I bought a Realistic Receiver from Radio Shack back in 1976 that had this touch-the-knob-to-tune feature. It was called "Auto Magic," and it was designed to automatically tune better than you could by hand. Julian Hirsch tested it and he couldn't manually tune the unit any better. I think that receiver is still bouncing around my family somewhere...
Thanks very much Tony! I've been struggling with the FM muting issue for a while, trying to figure out why I could only get 1 local station in stereo, using a roof top antenna, broadcast from 5 miles away. The muting blocks out all other stations, which come in great in mono mode. Using my 8656B signal generator, it will un-mute with a signal as low as 20 uV through a 50-75 ohm impedance matching L-network. For my setup, this is comparable to other FM tuners. However, it won't un-mute for anything but the strongest broadcast signal. Of course my generated signal is perfectly clean with no static, which is probably why it un-mutes. Thanks much, as I can now stop banging my head against the brick wall!
Great video! Also, it made me realize now that my Yamaha T500 is behaving in the same way. FM stereo also doesn't work when auto muting is enabled. And I almost always disable the muting because otherwise it just kicks in when the signal strength drops a bit too low. If I want my radio broadcast to drop out from time to time, I just listen to DAB. 😉
Hi, Tony, thanks for the videos! I fixed a CR2020, same thing. Muting circuit is the same BS. The receiver part is only "town". For "country", just grab a Pioneer 😁. I checked the output transistors. How about a beta of 3 on the npn transistors?
Since many of us can't afford all this high tech equipment; can you test some of the low cost eBay or Amazon knockoff equipment for alignments? Or can one piece of equipment do an alignment?
Hello! I'm sorry if I disturb you. I have a question. I have an amplifier, Fisher ca 2310. I want to change the capacitors in the power supply which are 2 pieces, which are double inside. Do I connect the capacitors in series on the channel? Thank you very much. A good day.
Gd day sir, I have a problem with my tek2445b, traces of channel 1 & 2 sometimes it goes up and down what could be the probem, what part of the instrument should I look into? Thank you sir
Hi Tony. I am pretty sure I saw you describe a cheap RF broadband amplifier to boost the signal from a rf signal generator so a frequency counter could read the frequency. I searched your videos and can not find it. I think you said it ran about $10.00. Could you tell me what was the name of your youtube video? Thank you.
Can I ask you something, I have a receiver that has great mw/LW signal and the tunning meter moves lovely but with FM I can only hear a station before and after the meter shows I am getting tuned into the station and as I get towards a decent signal I lose all volume? Now I've been playing with vintage radios and receivers for 20 years and never came across this so Any! Help coz I'm at a loss ??
Someone may have already been inside your unit and turned down the FM mute pot... I'm no pro, so all my units go to a person who does this for a living. You can save a lot of $ doing it yourself. You can also screw things up so bad it is unrecoverable or $ to fix makes the unit a give away.
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I bought a Realistic Receiver from Radio Shack back in 1976 that had this touch-the-knob-to-tune feature. It was called "Auto Magic," and it was designed to automatically tune better than you could by hand. Julian Hirsch tested it and he couldn't manually tune the unit any better. I think that receiver is still bouncing around my family somewhere...
Always the best audio equipment repair videos. Very informative.
That really is a great looking piece of kit. Thanks for the great work. 👍
Always good to hear that voice,
Thanks for sharing.
I agree with you, and I appreciate you paused the video to explain because it seems to vary to a service manual to another.
Excellent! Now if I could only find a Sencore 80.
Thanks very much Tony! I've been struggling with the FM muting issue for a while, trying to figure out why I could only get 1 local station in stereo, using a roof top antenna, broadcast from 5 miles away. The muting blocks out all other stations, which come in great in mono mode. Using my 8656B signal generator, it will un-mute with a signal as low as 20 uV through a 50-75 ohm impedance matching L-network. For my setup, this is comparable to other FM tuners. However, it won't un-mute for anything but the strongest broadcast signal. Of course my generated signal is perfectly clean with no static, which is probably why it un-mutes. Thanks much, as I can now stop banging my head against the brick wall!
Great video! Also, it made me realize now that my Yamaha T500 is behaving in the same way. FM stereo also doesn't work when auto muting is enabled. And I almost always disable the muting because otherwise it just kicks in when the signal strength drops a bit too low. If I want my radio broadcast to drop out from time to time, I just listen to DAB. 😉
Excelente Tony.
Good show Tony…. 👌
Great watching this series on the 820 Tony, do you have any videos showing the process of installing a new dial string?
Thank you 😊
Thanks Tony
Hello Tony.
I would love to see you refreshing a SACD player from the 2000s, the ones with multichannel analog outputs.
Thanks in advance.
Hi, Tony, thanks for the videos! I fixed a CR2020, same thing. Muting circuit is the same BS. The receiver part is only "town". For "country", just grab a Pioneer 😁. I checked the output transistors. How about a beta of 3 on the npn transistors?
Since many of us can't afford all this high tech equipment; can you test some of the low cost eBay or Amazon knockoff equipment for alignments?
Or can one piece of equipment do an alignment?
Hello! I'm sorry if I disturb you. I have a question. I have an amplifier, Fisher ca 2310. I want to change the capacitors in the power supply which are 2 pieces, which are double inside. Do I connect the capacitors in series on the channel? Thank you very much. A good day.
Gd day sir, I have a problem with my tek2445b, traces of channel 1 & 2 sometimes it goes up and down what could be the probem, what part of the instrument should I look into? Thank you sir
Hi Tony.
I am pretty sure I saw you describe a cheap RF broadband amplifier to boost the signal from a rf signal generator so a frequency counter could read the frequency. I searched your videos and can not find it. I think you said it ran about $10.00. Could you tell me what was the name of your youtube video? Thank you.
That cheap sh!t just ain't gonna fly. Sh!t can not and will not fly!
I would disable the auto-mute circuit
Can I ask you something, I have a receiver that has great mw/LW signal and the tunning meter moves lovely but with FM I can only hear a station before and after the meter shows I am getting tuned into the station and as I get towards a decent signal I lose all volume? Now I've been playing with vintage radios and receivers for 20 years and never came across this so Any! Help coz I'm at a loss ??
Someone may have already been inside your unit and turned down the FM mute pot... I'm no pro, so all my units go to a person who does this for a living. You can save a lot of $ doing it yourself. You can also screw things up so bad it is unrecoverable or $ to fix makes the unit a give away.
Might there be a way to modify the circuit so that disabling the auto mute does not disable stereo?
Of course, just look at the pins of the switch and insulate the stereo/mono part. Maybe I'm wrong, but check it.
Discriminators are NOT used in FM tuners! A ratio detector is used in FM tuners!
OK...Then where are discriminator circuits used?
@@xraytonyb they were used in early FM radios.