so they are probably out there still... I am not sure when it was released, but I guess that it was about 2006-2008 (the EMP came in 2011). But the design is a bit similar to the Stelladat, which was a bit earlier, but with the same top plate with controls, covered by a lid.
  2. Only 10 Nagra MX mixers were made, and they were apparently made as evaluation samples. It was a small 4 channel (2 Mic + 2 line) mixer, and it was made to the same quality standards as all other Kudelski products. The problem was that it was a bit hard to figure out what to use it for: It was a 4 ch. mixer but only 2 mic. inputs, making it effectively a 2 ch. mixer, since you hade very few line sources on a set. If you should have line sources, they couldn't be controlled from the front, since there was only two controls, controlling the mic. input gain. All other settings and adjustments wer
  3. I know the feeling; apart from that I got mine for a very reasonable price, I had the same problem. The SP7 electronic design is actually quite simple, and there are ways of quickly locating the problem, but it require som knowledge about electronics. If you want it, I can try to help you along, but if you are not familiar with electronics, I would advise you to find a person to help you. He/she doesn´t need to be an expert, but it would be very helpful, if I could make suggestions for measurements and you (or your helper) can answer back about the results... First a comment about the bel
  4. Once in a while Stellavox is mentioned as a rival to the Nagra, and I still remember browsing through "HiFi Revyen", a danish HiFi yearbook listing all the available/distributed products and dreaming of one day getting a Stellavox... Since then a lot has happened, but in this context the most important probably was that I became interested in Nagras in stead, and Stellavox took a second seat. But still the comparisons between the two brands made me curious, and late last year I got tempted by a Stellavox SP7 in a dubious state, but for a good price, and I couldn't´t resist it. If nothing else,
  5. With the risk of replying to a spam posting: The 3 screws are grub screws, and the threading is in the stabilizer roll itself. They press against 2 sintered bearings inside the roller, so if you loosen the screws, you can pull the roller exterior off and clean/lubricate. when the roller is reinstalled, remember to check that there is ca. 0.5mm clearing over the top plate, so it can move freely when it is disengaged.
  6. On the ATN supplies the ripple capacitor is often completely dried out. It can easily be replaced by a new capacitor (1000-2200 uF, suitable voltage), making the supply as good as new. And without hum.
  7. Did you find out more about the LEDs that are permanently on? I have the service manual in case you need it...
  8. I still would advise you to get the proper type of oil; PDP65 oil will last longer and lubricate better...
  9. The roller is held in place by three tiny slot drive (flat) screws. If you loosen them, you can pull off the roller. There are two sintered bearings inside, that are staying in place on the shaft. It shouldn´t be a problem to massage/lubricate the two bearings, as they are readily accessible when the roller cap is off. I would recommend using PDP65 oil; it is a bit expensive, but since you will only need 1-2 drops, you can buy f.ex. 3 ml oil. That will last a long time. https://www.ebay.com/itm/6-5-ml-Sinterlagerol-Gleitlagerol-ISOFLEX-PDP65-fur-Schallplattenspieler/123
  10. It is a bit of an oddity, because in itself it is nice and well built, but since Kudelskis accessories (and the Nagra) had positive ground, it could only supply -10 V to other units. That limits the use, since there were virtually no other manufactúrer, who used that configuration, so it is primarily useable for powering their little mixer and, possibly, the QGB adapter. The cables in the back are the same as the ones used for the QGB, and they might be used with the SELA BT2880 mixer too (I am not sure).
  11. I think that the nominal life time of the head assembly is 1500 hours, but I guess that it also depends on the general care for the heads and drum. One of the problems with having a defective Nagra D is that virtually nobody can service them. They are not only quite advanced, but the repair also mostly involve very specialised tools. F.ex. to measure the RF output voltage on the Nagra D, you will need to mount two special clamps on the entry tape guides on the drum assembly. But since there is no picture or description of these tools, it is impossible to find out anything about their function.
  12. The german seller also has a Nagra D in "mint condition" and "almost unused" drum. This almost unused drum has run for 750 hours, which is half the nominal life time. So much for "mint"...
  13. If you check the list, right now many of the ads are from the same German seller, and his prices are certainly not discounted. If his prices were realistic, I would be a very, very rich man... Unfortunately/fortunately they are not, and it seems that eBay is increasingly flooded with Nagra gathering dust there; unsellable due to the unrealistic prices. I would love to see the German sellers collection though; I guess that he doesn't sell much, but he sure has some interesting machines.
  14. Sue Butcher: Regarding the colours of the Nagra III leads I have just checked on a set of schematics for the III, and it seems that the head with the black/blue leads are the "original" recording head. My drawing is from 1957, so I guess that it must be the first type/proto type combination. There is no indication that the head is polarized per se, but it might be that an overzealous engineer had felt that the phasing of the head could be important. On the photo of the eBay heads there also is a (white) head with red/red wires; that seems to be a playback head, but again with identical coloure
  15. I hope that they are not trying to record anything on the second shot... The tape is threaded wrong, making the tape pass the erase head without contact...
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