Telefunken Operette 8 tube radio restoration - Part 6. Let's do a visual IF alignment for FM.
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- เผยแพร่เมื่อ 30 ก.ค. 2024
- Telefunken Operette 8 tube radio restoration log part 6.
The visual IF alignment for FM is quite challenging, but possible with fairly simple equipment. It also produces great results in the end.
You can see the complete playlist for this restoration at:
• Telefunken Operette 8 ...
All info on this model at: www.radiomuseum.org/r/telefunk...
See also my playlists on some other complete restorations.
Graetz Super 171W:
• Graetz Super 171W tube...
Loewe-Opta Magnet 3737W:
• Loewe-Opta Magnet 3737...
Loewe-Opta Truxa Stereo 4741W:
• Loewe-Opta Truxa Stere...
Braun Atelier 3:
• Braun Atelier 3
Graetz Musica 4R417:
• Graetz Musica 4R417 re...
SABA Freiburg W2:
• Saba Freiburg W2 (WII)...
Graetz Comedia 616:
• Graetz Comedia 616 tub...
You may also be interested in ...
Capacitor Leakage Tester:
• Capacitor leakage test...
Re-stuffing filter capacitors in this tube radio:
• Re-stuffing filter cap...
Replace Selenium rectifier with silicon diodes:
• Replace Selenium recti... - วิทยาศาสตร์และเทคโนโลยี
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This is the best explanation of how to align an FM that I've seen on TH-cam. Thanks for this video.
Denis Renaud : You’re welcome.
You are an absolute maestro of valve radio alignment! Splendid work.
A sincere "thank you" for the videos you post, including this one. Ignore the occasional troll. Things I admire about your techniques include attention to detail, consistency as to method, and doing a great deal of quality work with minimal equipment. I learned at an early age that the violin does not make the violinist, the camera does not make the photographer, the putter the golfer, or the equipment the technician. Bravo, my friend.
Thank you. Always good to hear this.
After countless searches I finally found a clear, simple, complete explanation of the IF alignment. For a newcomer to tube FM radio restoration this video provided me with the tools to successfully complete this task after so many failed attempts.
I need only two clarifications, one on the alignment of the discriminator performed by looking for the "zero" with the voltmeter while in many articles it was performed with the oscilloscope trying to obtain the fateful "S" curve, and the other question concerns the setting of the oscilloscope in which I have always seen the use of X-Y mode.
Congratulations and many thanks.
I have used that technique in a few of my videos, but can’t remember which. Just search the the channel and look for the FM alignment video of a couple of restorations.
Excellent presentation and explanations, especially showing exactly where to put the scope probes. Thank you!
pleasure
Hard woking, nice alignment!!! Congratulations for all you made with radios and this TH-cam canal!
👍
Thanks! Learned some things! 😊 Wish I could give more.
Thank you 🙏
You're most welcome.
Great repair and restoration videos. There are some great guys as yourself on here sharing your knowledge, the bad part is there is some absolute hacks giving horrible advice on how to do theses alignments. One gent in particular keeps making the same bad practices video after video, some of the viewers call him out and try to explain what he needs to do to make a good repair/alignment to the radio but it goes on deaf ears. It is starting to be a reality comedy show, like watching Benny Hill repair radios lol. While the comedy is worth the watch, those who maybe totally new to this hobby might get a junk radio or worse yet get hurt doing it. Once again thank you for your tips and tricks with thorough explanation on what you’re doing. I’m working on a 1950 AM/FM Zenith right now. All recapped and working but just need to do the FM alignment. Just got a a new Siglent SDG 1000X ARB generator for Christmas. Can’t wait to get into the alignment process. Have done many AM but my first FM.
Thanks for you kind words and good luck with your restoration
Hi Manuel, excellent video, very informative thank you...........................Berni
Brilliant video!!!
David Austerman : thanks. I really enjoyed that one.
Excelente aula, abraço forte do Brasil!
Obrigado
Really good.
👍
thanks for your great video, this is a very effective way to learn Alignment process. Question, in case of measured by digital scope, no need Marker signal?
Not if you are careful to keep the center frequency inbreeding center line.
Really enjoyed this Manuel, I’ve been peaking the IF on FM and ending up with not enough bandwidth so might try this. Just out of interest, this was 5 years ago and it seems in your later videos you seem to go back to the more traditional FM alignment. Is there a reason for this?
Kevin
No reason, just have found that the simpler method suas produced good results and is less fussy to set up.
Fantastic explanation. I need to align a Saba Freiburg 14 in fm, could you help me to do that ? Thanks :)
That’s something that takes more than a “remote assistance” to achieve. It would be practically impossible for me to assist you from this end.
Boas! Is the trigger cable going to Channel 2 of the scope coming from the channel 1 in the back of the signal generator?
Yes, it’s coming from the “trigger out” at the back of the signal generator.
Hello Manuel,
A question;
I want to try my first (visual) alighnment on a Rheinperle 2054, but do not exactly know what the alighment instructions mean with: for the ZF-abgleich: "Ein mit ca. 15kHz Frequenzhub frequenzmodulierter Meßsender" ist an das Gitter 1 der EF85 an zu schließen.
What kind of signal can I use? (I own the same Rigol functiongenerator as you have to create a signal).
Hope you can help, thanks ahead!
Henny Poort
+Henny Poort : my German is very limited, but I think there is nothing too dramatic called for: connect signal generator at if frequency (probably 460khz) modulated at an audio frequency, to the grid of ef89, etc.
But what is "modulated at an audio frequency"? What is set on the generator??
+Henny Poort : yes. Modulation type : AM. Modulation frequency : about 600hz.
Why: -probably 460kHz-? The Abgleichanleitung jawohl, does say 15kHz.... Or does it not realy matter?
+Henny Poort : actually I just checked on radiomusuem. It is actually 468khz. I have no idea what they bring up the 15khz for.
OK, I'm going to have to critique this -
1) there was way too much fiddling with the darned scope - it's not a good scope anyway - analog scopes are way better then these silly, slow-updating digital storage scopes for this kind of work. There's no delay - it's updating 30 or more times per second. Most of the time we couldn't see the scale and with all the timebase fiddling you lost us.
2. you talked about stagger-tuning the IF's at three frequencies and that would have been great but you never came back to it!
3. You could have just used markers and that would have eliminated all that messing about with the scope settings . A lot of time just got wasted in this video. If you'd just used a proper sweep generator then you'd have had all the markers and you could have actually imparted some useful info. As it is, we were all dragged along while you dithered about.
Somebody said this was the best FM alignment demo yet but I'm afraid it still missed the mark. It's nowhere near precise enough of a demo.
Here's what's missing:
You didn't identify for us the type of FM detector.
You didn't talk about whether you were going to use modulation or not and why.
You never mentioned stereo and the FM IF bandwith that's required in order to accomodate that.
I've watched so many people put out these videos and none of them have actually made the definitive FM alignment video. All have missed the mark. Sorry - but that's the sad truth.
When you're doing this type of work it requires that you be precise and if you;re going to teach others how to do it then you need to be really thorough. It will pay off very well if you actually produce the holy grail of videos: an actual ace of a video on exactly how to do FM alignment, both mono and stereo, leaving no stone unturned. In other words the DEFINITIVE VIDEO.
Food for thought 👍
I think the critic needs to make a video!