I live in Seoul, Korea I have a hobby to collect and repair old radios. The images you uploaded help me understand the radio system. I do not speak English well You speak very slowly The pronunciation is very slow, accurate and kind. You also draw a lot of reference images and upload them with the video It helps a lot of non-English viewers. I always appreciate your good video
@AllAmericanFiveRadio
5 жыл бұрын
THANKS
@AllAmericanFiveRadio
16 жыл бұрын
Ho wow thanks. This wiring diagram is from the RCA radio model 9X571. It is a very typical design and many other manufacturers used a close cousin to it.
@AllAmericanFiveRadio
16 жыл бұрын
Thanks. The AC bias in your cassette records also uses a tank circuits mostly. If you have a wiring diagram for your recorders, that coil that you identified in your AC bias video, should have an in-phase connection from the coil to the base of the transistor associated with the AC bias circuit, it can be incorporated with the erase head.
@AllAmericanFiveRadio
16 жыл бұрын
Thanks John, I have lots of drawing, photography, and publishing software tools that I used for jobs and my books. Had no idea, when I bought them, how great they would work for KZitem videos. Regards Rick
@AllAmericanFiveRadio
16 жыл бұрын
I was going to talk about the regenerative circuit on my Crosley Pup video but I could not find a wiring diagram for it. However I found my Deforest-Crosley model 51, it is a regenerative circuit and I have the wiring diagram. I have not fired this radio up in years so if I can get it to work I'll do a video on it soon. The regenerative and super regenerative receiver circuits are very similar. The super usually has more tubes and better regenerative controls.
@AllAmericanFiveRadio
16 жыл бұрын
Also the higher the intermediate frequency, the more audio information can be carried, resulting in higher quality audio. The FCC cleared 455KC, no broadcasting allowed, it's an odd harmonic, and all AM stations are even harmonics which also helps to eliminate other problems.
@pozitroniac
13 жыл бұрын
WONDERFUL AND SO INSPIRING..IT HELPED ME TREMENDOUSLY IN UNDERTANDING THE CONVERTER STAGE ..SO MUCH TO THE EXTENT OF TURNING MY GRANDMOTHERS DUSTY AND RUSTY DEAF RADIO INTO A SINGING LOUDLY NIGHTINGAIL...IAM VERY GRATEFUL TO YOU...MANY THANKS FOR BEING SO INFORMATIVE AND SUCH A CALM AND INTEGRATED PERSONALITY...HAVE A NICE DAY...
@AllAmericanFiveRadio
16 жыл бұрын
Thanks, and I'll keep trying. HO, that's a very good question, and there are a number of reasons. The early radios by different manufactures use many intermediate frequencies, like about 175KC, and notice that this is an odd harmonic. If for some reason there are broadcasts using 175KC it would always interfere with the operation of that radio.
@AllAmericanFiveRadio
16 жыл бұрын
Figures, lol. Good question. The 12SA7 is doing multiple jobs, the tank circuit in the primary of the 1st. I.F. and the tank circuit in L1 & C1 are causing the distortion. L2 is just a coil and it has no capacitor across it to smooth out the wave-form and of courses you can't put one there because you would have another tank circuit. And Thank!
@uploadJ
16 жыл бұрын
Ah! A "pentagrid converter" like a 6BE6 and 12BE6 tubes as some of us learned in school! Great series of vids!
@AllAmericanFiveRadio
13 жыл бұрын
Thanks sloppyoscar Yes it is wound so that is it in phase or they reverse the leads to put it in phase. But it must be in phase for positive feedback.
@TheNixJohn
Сағат бұрын
Most important video thank you love from India 😊🎉
@AllAmericanFiveRadio
13 жыл бұрын
@AndyDaviesByTheSea Maybe. The only way to find out is to move it. But I don't it would Oscillate as strong.
@marouaniAymen
Жыл бұрын
Thanks for this video, I did learn a lot about radio circuitry electronics, I have a question: What if the Oscillator Frequency is less than the Radio Frequency, what will happen if OL - RF < 0 ?
@AllAmericanFiveRadio
Жыл бұрын
Then the I.F. would be within the band.
@AndyDaviesByTheSea
13 жыл бұрын
Hi Rick, thanks again for the video If you run to 2 minutes 23 seconds where you discuss R2, is there any significance for connecting the earthy end of R2 to the top of L2? Could R2 have simply been connected to ground, or would that sort of decision been made on the assembly line where it may have been more convenient to solder R2 across the valve holder? Or is there some interaction between the cathode and grid against the resistance / impedance of L2 that I'm missing? Kind Regards. Andy
@PatrickInCayman
4 жыл бұрын
Your videos are always so well explained and just awesome Rick. Could you do one someday on how later FM tube stereo radios decouples the stereo from the signal? Like a vintage Fisher FM 50B or something like that? Thanks for the awesome vids as always!
@PatrickInCayman
4 жыл бұрын
Hi Rick, I think I found it, nevermind ;) Thanks!
@AllAmericanFiveRadio
4 жыл бұрын
Yes I do have a few videos on FM. But let me know if you need more information.
@AllAmericanFiveRadio
13 жыл бұрын
@ElectricSparq I did not see one listed.
@AllAmericanFiveRadio
13 жыл бұрын
Thanks mamoynas And thanks for letting me know about the link. I changed servers and I knew I would not find all my KZitem links. This one now works.
@cyberlightbeing
16 жыл бұрын
Great video - many thanks, I really like your explanation & circuit analysis, please do more. One question if I may (sorry if it sounds so basic) why is the 455KHz was choosen as an IF freq for AM radios?
@joernone
16 жыл бұрын
Rick, As always, a superb video. Detailed technical explanation and use of graphics are extremely well done. I'd rather watch one of your videos than go to the movies...and I love Indiana Jones and Iron Man.:) Regards, John
@CassetteMaster
16 жыл бұрын
That's a neat and very well-done video!
@majorfifth3708
Жыл бұрын
Hi! I’m a rank beginner so please bear with me… from my understanding, the tank circuit causes B vs E to reverse polarity at a frequency controlled by L3. What I don’t understand is your statement that A and E are always in phase. Would that not mean that the cathode loses its negative charge every cycle?
@AllAmericanFiveRadio
Жыл бұрын
Oscillators, the Basic Tank Circuit 1 kzitem.info/news/bejne/x4dq34aMfqyJhHY LC Resonance Oscilloscope Demo kzitem.info/news/bejne/qJWIqa16naZjpYI
@Hammondlover2
16 жыл бұрын
More gold from the mine. Which radio's schematic did you use for this example? It looks familiar.
@Rainbow__cookie
4 жыл бұрын
I have a ecc85 but its pretty simular as the 12at7 And look like it uses the anod instead of the grid Isnt they all based on 12ax7? Its pretty smular name
@AllAmericanFiveRadio
3 жыл бұрын
They both have the same base 9A. Tube information link nj7p.org/Tubes/SQL/Tube_query.php?Type=12at7
@TheCrisatube
5 жыл бұрын
Hello could you please tell me the value of a local oscillator coil for om? thank you so much
Is it possible to make a frequency mixer out of chunks of metal like the first transistor was made?
@AllAmericanFiveRadio
11 жыл бұрын
Some early transistor radios used the ferric iron core antenna as a mixer. Both the signal from the station and the signal from the oscillator were mixed on the ferric iron core.
@Kennynva
6 жыл бұрын
Just a thought,,, can you use a 455khz crystal, or CF in place of the first IF cans..???
@AllAmericanFiveRadio
8 ай бұрын
Yes.
@AllAmericanFiveRadio
13 жыл бұрын
Thanks pozitroniac
@AllAmericanFiveRadio
16 жыл бұрын
THANKS!
@ElectricSparq
13 жыл бұрын
Hi, Is there a sovtek equivalent for the 12sa7? Thanks for the video.
@mamoynas
13 жыл бұрын
nice video... the link is Redirected though...
@bobdoritique7347
2 жыл бұрын
Merci for this video.🙂
@AllAmericanFiveRadio
2 жыл бұрын
Thank you, and your welcome.
@ken415
4 жыл бұрын
merci bien c est tres interessant voc presentetions
Пікірлер: 46