I've been away from electronics since the late 80s. At 65 I got my ham liscence and been on a relearning curve for last three years. Thanks for this and other videos which finally give me a ahaaa moment . Your succinct explaination in a short video gelled so much info. Appreciated in this over the hill brain.
Thank you Rick, for such a basic walk-thru. It really pulls together so many things for me. This video is terrific, outstanding, really. You have really raised the bar with this recent graphic. I very much appreciate the time you put into these videos.
Thankyou for being a great mentor and teacher to us out here that are trying to learn. You do so much to help us understand.Great video,I just fixed my first radio ,a bad .02 cap leaking badly to ground on an old Hallicrafters s40a ham set.cut it loose and the old girl came to life with a new 1000 ohm resistor installed that was toast.
Beautiful video how the radio signal goes through all the stages ,from the aerial to the loudspeaker and the AVC circuit very clearly explained how it works as well as the oscillator circuitry. The colouring of the path where the signals go through is simple wonderfully clear. Thanks for the very tutorial explanation and the clear lesson.
Thanks Rick for another great video. Watching your videos always seem to increase my understanding of topics I thought I knew. Thanks for re-educating an old HAM.
Your AM radio videos are the best I've viewed on CZcams! I have learned so much from you! Thank You and keep them coming!I also downloaded you PDF book Thanks!
I realise that this is an old video,. but I have just come across it today. Thank You for a very clear and concise explanation of the signal flow through a radio. Your colouring of the signal path at the different stages makes everything very clear.
Totally awesome video Rick.... Your patience and expert teaching style have helped me to understand AA5 and other radios so well. It's really humbling trying to find the words to thank you for carrying this knowledge forward.....
Thanks very much for getting back, I really appreciated it. This Astor BPJ I was working on was a customer repair, I have been doing this for nearly 5 years and have fixed all the sets I have worked on, probably about 40/50 or so and this fault was really doing my head in as he bought it on Ebay “working” and it had a few loose joints a broken leg of a new cap and a O.C resistor. I have been looking at this for weeks and trying different things, then yesterday the way you broke up this video in stages made me think if I connected some headphones to the input of the power tube after c15 in you schematic that may narrow down the fault which it did. So You did help me. So Thanks again.. Great video
Rick, Thanks so much for showing, with your highlighted schematic, how an AA5 operates. I knew the basics, but your video shows all the details. The good news is that I can re-watch your video as often as necessary until it sinks in and takes hold. Regards, Tom
That was a really great video! I've studied electronics and I got my diploma as a technician, but the course was really short (2 years) so we didn't have time to go too deeply into stuff like that. Now I understand how a radio works. That's really cool!
Really nice work Richard!! I particularly like the way you explained about the effective zero output of audio (signal cancelling out) if you tried to sample signal before it goes through the detector. Crucial information explained well. That was great fun to watch!
Fantastic video! Thanks. Nice refresher for me. BTW in describing the first IF you said the frequency that will be used was 455kc and 455Hz. Just wanted to mention that. Thanks for all your hard work
Thanks to you Rick. I'm finally getting it. I have found your videos extremely helpful. I've bought an old Grundig 5077 that needs work and I've been trying to do this myself. I'm a mechanical Engineer and so far my understanding has not been sufficient to do this. The radio has got Hum when you up the volume, Has poor FM reception and the volume periodically changes on its own. It has had most of the Caps changed (by the previous owner) but not all. I was finding the circuit very complex and difficult to follow but slowly with your tutorials it is coming into view. Very grateful to you for your clear and concise videos.
Thank you, and your welcome. I think my FREE eBook may help. PASSWORD is allamericanfiveradio drive.google.com/file/d/1HHmaWYr7UMACfmS4W5uL6PADoem2KlRp/view?usp=sharing
Thanks Philip Booth, R13 and R14 are biasing resistors. R14 races the voltage of the cathode 5.2V above ground, R13 sets the bias voltage at pin five for the control grid.
Thanks so much Richard... This is the best video on this aspect of radio that I have ever seen. This really helps to clear things up for me. Thanks for the downloads too.
Very good explanation! I feel like someone just told me the secret to a magic trick that I've not been able to figure out. Understanding is a beautiful thing! You are an awesome teacher. Keep up the good work.
Wow Rick! I have been in electronics, professionally since the 70's and have NEVER seen a more definitive and clear presentation of how the signal flow in a radio schematic works in all my life. Bravo! If some day you could do the same for a vintage CRT based TV. This would also be absolutely fantastic. Excellent job! The pinnacle of demonstrations.
Pin five, a plate, and pin three, the cathode, is a rectifier. It cuts the signal in half. The 155 pF capacitor drains off most of the 455 kHz signal and blocks the audio. The audio then travels down to the high side of the volume control.
Rick, Your explanations for amplifier stage phase inversion, and detection are very clear. Much better than any textbook I have read besides yours of course. I have two questions. 1. When and how is the other detector plate pin 4 of the 12SQ7 used? 2. Is a vacuum tube detector more efficient than the galena crystal or say the 1N34A diodes used in crystal radio circuits?
Thanks Rick for this awesome video. I am trying to restore an old Hallicrafters S-38E which I believe is an AA5, just using a slightly different set of tubes. I appreciate all the effort to highlight the parts of the circuit as you were addressing them. This must have been a good bit of work but it makes your explanation very clear. Kind of funny, I just purchased a book about the AA5's on Amazon that appears to have been authored by you! Can't wait to get it! Thanks again. -rod (K1ROD)
Hi Rick, 13:06 running time but I know it took many hours in the making. I hope your work stays on CZcams for many years as I'm sure your efforts will go a long way to help folk in preserving some lovely old radios that would otherwise bite the dust through lack of understanding. A very useful description in 13 minutes well done! Kind Regards ... Andy
Ain't was a very tuition way of explaining step by step the path of the signal from the aerial input to the loudspeaker including the circuit for the AVC according to the strength of the received signal . Thank you very much indeed. I think you should print a book accordingly , it would be a bestseller for the electronics basics.
Thanks GeoN0JRJ You're welcome to use this video for your ham club, I hope it helps the members to understand superheterodyne receiver's. The two links to the drawings I made to fit on an 8.5 x 11 sheet of paper. Hope this helps, Rick
Thanks Douglas Tees I thought I sent a reply but I can't find it, must be another CZcams improvement. In the circuit the vacuum tube would work better because it matches the impedance of the IF secondary. Generally, solid-state is more efficient but it is low impedance.
Beautiful! Thank you for this video. I have so much difficulty following these more complicated circuits and these 'signal trace' videos are very helpful and very much appreciated. I suppose the tube could be replaced with transistors?????
@allamericanfiveradio I have an AA5 I just purchased in good condition works well and I assume the bulbs are still good. My only problem is that it only picks up one station and faintly picks up another. What can I do to help pick up more stations?
Fantastic, fantastic video. It clarified a lot for me; albeit I'm late to the party! I just need to clarify for my self the AVC. If it reduces the negative to the grids, I thought that would lower the plate current!. I'll do more reading.
Thank you , and your welcome. Here are two videos that may help. Automatic Volume Level Control AVC ALC czcams.com/video/NUerOOaKFP8/video.html Superheterodyne AA5 from End to End czcams.com/video/glakoNN4lwA/video.html
Rick great video I,ve been interested in tubes for a while and found your vid very informative. I got a late model AA5 a few years ago with the intention of re capping it as it has a very bad Hum.now i'm going to get to it this week.BTW i have a question what would happen if C17 was either shorted or open in the circuit? I have another radio which has one that is split open end from end and i get no sound at all just a slight whistling noise as i rotate the volume control>Thanks.jim
Thanks for a really detailed explanation, I guess I could troubleshoot an AA5 now without much trouble thanks to you, also helped with all valve radio troubleshooting.....................Ray H. ( from the U.K. ) Liked and subscribed.
That was the first, really clear explanation of signal flow I've encountered since I began playing with radios 50 years ago (Yikes, did I really say that? 50 years, phew.)
Thank you. These videos may help. Superheterodyne AA5 from End to End czcams.com/video/glakoNN4lwA/video.html Superheterodyne RF Mixer Visual Color Demonstration czcams.com/video/OgU5aAzjR-k/video.html Superheterodyne Radio, heterodyning frequencies together, how it works czcams.com/video/5F-iKiltesU/video.html
Richard, When identifying the AVC/AGC line in any radio schematic, is there a surefire schematic landmark to go to first, for someone new, in finding/tracking it?
I found the video very informative. I recap old shortwave receivers once in a while, and struggle with the flow of the schematics. Soon, I plan to recap a Zenith 6G601. 73 Paul AA1SU
If the question is: for what purpose do you use the internet most of the time? Then watching, enjoying and learning from CZcams channels like AllAmericanFiveRadio would definitely be in my top 3! I can’t thank you enough for all the time and effort you put in these video’s. Oh, and also thank you for the free ’The Vacuum Tube Shortwave Radio' E-Book I just discovered! Now I can watch one of your video’s, and then read, and than watch another video, and then read some more,…
Thank you for your personal reaction Richard, much appreciated. I can only hope you have as much pleasure making your video's than all we viewers have when watching them.
I received a 5r10 hallicrafters and it is on as soon as it plugs in. The volume has an off but doesnt work, unless it clicks off hard? The powercord comes in with both lead going right to the first tube.- No switch. Also the r19 220 ohm 1w resistor is half broke and reads 120 ohm now. The tuning cord was routed wrong and had to be cut. I ended up just going from knob to pulley above it and it works! I left the back open to look at the variable cap to get an idea where in the frequency I am. Eventually I plan to fix the tuning cord & needle, atleast replace the broken resistor and put a polarized plugged cord on.
I have an RCA RC-1061,started to re tube and recap this radio. In over my head with it. Can I ship it to you for repair? ad5kd at alpha tango tango period November echo tango
Thanks jim maddog If C-17 opened the audio would have a high pitch to it, possibly generating noise. If C-17 shorted the audio output would be greatly reduced and possibly damage the 50L6 and the audio transformer.
This is an extremely nice video. I couldnt understand one thing, though. What is the job of C17 and why he takes a middle tap from the primary of C3 when he connects in the power supply. Anyways, thanks for the very informative video. Actu
I have colored the section of each tube and labeled it's function. If you send me an email I'll send it to you, Make the subject Philips BX373A. allamericanfiveradio@yahoo.com
Really good explanations regarding the signal path and everything else within the radio. Thank you. Have subscribed. Just a beginner here trying to learn some radio basics. I have a question however, regarding the last part of the video (the Automatic gain control path via the R5). Why is it also tied to the Oscillator coil (B terminal) ? What does it do. ? Isn't that a somehow a typo on the drawing? Or. would that be a way to reduce the oscillators 455KHz level and in turn further reducing the overall amplification (in the event of a strong station ? Thank you.
R5 supplies the DCV stored by C8 for the ALC. It is common that a component has more than one function. C8 stores the ALC voltage, it isolates the OSC secondary from DC ground, and is the RF path for the OSC secondary to ground. I will do a video on this soon. Here are a few videos you many find helpful. How Superheterodyne Works czcams.com/video/jQd2LfTOa4k/video.html !923 Vacuum Tube, Amplitude Modulation Detector Circuit in Detail czcams.com/video/e0faax3Svgw/video.html MY FREE EBOOK Password is allamericanfiveradio czcams.com/users/redirect?event=channel_description&redir_token=QUFFLUhqa2hhVTRycWdJd1FUbTFCZWNmdGtQNlZCRmEzd3xBQ3Jtc0tuOFQ2bFhRcWdjdUdIcUREcnZFaHc0M2xURGhITVRuWDE2cGlDakdYUF9uODktNzc3TVRJTWdROUt6R3NLN2lla3hFS2lIM0RnOXR1dXFxMGx2cUNtWDhXb1Zvc2RCbGQxTThoendmN2E5R0lJdmI0Yw&q=https%3A%2F%2Fdrive.google.com%2Ffile%2Fd%2F1HHmaWYr7UMACfmS4W5uL6PADoem2KlRp%2Fview%3Fusp%3Dsharing
Thanks for this video Richard. I refer to it often. Can you tell me the purpose of the plate on pin #5 on the 12SQ7? I don't seem to get it cleared up in my mind. Everything else that you covered in good.
Pin#5 Plate and the Cathode are a Diode. This diode cuts the modulated RF in half so that the AM signal can be amplified. (AM Detection) This video may help you understand this process. If you have questions, let me know. How Superheterodyne Works czcams.com/video/jQd2LfTOa4k/video.html
Hi Richard. May I add a link to this video in one of my videos? This is such a great explanation of the AA5 I'd like to send viewers here if they would like to get a firm understanding of the AA5... -John
I've been away from electronics since the late 80s. At 65 I got my ham liscence and been on a relearning curve for last three years. Thanks for this and other videos which finally give me a ahaaa moment . Your succinct explaination in a short video gelled so much info. Appreciated in this over the hill brain.
Thanks and your welcome.
Thank you Rick, for such a basic walk-thru. It really pulls together so many things for me. This video is terrific, outstanding, really. You have really raised the bar with this recent graphic. I very much appreciate the time you put into these videos.
Thankyou for being a great mentor and teacher to us out here that are trying to learn. You do so much to help us understand.Great video,I just fixed my first radio ,a bad .02 cap leaking badly to ground on an old Hallicrafters s40a ham set.cut it loose and the old girl came to life with a new 1000 ohm resistor installed that was toast.
Thanks
Beautiful video how the radio signal goes through all the stages ,from the aerial to the loudspeaker and the AVC circuit very clearly explained how it works as well as the oscillator circuitry. The colouring of the path where the signals go through is simple wonderfully clear. Thanks for the very tutorial explanation and the clear lesson.
Thank you, and your welcome.
Thanks Rick for another great video. Watching your videos always seem to increase my understanding of topics I thought I knew. Thanks for re-educating an old HAM.
Your AM radio videos are the best I've viewed on CZcams! I have learned so much from you! Thank You and keep them coming!I also downloaded you PDF book Thanks!
Thanks
Extremely informative and thorough explanation. Thanks for taking all the time to put this together and providing the links.
Thanks
I realise that this is an old video,. but I have just come across it today.
Thank You for a very clear and concise explanation of the signal flow through a radio.
Your colouring of the signal path at the different stages makes everything very clear.
Thanks
Totally awesome video Rick.... Your patience and expert teaching style have helped me to understand AA5 and other radios so well. It's really humbling trying to find the words to thank you for carrying this knowledge forward.....
Thanks again Rick. Once again just a fantastic presentation.
Thanks very much for getting back, I really appreciated it. This Astor BPJ I was working on was a customer repair, I have been doing this for nearly 5 years and have fixed all the sets I have worked on, probably about 40/50 or so and this fault was really doing my head in as he bought it on Ebay “working” and it had a few loose joints a broken leg of a new cap and a O.C resistor. I have been looking at this for weeks and trying different things, then yesterday the way you broke up this video in stages made me think if I connected some headphones to the input of the power tube after c15 in you schematic that may narrow down the fault which it did. So You did help me. So Thanks again.. Great video
Thanks
This video may help also.
Build a Audio and RF Signal Tracer using a Guitar Amplifier
czcams.com/video/QUmPBBnzkRE/video.html
Rick,
Thanks so much for showing, with your highlighted schematic, how an AA5 operates. I knew the basics, but your video shows all the details. The good news is that I can re-watch your video as often as necessary until it sinks in and takes hold.
Regards, Tom
That was a really great video!
I've studied electronics and I got my diploma as a technician, but the course was really short (2 years) so we didn't have time to go too deeply into stuff like that.
Now I understand how a radio works. That's really cool!
Really nice work Richard!! I particularly like the way you explained about the effective zero output of audio (signal cancelling out) if you tried to sample signal before it goes through the detector. Crucial information explained well. That was great fun to watch!
Thank you.
This is what I've been searching for, Rick. Thanks so much for posting it...
Fantastic video! Thanks. Nice refresher for me. BTW in describing the first IF you said the frequency that will be used was 455kc and 455Hz. Just wanted to mention that. Thanks for all your hard work
Great video! I love the simplicity of the AA5.
Thanks
Thanks to you Rick. I'm finally getting it. I have found your videos extremely helpful. I've bought an old Grundig 5077 that needs work and I've been trying to do this myself. I'm a mechanical Engineer and so far my understanding has not been sufficient to do this. The radio has got Hum when you up the volume, Has poor FM reception and the volume periodically changes on its own. It has had most of the Caps changed (by the previous owner) but not all. I was finding the circuit very complex and difficult to follow but slowly with your tutorials it is coming into view. Very grateful to you for your clear and concise videos.
Thank you, and your welcome.
I think my FREE eBook may help.
PASSWORD is allamericanfiveradio
drive.google.com/file/d/1HHmaWYr7UMACfmS4W5uL6PADoem2KlRp/view?usp=sharing
@@AllAmericanFiveRadio Thank you Richard. This is absolutely brilliant. You are most kind.
@@aspendesign Thank you, and your welcome.
Thanks Philip Booth,
R13 and R14 are biasing resistors. R14 races the voltage of the cathode 5.2V above ground, R13 sets the bias voltage at pin five for the control grid.
Thanks so much Richard... This is the best video on this aspect of radio that I have ever seen. This really helps to clear things up for me. Thanks for the downloads too.
Your welcome and Thanks
@@AllAmericanFiveRadio Sadly, links are now broken.
Very good explanation! I feel like someone just told me the secret to a magic trick that I've not been able to figure out. Understanding is a beautiful thing! You are an awesome teacher. Keep up the good work.
This may be a primitive design by today's standards however; you have to admire the brilliance of the engineers who designed it. Great video!
You may like this 100 year old circuit.
!923 Vacuum Tube, Amplitude Modulation Detector Circuit in Detail
czcams.com/video/e0faax3Svgw/video.html
Thanks for the demonstration, very well put together.
Thanks
Wow Rick!
I have been in electronics, professionally since the 70's and have NEVER seen a more definitive and clear presentation of how the signal flow in a radio schematic works in all my life.
Bravo!
If some day you could do the same for a vintage CRT based TV. This would also be absolutely fantastic.
Excellent job! The pinnacle of demonstrations.
Thanks for your generosity.
Thanks
Pin five, a plate, and pin three, the cathode, is a rectifier. It cuts the signal in half. The 155 pF capacitor drains off most of the 455 kHz signal and blocks the audio. The audio then travels down to the high side of the volume control.
Thanks Joe Minor
Yes, I put a note in the video and I corrected the downloadable file.
Rick, Your explanations for amplifier stage phase inversion, and detection are very clear. Much better than any textbook I have read besides yours of course. I have two questions. 1. When and how is the other detector plate pin 4 of the 12SQ7 used? 2. Is a vacuum tube detector more efficient than the galena crystal or say the 1N34A diodes used in crystal radio circuits?
Thanks Rick for this awesome video. I am trying to restore an old Hallicrafters S-38E which I believe is an AA5, just using a slightly different set of tubes. I appreciate all the effort to highlight the parts of the circuit as you were addressing them. This must have been a good bit of work but it makes your explanation very clear. Kind of funny, I just purchased a book about the AA5's on Amazon that appears to have been authored by you! Can't wait to get it! Thanks again. -rod (K1ROD)
Hi Rick, 13:06 running time but I know it took many hours in the making. I hope your work stays on CZcams for many years as I'm sure your efforts will go a long way to help folk in preserving some lovely old radios that would otherwise bite the dust through lack of understanding. A very useful description in 13 minutes well done!
Kind Regards ... Andy
Very good, thank you for posting.
Thank you, and your welcome.
Wow!!!! Old upload but so so informative. Thank you for the clear and concise explanation.
Thanks, age does not mater. The truth is the truth.
Ain't was a very tuition way of explaining step by step the path of the signal from the aerial input to the loudspeaker including the circuit for the AVC according to the strength of the received signal . Thank you very much indeed. I think you should print a book accordingly , it would be a bestseller for the electronics basics.
Thanks Cosmos142857
Yes, the flow for a basic transistor AA5 is the same.
Thanks Joe Allen
Thanks Tony T.
Excellent video! Great analysis!
Thanks
This was much better than just good. Many thanks, I learned a lot.
Your welcome.
Thanks GeoN0JRJ
You're welcome to use this video for your ham club, I hope it helps the members to understand superheterodyne receiver's. The two links to the drawings I made to fit on an 8.5 x 11 sheet of paper. Hope this helps,
Rick
Thanks John Richter
Thanks Douglas Tees
I thought I sent a reply but I can't find it, must be another CZcams improvement. In the circuit the vacuum tube would work better because it matches the impedance of the IF secondary. Generally, solid-state is more efficient but it is low impedance.
Beautiful! Thank you for this video. I have so much difficulty following these more complicated circuits and these 'signal trace' videos are very helpful and very much appreciated. I suppose the tube could be replaced with transistors?????
Thanks sahhaf1234
Mostly want C-17 does, is it attenuates the high audio frequencies a little.
excellent video, learned quite a bit on how superhet radio's work
Wow that was great , it was a very clear and easy to follow explanation . Thank you.
Thanks
Thank you for sharing this knowledge. Marvelous!
THANK YOU!
great explaination of the signal flows. thank you
Thanks and your welcome.
Great video... love circuit walk throughs
@allamericanfiveradio I have an AA5 I just purchased in good condition works well and I assume the bulbs are still good. My only problem is that it only picks up one station and faintly picks up another. What can I do to help pick up more stations?
excellent work
Thank you.
Fantastic, fantastic video. It clarified a lot for me; albeit I'm late to the party! I just need to clarify for my self the AVC. If it reduces the negative to the grids, I thought that would lower the plate current!. I'll do more reading.
Thank you , and your welcome. Here are two videos that may help.
Automatic Volume Level Control AVC ALC
czcams.com/video/NUerOOaKFP8/video.html
Superheterodyne AA5 from End to End
czcams.com/video/glakoNN4lwA/video.html
@@AllAmericanFiveRadio Thank you
Rick great video I,ve been interested in tubes for a while and found your vid very informative.
I got a late model AA5 a few years ago with the intention of re capping it as it has a very bad Hum.now i'm going to get to it this week.BTW i have a question what would happen if C17 was either shorted or open in the circuit? I have another radio which has one that is split open end from end and i get no sound at all just a slight whistling noise as i rotate the volume control>Thanks.jim
Thanks for a really detailed explanation, I guess I could troubleshoot an AA5 now without much trouble thanks to you, also helped with all valve radio troubleshooting.....................Ray H. ( from the U.K. ) Liked and subscribed.
Thank you.
Thanks, I can understand the way you presented it. Lot of info
Thank you, and you may like this video also.
Superheterodyne RF Mixer Visual Color Demonstration
czcams.com/video/OgU5aAzjR-k/video.html
Thanks Ron Pearson
Another great video Rick. I hope you ment 455 kilo Hertz in stead of 455 Hertz for the IF frequency Or for older terms 455 kilo cycles / second.
Joe
Well done. Congratulations!
Thank you.
Your videos are really nice!
Thanks
Thanks Andy
Thanks Philip Booth
Very nice and simpley stated. Thank you.
That was the first, really clear explanation of signal flow I've encountered since I began playing with radios 50 years ago (Yikes, did I really say that? 50 years, phew.)
Thank you Sir, i'm still learning the basics and this is very helpful. I don't completely get it but i'm starting to :)
Thank you. These videos may help.
Superheterodyne AA5 from End to End
czcams.com/video/glakoNN4lwA/video.html
Superheterodyne RF Mixer Visual Color Demonstration
czcams.com/video/OgU5aAzjR-k/video.html
Superheterodyne Radio, heterodyning frequencies together, how it works
czcams.com/video/5F-iKiltesU/video.html
Richard,
When identifying the AVC/AGC line in any radio schematic, is there a surefire schematic landmark to go to first, for someone new, in finding/tracking it?
Thank you very much , good explanation of the signal flow
THANKS
Thanks vibra64
Yes I put a note in the video and corrected the drawing
Thanks AntiqueRadioandTV
very good very good very good .. best educational video i have ever seen
Thanks
Great video!
Thanks I hope this video helps.
I found the video very informative. I recap old shortwave receivers once in a while, and struggle with the flow of the schematics. Soon, I plan to recap a Zenith 6G601. 73 Paul AA1SU
THANK YOU!
Great explanation and very helpful.
Excellent lesson.
Thank you, and your welcome.
If the question is: for what purpose do you use the internet most of the time? Then watching, enjoying and learning from CZcams channels like
AllAmericanFiveRadio would definitely be in my top 3! I can’t thank you enough for all the time and effort you put in these video’s. Oh, and also thank you for the free ’The Vacuum Tube Shortwave Radio' E-Book I just discovered! Now I can watch one of your video’s, and then read, and than watch another video, and then read some more,…
Thanks you Patrick. I'm glad that you find my CZcams site useful. When I started my CZcams I was wondering if any body would be interested.
Thank you for your personal reaction Richard, much appreciated. I can only hope you have as much pleasure making your video's than all we viewers have when watching them.
I received a 5r10 hallicrafters and it is on as soon as it plugs in. The volume has an off but doesnt work, unless it clicks off hard?
The powercord comes in with both lead going right to the first tube.- No switch.
Also the r19 220 ohm 1w resistor is half broke and reads 120 ohm now.
The tuning cord was routed wrong and had to be cut.
I ended up just going from knob to pulley above it and it works! I left the back open to look at the variable cap to get an idea where in the frequency I am.
Eventually I plan to fix the tuning cord & needle, atleast replace the broken resistor and put a polarized plugged cord on.
I hope you can continue with the restoration, back to 100%.
Thanks for the great info.....
Thank you and your welcome.
Thank you , that was a very informative video.
Thank you.
Sorry, in my last message C3 must be T3 (ie, the transformer) and the last word "Actu" must not be there.
Thanks again,
I have an RCA RC-1061,started to re tube and recap this radio.
In over my head with it.
Can I ship it to you for repair?
ad5kd at alpha tango tango period November echo tango
Thanks jim maddog
If C-17 opened the audio would have a high pitch to it, possibly generating noise. If C-17 shorted the audio output would be greatly reduced and possibly damage the 50L6 and the audio transformer.
Thanks skycarl
Great lesson, Thank You!
Thanks you Boss. I will try this on my equipment schematics
Thank you, and your welcome.
This is an extremely nice video. I couldnt understand one thing, though. What is the job of C17 and why he takes a middle tap from the primary of C3 when he connects in the power supply.
Anyways, thanks for the very informative video.
Actu
Thank you!
Thank you, thank you, thank you, for this fine explanation.
Van you do this also in a BX373a?
I have colored the section of each tube and labeled it's function. If you send me an email I'll send it to you, Make the subject Philips BX373A. allamericanfiveradio@yahoo.com
Really good explanations regarding the signal path and everything else within the radio. Thank you. Have subscribed. Just a beginner here trying to learn some radio basics. I have a question however, regarding the last part of the video (the Automatic gain control path via the R5). Why is it also tied to the Oscillator coil (B terminal) ? What does it do. ? Isn't that a somehow a typo on the drawing? Or. would that be a way to reduce the oscillators 455KHz level and in turn further reducing the overall amplification (in the event of a strong station ? Thank you.
R5 supplies the DCV stored by C8 for the ALC. It is common that a component has more than one function. C8 stores the ALC voltage, it isolates the OSC secondary from DC ground, and is the RF path for the OSC secondary to ground. I will do a video on this soon.
Here are a few videos you many find helpful.
How Superheterodyne Works
czcams.com/video/jQd2LfTOa4k/video.html
!923 Vacuum Tube, Amplitude Modulation Detector Circuit in Detail
czcams.com/video/e0faax3Svgw/video.html
MY FREE EBOOK
Password is allamericanfiveradio
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thank you.
Thank you, and your welcome.
Wonderful explanation. Thanks.
Thanks
Thanks for this video Richard. I refer to it often. Can you tell me the purpose of the plate on pin #5 on the 12SQ7? I don't seem to get it cleared up in my mind. Everything else that you covered in good.
Pin#5 Plate and the Cathode are a Diode. This diode cuts the modulated RF in half so that the AM signal can be amplified. (AM Detection) This video may help you understand this process. If you have questions, let me know.
How Superheterodyne Works
czcams.com/video/jQd2LfTOa4k/video.html
Thanks Richard. I finally got some time to look at that video. I appreciste all your work over the years.@@AllAmericanFiveRadio
Thanks blackcorvo
Thanks for sharing!
Thank you.
Muy bien explicado su video acerca del funcionamiento del receptor superheterodino, muchas gracias. CE1GWX, 73.
Thank you, and your welcome.
Brilliant! Many thanks from a novice.
Lynton
Thanks
Hi Richard. May I add a link to this video in one of my videos? This is such a great explanation of the AA5 I'd like to send viewers here if they would like to get a firm understanding of the AA5... -John
John Richter
John RichterSure you can link to this video. I'm glad you like it.Rick
Thanks iorixs
Thanks saturn5tony
Do you have any videos that explain some of these circuits individually? I am having trouble understanding.
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love the videos
Thank you, and your welcome. You may like this.
How Superheterodyne Works
czcams.com/video/jQd2LfTOa4k/video.html
Great video Ric, it's much easier to see on video compared to reading many pages
in a book. This will help many people learn much faster.
Can you use a 455khz crystal where the first IF can is to do the same thing..???
455kHz crystal filter.