tbfan

Okay, calibration requires instrumentation that Nagra III does not have on board. If they have the instruments, nothing stands in the way of the project. I remembered one thing that I forgot. On mine, the heads were so worn that they had the effect you describe. (If you press your finger against the tape during playback, the sound will improve if you lap the heads). After I have refurbished the sound heads, the level differences were completely gone and the sound was crystal clear again. This procedure for reconditioning is called "Läppen". As for the strobe, have you read the instructions? There are the general conditions under which the stroboscope works. In short: Use a real light bulb and no LEDs. It is better to check the speed with a measuring tape, everything else is inaccurate. Pressure roller (if you meant the part), a new one cost 80EUR on Ebay. Finally, do everything on your tape recorder that you feel comfortable with, but no more. If you want to do everything yourself, get a locking ring pliers and spring carriage (tape tension). If not, the offer sounds good and fair.

Well, they have a schematic and block diagram to help them find errors, but I have to say that Kudelski was very picky about what they used to build Nagra. We are not talking about an Uher Report or a Revox, Telefunken Studer... Normally I always change electrolytic capacitors, but Nagra has electrolytic capacitors that were really only found in military applications. I know also no Nagra which quit the service because of broken Elkos. If you have a component tester, unsolder the suspected electrolytic capacitors, test them and replace them if they are defective, but I don't think that the electrolytic capacitors are the problem. My Nagra shows a similar behavior as theirs, probably not quite so extreme but still. This is because a tape machine must be calibrated to a specific tape, then the level is correct again. The procedure is explained in the German manual, although not as detailed as one would need it. Try (if you have) different tapes (sometimes one tape is no longer good). I have found that mine has problems with Agfa tape, BASF seems to suit her (especially DP26), Pyral/RMG/RTM LPR35 she also likes to. Try to find out where your Nagra came from, most of the time you can find out what kind of tape the previous owner calibrated the machine to. Mine came from Radio Bremen or NDR, which means the machine was most likely tuned to BASF DP26.

Good that I could help them. It is not normal to short-circuit the Nagra. Read the instructions and test it.

Ok this is going to be a little more difficult. I think someone has changed something on their Nagra. I guess judging by their location they should be able to speak perfect English and (if they haven't done so, have a look at the user manual) (https://www.nagraaudio.com/product/nagra-iii/ scroll down to downloads ) First the belts: The Nagra has 3 round (!) belts: 2x 90mm x 2.5mm or 3mm 1x 64-66mm x2,5mm I can't explain the exchange exactly, but if you have some time I will make a video about how to exchange all three belts without having to readjust everything afterwards. On page 15 (Electrostatic discharge) is something about a small brush ... Read this passage and compare it with your Nagra. You can find this brush on the Honywell switch for the fast rewind (this little red box, on the take-up reel) https://museumofmagneticsoundrecording.org/images/R2R/NagraIIIManual.pdf Page 27 block diagramm. On the bottom of the page is the wiring of the Tuchelbuche as it should be. (To the left of the playback head) Contact 2+4 would be: Ground (2) and motor stop (4)

Hello, I'm new here and to be honest I don't know exactly where my topic belongs. I have had a Nagra III for 3 years (was my dream to have one). Now a week ago the belts started to give problems and I ordered new ones which will arrive next week. At the same time another error has crept in that I just can't find. When I record via microphone, the recording is crystal clear, but when I record via the two line inputs, the recording is simply muffled. Well, let's make it short: I'm looking for a service manual that says how to tune the Nagra (to a specific band for example LPR35 or LPR90). And a manual that says how to get the resistance and capacitor values to calibrate the Nagra. Nagra Audio provides the manuals (one is the user manual and the other is the service manual (it says how to calibrate but no values and the position of the parts is not really explained). https://www.nagraaudio.com/product/nagra-iii/ scroll down to downloads

The easiest way is to buy a screwdriver bit set with slotted screws that fit exactly into the screws. This is how I was able to loosen the extremely tight screws of my Nagra III. Important! If you loosen the bottle screws, you may have to readjust the tape tension. My procedure for my Nagra III was as follows: Remove the power supply and/or batteries and switch the Nagra on to discharge the remaining current. (Then switch off again). When removing the motor, make sure that they do not touch the tachometer head, otherwise, as far as I know, there is not really much more to consider.

Compare the picture in the service manual on page 2 with your Nagra. Consider "Operating Instructions German". So you can endure you mistakes. On the other pages there is something about the engine and the traction forces that must have tape and how to set them. Quickly everything in German, but written very sparingly. On the last pages there is again something in English. https://www.nagraaudio.com/wp-content/uploads/2020/09/Bedienungsanleitung-Nagra-III-Deutsch.pdf https://www.nagraaudio.com/product/nagra-iii/ Let's tell it like it is, my English sucks, but I hope you understand what I'm trying to say. As you fault whether the fault at the battery power rights. If not, then look in the power supply area (for example, in the area of the "small cloth socket"). If the error is in the power supply, read the manual (the engine is used in both English and German versions, and the troubleshooting procedure is solved). The block diagram can also help to locate the error. If that doesn't help, I'll take photos of my Nagra III and upload them here and compare the cables as best I can with yours. If it is a fault in the electronics, ask in this forum. Tape technology is a German invention, they will also find many experiences here. Many speak English, certainly better than I do and can help you there. https://tonbandforum.de/