Telefunken M5 tube

[bitbrain2101]

Hello Vladislav,

sorry, I did not see your posting with the wav-file. I will check that later because I am busy at the moment with other things.

Regards, Tobias

[bitbrain2101]

Hello Vladislav,

I have discussed the problem with an expert, there is no tape slip in your recording !! You can hear a periodical speed variation with the revolution frequency of the Capstan axle. So you have to look at the drive mechanism of the capstan axle for the problem. I can´t help further with this problem, because I don´t know details of the 3-speed motor at the M5.

Regards, Tobias

[Vladislav81]

Hello Tobias and the others,

I've recorded today 3150 Hz on the very same tape.

https://disk.yandex.ru/d/EqtKvOzRInC3tg

In the beginning of this recording the right tension arm oscillated a lot. I myself saw the tape swinging very hard and the right reel holder slowing down at this moment.

I now know that it's not the tape that slips because the right coaster slows down, it's the right coaster that slows down because the tape slips. And that, by removing the brake band at the right side, I'm loosening the feedback loop.

Regards, Vladislav

[Vladislav81]

Hello Tobias and Manfred,

Today I've decided finally put the brake band and the rest that goes with it back to it's place. As I'm not a technician, I've spent almost an hour to do that. The most difficult was to put all the tiny screws and spring back. Works like it used to. Thinking of selling it and ReVox C278 to buy Nagra IV-S.

I think no one needs mono tube recordings today. All magnetic recording enthusiasts need high quality STEREO recordings.

Regards, Vladislav

[Vladislav81]

Hello Tobias and Manfred,

Maybe you're not interested in this theme anymore, but I've discovered for myself what would need 30 ips speed for today. This speed is necessary nowadays, on modern tapes, in order to make recordings with higher levels (up to +12 dB VU), using the possibilities of tube circuitry to the maximum, which gives modern tapes, but avoiding “mush” in the sound, with the soft natural compression given by the tubes and tape. A space of at least 1/4" for each channel is needed on tape to achieve this effect.

This, and only this, combination of the tape speed and recording level (highest possible) gives the most sweet sound out of the tube M5. The sound becomes big, open and lush.

Regards, Vladislav

[Magnettonmanni]

Hello Vladislav,

I was in poor health until a few days ago and I am only slowly getting better.

I've looked at the posts in the meantime and all I can say is that it's hard to understand. You are running in  a circular path.

After removing the brake band, there were in maximum only three faults left: 
the belt (presumably that's what makes the noise), the winding clutch or the winding motor itself.

Then, by simply braking the right belt drive plate by hand, it would be possible to determine that there is a fluctuating drive torque 
and the cause or bad part could also be felt.

At the current state of given knowledge all other possibilities brought into discussion could be excluded.

Your recent considerations about the sound of the music by overloading the tape into saturation have no connection with this device error.
The decision as to record in stereo or mono should actually have been made beforehand.
Converting an M5 to stereo is a job for someone who killed father and mother and is very, very expensive.

Best Rregards
Manfred

[Vladislav81]

Hello Manfred,

Glad to see you again. Best wishes for the good health!

So, what am I to do next? Do I have to remove the brake band again? Next, do I have to put the pancake (wickelteller) onto an AEG adapter, start playback mode and try to stop the plate by hand? What should I feel and understand?

How am I to check whether it's the pinch roller or not?

I've finally decided NOT to sale the M5 and try to record using BOTH mono and stereo techniques.

Best regards, Vladislav

[Magnettonmanni]

Hello Vladislav,
Don't put the large tape winding plate (pancake) on the right. 
You should never touch it forcefully because it will become out of round.

No, only brake with your hand (glove?) on the belt drive plate.  
  M5 Wickelteller.png (Größe: 18.4 KB / Downloads: 216)

Then hopefully you can feel everything and should report it here in detail.

Was there also the strange noise when the rubber belt was removed. How did you remove it?

You see, I also have questions.

Best regards
Manfred

[Vladislav81]

Hello Manfred,

I'm terribly sorry for not answering our questions, but I've found the extraction of the essay dedicated to the repairing process of this very M5, written by the technician himself.

"Unfortunately, the owner of the tape recorder wished to calibrate it to the not the best tape MTP-480 produced by Kazan factory, and I could not convince him of the wrongness of such a decision for such a tape recorder. The 18 cm reel of this tape can hardly fit 480 meters, which is reflected in its name. Its coating is quite smooth for domestic tapes, but its thickness is a bit more, though still less than that of professional tapes. Because of this thickness, I had to loosen the tension of the tape when winding it up, which resulted in not very stable operation of the right node."

I wish I knew how to increase the tape tension on the right side.

Best regards,
Vladislav

[Magnettonmanni]

Hello Vladislav,
I can't understand your thoughts from posting #109 in connection with the error in your device.

The tape thickness has no influence on tehe error of your device!!!
Tehe error exists without tape!!!

For me is your last posting more the area of Freudian-Magnetic-Tape-Psychology.

You have a mechanical fault that can be felt and I asked you to feel it.
You express your regret for not following my request, but don't write why you don't want to.

You can easily increase the belt tension by moving the tapping on the “Betriebs-Bandzug”--resistance from the picture in article #88 (Frank Stegmeier). 
But that doesn't eleminate the error.
If I were you, I would stay away from it. You will just creat a new dnagerous construction site.

Once again the very clear question: why don't you want to continue so close to the finish line?

The fault lies in the belt or the clutch-disc or the engine. You can find it out by feeling.

I'm also very interested to know what your job is.

Best Regards

Manfred

[Vladislav81]

Hello Manfred,

Yesterday I've put the M5 into the playback mode without the tape and without the pancake on the right side, and tried to hold the right reel holder by hand. I decided not to put off the brake band from the right side as it's not adjusted and the reel holder rotates freely. Well, I could see and feel the uneven rotating of the reel holder. The fluctuations were strong as if the source was the clutch of the winding motor.

Best regards,
Vladislav

[Magnettonmanni]

Hello Vladislav,

I'm glad that you found the error.
Now you can inspect the clutch disc and put it in proper condition.

I wish you much success and lots of fun with your Magnetophon M5.

Best Regards
Manfred