How To Check the Power Amp Stage - Tube Radio Restoration Back to Basics part 4

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Only $5 for 10 PCBs and every new member get $5 bonus. + Express 24 hour / 48 hour service on www.pcbway.com/ ➠ ➠ ➠ Without audio, a tube radio is absolutely useless, so that's what I check out next. I also explain the circuit theory and show how it all fits together in the system.
I hope you enjoy the series, and invite you to comment.
🎥 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...
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Опубликовано:

19 апр 2024

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Комментарии : 50

@ralphj4012 2 месяца назад

Enjoying this series. For your next project, how about a bot destroyer (uploaded to PCBWay)?

@electronicsoldandnew 2 месяца назад

😊

@WECB640 2 месяца назад

This is one of the best explanations of how "vac-you you you-m" tubes work. 73 OM

@electronicsoldandnew 2 месяца назад

Thanks 😊

@TrevorsBench 2 месяца назад

Good job explaining the operation of the tube. I guess this is why the greybeards called them "valves". Keep up the great content!

@comment8767 2 месяца назад

Only Brits call them valves.

@TheEmbeddedHobbyist 2 месяца назад

@@comment8767 I'm a Brit and have a greybeard and call them valves, so you are both correct. Tubes are used as the very large valve in old TV's e.g. CRT's Also fenders go on boats not cars 🙂

@electronicsoldandnew 2 месяца назад

South Africans, Australians, New Zealanders, … I’m sure I’ve missed a few 😊

@electronicsoldandnew 2 месяца назад

😊

@comment8767 2 месяца назад

@@TheEmbeddedHobbyist Americans, in my experience, mostly say "bumpers" when referring to cars, although there is the expression "fender bender", which may be a concession to poetic symmetry. For the most part, bicycles have fenders, cars have bumpers. "Valve" is more descriptive of the function of the device as a switch or amplifier, so it is ironic that an American invented the first device that operated as an amplifier, whereas Fleming invented a mere diode "tube".

@mackfisher4487 2 месяца назад

Nice explanation professor

@electronicsoldandnew 2 месяца назад

Thank you

@maartenschapendonk6345 2 месяца назад

I do like your way of explaining things

@electronicsoldandnew 2 месяца назад

Thanks

@SR-ml4dn 2 месяца назад

good video no rush and fine explanations especially for the tube characteristic and the high impedance for the input signal

@electronicsoldandnew 2 месяца назад

👍

@tubeDude48 2 месяца назад

👌👍 Same steps I take. This is a good series for newbies, but they need to understand how a CAP or resistor, and other components work first.

@electronicsoldandnew 2 месяца назад

True. You can only teach literature to someone who’s learnt how to speak the language, at least. Actually, leaving some things unexplained may be a good idea: if someone knows absolutely NOTHING about electronics, they should definitely NOT be messing around with equipment that works with hundreds of volts 😊

@tubeDude48 2 месяца назад

@@electronicsoldandnew - True.

@sajusebastian4991 2 месяца назад

@@electronicsoldandnew you are right

@josephmagedanz4070 2 месяца назад

Another interesting, helpful video...thanks!

@electronicsoldandnew 2 месяца назад

Pleasure

@JonRig 2 месяца назад

I love the journey you are taking us on with this series. Your approach is second to none and the fact that the set has not yet been anywhere near mains voltage shows the level of respect that you have for these older radios, which is what they deserve. I have been watching some alternative approaches that are more along the lines of turn the set on and see what blows up and use that as a guide to what needs changing. I think this systematic approach is far superior! 😁

@electronicsoldandnew 2 месяца назад

Not as much fun, though 😊

@JonRig 2 месяца назад

Yup, it's got me watching those videos so hard to argue on that one!! 😂

@rikkies5249 2 месяца назад

Again an excellent explanation!!!

@electronicsoldandnew 2 месяца назад

👍

@lyntonprescott3412 2 месяца назад

Excellent!!!

@electronicsoldandnew 2 месяца назад

Thank you

@DavidTipton101 2 месяца назад

Great work Manuel 😊

@electronicsoldandnew 2 месяца назад

Thanks Dave

@ralphmans 2 месяца назад

Fantastic video, excellent. You explained it so even I understood it 👍😁

@electronicsoldandnew 2 месяца назад

👍

@BJcanal270 2 месяца назад

Very interesting

@electronicsoldandnew 2 месяца назад

👍

@kemaltsoofy498 2 месяца назад

Great job !

@electronicsoldandnew 2 месяца назад

👍

@danzon21a2 2 месяца назад

Muchas gracias por esta serie de videos, sus esplicaciones son muy faciles de comprender, tengo un Philips 392 (B3D92A) que voy a empesar a reparar (por fin!) con mas confiansa, seguire los pasos que Ud. esta usando como guia, de nuevo muchas gracias .........

@electronicsoldandnew 2 месяца назад

Pleasure 👍 good luck

@paulperano9236 2 месяца назад

You can do the same biasing technique to JFETs & MOSFETs. No current in to the gate due to their extreme impedance. Valves and FETs work the same - controlled by voltage at the gate/grid. As opposed to BJTs which need current in through the base to make them work. As for the caps - I replace them all on principle, except micas or polystyrenes. The price of a capacitor is nothing compared the cost of a valve or transformer. They may test ok, until the they get high voltage ...

@electronicsoldandnew 2 месяца назад

👍

@jamesmdeluca 2 месяца назад

Greetings: During the explanation of the power amplifier tube, the screen grid voltage is shown applied to grid 4 instead of the grid 3 which is the actual screen grid. Grid 4 is the suppressor grid or beam guides, usually near ground potential. There is no affect on the supplied circuit description.

@electronicsoldandnew 2 месяца назад

You’re absolutely correct. I’ll mention this in the next video. Thanks. 👍

@TheEmbeddedHobbyist 2 месяца назад

For the last capacitor did you fit the new one so that the outside foil end was connect as per the original. Or do you expect it to have made little difference to the noise floor?

@electronicsoldandnew 2 месяца назад

I always have these caps checked before using. Not sure how much difference it makes with modern caps, but I do it anyway as a habit.

@radio-ged4626 2 месяца назад

OK, so you want criticism? It's hard to criticise because everybody who has experience in electronic repairs knows there's more than one way to skin a cat. But I could postulate that using an electrolytic capacitor that is rated far in excess of what is needed could lead to early failure of that component as it never gets fully formed. So if the capacitor is rated for example at 6.3v and you put a 50v one as a replacement, it's probably not the best use for it. Of course I don't know what the original rating of the capacitor was you changed so it might not be that far out 😀 That's enough hair-splitting for one day - I haven't got much hair left. Your explanation of the audio stage was clear and easy to follow. Really - I have no criticisms. BTW I have a small transistor radio which has 50V rated capacitors in place where the circuit diagram rated them at 6.3v, they are over 40 years old and are still fine.

@electronicsoldandnew 2 месяца назад

👍 I agree that the ratings shouldn’t go too far beyond the original rating, but in this case I have a good excuse: I ran out of 25v caps 😊

@radio-ged4626 2 месяца назад

@@electronicsoldandnew 🤣