Vintage Braun SK25 Radio Revival: Complete Electronics Restoration & Alignment - part 2
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- Опубліковано 16 вер 2024
- Only $5 for 10 PCBs and every new member get $5 bonus. + Express 24 hour / 48 hour service on www.pcbway.com/ ➠ ➠ ➠ In this second video of the series, I dive into the electronics restoration of this iconic Braun radio. My goal was to preserve its original character as much as possible, so I only replaced components that were out of spec or no longer functioning. There was some light cleaning involved, but not much was needed. After completing the repairs, I tested the radio and performed a full alignment of both the IF and RF circuits for the AM and FM bands. Join me as I bring this vintage beauty back to life, ensuring it sounds just as good as it did decades ago!
🎥 Back to basics Series
Many tasks in this video are covered briefly, without deep explanations of the theory-especially for those new to tube radio restoration. For a more detailed understanding, I’ve created a tutorial series called “Back to Basics,” which goes into the concepts in depth. I recommend watching those videos to better follow the steps I don’t fully explain here. The playlist is:
• Back to Basics
🎥 Other videos related in this project:
■ Braun SK2b - • Braun SK 2/2 tube radi...
■ Braun SK2/2 - • Braun SK 2b tube radio...
■ Braun T1000CD - • Braun T1000CD repair -...
■ Braun Atelier 3 - • Braun Atelier 3 Stereo...
■ Back to Basics 1 - • The Parts That Make Up...
■ Back to Basics 2 - • Checking the Power Sup...
🙏 Want to support the channel? ●●●●●●
/ mcaldeira
paypal.me/maca...
#tuberadios #antiqueradio #radiorestoration
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Nice work! It fascinates me how these old radios can so often (maybe too often!😁) catch one out with the simplest of things. The AM apparent issue on this one being a good example. And the doubts you had on the RF alignment is a reflection of the skill and experience that you have with these. Makes it a joy to watch! The phono input is an interstng one. Maybe Braun were ahead of their time. Stick a microphone on that input and you have an instand karaoke machine! Sing along to your favourite radio station...
😊 Didn’t think of the karaoke option …. Way ahead of its time 😊
@@electronicsoldandnew I suspect Braun were far too 'chic' for karaoke! 😂But it does still make you wonder why they wouldn't have a three position switch?!!
They must have stocked way too many switches for the previous model 😊
Nice little radio, good result as always, Manuel! Actually, when I saw the antenna input circuit, I understood why..
👍
Hi, Mr.Caldeira. If I'm not mistaken, AM IF it's said to be 445 kHz and you align it at 455 kHz. Cheers and thanks for taking your time to show us many interesting videos!
That’s is an error in the drawing. It’s 455, and a quick test before starting confirmed it.
Neato....
I am building a regenerative receiver using copper clad boards and raised islands in more or less Manhatten style. I thought I had all the parts I needed in my assortmant of cap kits & etc, but I lacked a 1k & 150k potentiometer & two diodes with one being a specific zener.
Wanting to follow specs I ordered the parts. Honestly, I would have used DigiKey or Mauser, but their web pages are hard to use on a cell phone, my only internet gateway. Actually, I'd use these suppliers if a part like a 150k potentiometer did not return hundreds of options or if I knew what the heck the difference was given by the descriptions so I used EBay.
I think it was exactly $31 with shipping & tax being about 1/3 the cost. Sure seems pricey given you could buy a fully assembled $15 Am/Fm/Sw radio out of China. I do salvage as many parts as I can from thrift store items such as transformers, variable capacitors & even wire. On the other hand is there a better source for getting needed parts on a one or few part basis? If so I'd love to hear about it.
It is very much appreciated, please.
Great work. That antenna thing was screaming at me from the start and I was wondering why there is no ground plugg. Thanks for the great videos. Always gives me something new.
👍
Well, about the antenna plug: it could be worse. Last week I spent half an hour debugging why I didn't have AM reception on one of my radios. Turned out I had connected the antenna to the pickup input. 🤦♂️ Then you truly feel like an idiot.
Anyway. Great job again on this little guy. Looking forward to the finished result.
😊 that must have been frustrating. We all do these things sometimes.
A wacky antenna set up and a wacky aux input, other than that a nice neat design... and simple. Good work on remaking the dial Manuel. I missed part one I think 🤦♂🙂
👍 wacky indeed
Btw, still have a question about the previous video.
Why did you still went for a single diode rectifier and not just a bridge rectifier?
A bridge rectifier would double the rectified frequency and therefore lower the ripple and noise. There was plenty of space for it
I think that's always a good thing 😊
The transformer ground was connected at the transformer, and I did not want to change the design concept at all. The fact that there is no hum tells us that it’s fine as a half-wave rectifier.
Bom trabalho :)
Obrigado
Those so called 'roundy' resistor's always fail, compare to the "Allen-Bradly" still resistors. 👍
True
Braun Design criteria probably told the engineers we cant have a three position switch because it would spoil the looks. P.S. Profit selling your vintage Braun appliances yield a better return than one gets from the stock market.
👍 a new investment opportunity 😊