Preamp, Tone Shaping and of lots of detail - Tube Radio Restoration Back to Basics part 6

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Electronics Old and New by M Caldeira

2 ай бұрын

Only $5 for 10 PCBs and every new member get $5 bonus. + Express 24 hour / 48 hour service on www.pcbway.com/ ➠ ➠ ➠ These German tube radios were designed with sound quality in mind, and the way they achieved that is really astounding. That's what I want to go into in this video. The preamp, as simple as it is, is surrounded by a really complex tone shaping network that is a work of art, both in its complexity, and ultimate result.
I hope you enjoy the series, and invite you to comment.
Errata: The pin 1 used as a convenient solder tag is actually on the socket used as the interconnect for the tone buttons, and not on the EL84 socket as erroneously mentioned in the video.
🎥 Other videos in this series:
■ Back to Basics 1 - Tube Radio Anatomy: • The Parts That Make Up...
■ Back to Basics 2 - Tube Radio Anatomy: • Checking the Power Sup...
■ Back to Basics 3 - Follow the B+: • How to Check the B+ Sa...
■ Back to Basics 4 - Testing the power output: • How To Check the Power...
■ Back to Basics 5 - How to safely test the output tube: • How to safely test the...
🙏 Want to support the channel? ●●●●●●
/ mcaldeira
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#tuberadios #antiqueradio #radiorestoration
●●●● HUNDREDS OF OTHER VIDEOS TO CHOOSE FROM ●●●●
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Пікірлер: 48

@petersdelucaaa2vg306 2 ай бұрын

Manuel, Excellent explanations. The hobby is much more rewarding when you understand how these radios work. I also want to thank you for the solder wick recommendation you made several videos ago. Chem-Wik works like no other wick I have used in the past. Keep those soldering tips and tricks coming.

@electronicsoldandnew 2 ай бұрын

👍

@retro_tech 2 ай бұрын

Simply amazing videos, Manuel! I wish I could go back in time and show this series to my younger self when I was learning to work on tube radios. It would have made everything so much more understandable. Fantastic job. Looking forward to the next one!

@electronicsoldandnew 2 ай бұрын

Glad you enjoyed it

@harrilumme1875 2 ай бұрын

Thanks again Manuel! Once more you excelled yourself in presentation skills (at 3:30). The animation of the switches really hammered it home even for the most slow-witted of us. I believe you even thought of syncing the swiching sounds to the clip.👍👍

@electronicsoldandnew 2 ай бұрын

The sounds come from the mouse … a fortunate coincidence 😊

@steelcity321pb6 2 ай бұрын

Thank you. Brilliantly explained in what was a short space of time. Takes me back to the radio theory, practicals, and examinations during the first year of my apprenticeship (1971 - 76). Best regards, Phil.

@electronicsoldandnew 2 ай бұрын

👍

@RI-ns8wz 2 ай бұрын

Nice video, as usual ! That "contraption" R+C covered in copper tape , looked like a NASA satellite!. Looked amazing the way It was! You should have covered It with transparent isolation and shine a light on It! Applauses from Argentina!

@electronicsoldandnew 2 ай бұрын

😊 👍

@ralphj4012 2 ай бұрын

This is a very important resistor as well, because if this is leaking DC, that can be a problem as well (12:24). Still learning something new every day, ho, ho. Seriously though, keep up the good work.

@JonRig 2 ай бұрын

I cannot tell you how useful I am finding this series. It's superb and so well explained. I rather enjoyed that little gotcha on the last video (Bass v TA); it got the old grey matter working! 😁 I can see that pin one on the EL84 confusing the hell out of me one day so I will try and remember that for future reference. Also, great to see the new build on that shielded capcitor and resistor. Great work!

@electronicsoldandnew 2 ай бұрын

Thanks 😊 and once again, apologies for the sleepless nights 😊

@heleneivers7669 2 ай бұрын

they say it's a bad when you dont learn something new, well this has been a very good day for me. thank you

@electronicsoldandnew 2 ай бұрын

My pleasure 😊

@tubeDude48 2 ай бұрын

👍 I don't recall ever seeing an American radio that uses an equivalent EABC80 tube like this. (Although I haven't looked into my cross-reference manual's.) Your RC circuit looks quite nice. That feedback is what gives it that Hi-Fi quality. As you said, (the richness!)

@electronicsoldandnew 2 ай бұрын

👍

@jdmccorful 2 ай бұрын

Good one, especially with info to build shield resistor/capacitor. Thanks!

@electronicsoldandnew 2 ай бұрын

Pleasure

@jdmccorful 2 ай бұрын

@@electronicsoldandnew right back at ya!

@haraldlonn898 2 ай бұрын

Great work as usual. Thanks for all this great videos.

@electronicsoldandnew 2 ай бұрын

My pleasure

@josephmagedanz4070 2 ай бұрын

Another video I happily watched to the end. It confirmed several things I thought I knew (and I did, as it turns out) and taught me several new things. So thanks for that! Looking forward to the next installment.

@electronicsoldandnew 2 ай бұрын

👍

@pbaemedan 2 ай бұрын

Thanks!

@electronicsoldandnew 2 ай бұрын

Thank you

@mackfisher4487 2 ай бұрын

Manuel, Thank you for helping to bring more hobbyist into the radio restoration hobby. Your technique of teaching using schematic to explaining fundamentals rather than showing how to replace capacitors and resistors is commendable. Don't get discouraged about the number of views on this series as a lot of your viewers have a good understanding of electronics. I think your neighbor's dog has a question.

@electronicsoldandnew 2 ай бұрын

I really enjoy making these videos as it forces me to go back to when I was starting out in this particular hobby. I constantly have to remind myself to not gloss over things, which makes the videos “schematic heavy”, but that’s the way it is. I have often wished I lived in a bigger city which would allow me to do what I’ve wanted to do for a long time: organise a weekend-long “bring your own radio to restore”. That would be fun. Unfortunately in Madeira we just have too few people to make that work.

@JonRig 2 ай бұрын

@@electronicsoldandnew Manuel, I would be the first in the queue for that!!!

@electronicsoldandnew 2 ай бұрын

Maybe I should relocate to mainland Portugal 😊

@mackfisher4487 2 ай бұрын

@@electronicsoldandnew Manuel, you live on fantasy Island, set your apartment up as a one month exchange with a well vetted high-end home owner in a large city. With plenty of shopping to quell white noise. Then set up your group radio restoration venture.

@electronicsoldandnew 2 ай бұрын

😊

@jrhfeytons6745 2 ай бұрын

Another great video, Manuel Now I'm curious how you will explain the ratio detector in simple terms. 😊

@electronicsoldandnew 2 ай бұрын

😊 I’ll find a way

@paulviasound2796 2 ай бұрын

What software and video editing tools do you use for the onscreen schmatics, you make it look so easy on the edits. Wonderful walk through on everything!

@electronicsoldandnew 2 ай бұрын

I’m actually using GIMP right now and using QuickTime to screen record. It’s a free alternative to photoshop. The cutting is done in Davinci resolve (also free).

@harveyellis6758 2 ай бұрын

I watch all youtube videos at 2x speed ;-)

@electronicsoldandnew 2 ай бұрын

Me too 😊

@ricardoaliasdelatorre6836 2 ай бұрын

Manuel, nice explanation about NFB,and those highpass ,lowpas filter cells.By the way which is "Solo" key ..is it a voice content preset??.Thanks in advance.😃😃

@electronicsoldandnew 2 ай бұрын

I think so. Maybe for opera arias or something similair.

@davesage9190 2 ай бұрын

What type pf capacitor are the yellow ones you use?

@electronicsoldandnew 2 ай бұрын

Nichiden. I buy them from BanzaiMusic in Germany.

@davesage9190 2 ай бұрын

@@electronicsoldandnew No I meant type. Polyester film, mylar etc. etc.

@electronicsoldandnew 2 ай бұрын

Metalized polyester

@davesage9190 2 ай бұрын

@@electronicsoldandnew Great. Thanks

@HyyskanPolttaja 2 ай бұрын

Thanks for the video Manuel. In my opinion, all these 'tone shaping' features are just gimmicks that radio manufacturers added to their products to boost sales. They seem designed to create an illusion of 'progress.' I own a tube radio from the late '50s (an ASA 1147) that has bass and treble controls, a piano key marked 'speech,' and three extra buttons labeled 'solo,' 'orchestra,' and 'jazz' - with 'orchestra' simply meaning neither 'solo' nor 'jazz.' These controls can really mess up the sound. Plus, I don't see why high frequencies need to be boosted so much when listening to jazz music.

@electronicsoldandnew 2 ай бұрын

I must admit I’m more fascinated by the lengths they go to to change the tone, and I really like seeing the means they use to achieve this.

@HyyskanPolttaja 2 ай бұрын

@@electronicsoldandnew Yes, they are engineering gems, although they add useless features, unnecessary complexity and cost.