Awesome. I'm having a heck if a time figuring what is wrong with my old Cobra 18 Ultra Weatherband. Three-wire hookup for power - no matter how I hook it up, something fails to work (either led doesn't work or transmit meter doesn't work). While that one sits on the she!f, I am replacing some caps in an old tube cb. Having a lot of fun (so far) with that project.
Some thoughts on this . . . There was nothing wrong with the capacitor that was replaced in the video. Capacitance tolerance for that part is 20%. ESR was good. Replacement cap is a 105 degree part, of course that is good. Was the radio working fine? Thinking a lot of time and money was spent to not improve anything. Not all electrolytic caps in old gear needs to be replaced. Casual replacement exposes the PCB to needless damage and many collectors want all original. No sure how collectible that radio is. Johnson used good parts during manufacture. Just my opinion.
Normally I don't replace caps unless they need it for most of the reasons you cited. However, if you watched the whole video you'll see that one cap was leaking and if left alone would have ruined the board. I didn't show it in the video but several others were on the verge of leaking and benefited from being replaced. Without replacing all of them there would be no way to know which ones needed replacement and which didn't. Additionally, I wanted to make a video about how I go about doing this as I felt it would be something people would be interested in seeing. This isn't a 1970 numbers matching Hemi Challenger so I'm not too worried about keeping it original either. If replacing the caps devalues the radio down the road I'm OK with that at the expense of enjoying the process of extending the useable life of the radio and sharing the experience with others.
Very very informative and well done video. I happen to have one of those radios. The older I get the harder that is for me to do but I keep plugging along. Again very informative I joyed it very much
Its a component tester I got on Amazon - here is the link: amzn.to/3mZfwO0 There are a bunch of different versions on Amazon but I think they are all more or less the same thing.
Very nice job!! I have a Johnson Viking 4740 and want to do a full recap. Could you please give me a list of the used electrolytic capacitors? It would be very helpfull for me, thanks!
Sir, I need a little help. By the way, I'm from the Philippines & CB technicians here is scarse and I don't have much resources & high tech equiptment for repair so please bare with me. I've got an old never been used GE Model 3-5804B C.B. radio. It's got recieve, problem is that in transmit, the needle swings back instead of forward and there's a squeal if the volume is beyond 8 o'clock and no squeal below that volume level. I have another radio to monitor its transmit. I am kindly asking for your help what could be the problem and what should I do? Could it be the final transistor which is a C 1306. I'd really appreciate it very much sir.
You seem to be an expert at replacing electrolytic caps. The tech that used to work on my radios has passed away, and i'm looking for someone to re-cap a few of my mobile cb radios. Do you offer this service ? If so, i can ship the radios to you to have this done . Thanks
I have a kraco super deluxe 23 channel AM only radio that i had just replaced 2 old capps in the radios audio circuit only and the new caps was salvaged parts that still brought that old radio to life
Be careful with capacitors, I have seen some marked on the positive lead and not the negative lead, but as long as you take care, just check it is the normal - marked on the black strip on the capacitor. If it is a + it will go to positive on the board. Just take care and watch the markings.
Thank you for the video, I like to see how other people do this, and learn from them. It also helps to refresh my memory. So many things going on in the world right now to distract us. Stop in sometime for a coffee. Dirty Diaper 1 in S.C. OLd Radio Night
Thanks for sharing. I have some old AM and shortwave tube radios that I would like to restore but I need to get an isolation transformer and a variac before I feel safe to work on line voltage radios like these.
Now you are all set forthe next 40yrs having fun with this sneaky old cb radio. I recapped a JRC-NRD515 Receiver, a Uniden Madison, a Galaxy Saturn Turbo, a Galaxy Pluto II and my TS-850SAT. All the Radios I messed around with are fully in function & my signal reports confirming it over and over again that I did not ruin anything inside the Radios. Which can happen very fast but gladly in my case I did not.Thank god! In my opinion to replace the Electrolytic Capacitors of my NRD515 made this Thing sounding warmer to me. Thx for another neat Video 741, keep up the Wood Work in 2022 & stay healthy. Happy New Year to everyone & 73 de Your Friend Uncle Guenter
Round camshafts, used toilet paper, old capacitors. All work significantly better when new. You indeed covered the last very well! Refer to tic-toc for instructional videos on the first two... Well done sir! Have a great new year to you and your family!
I bought a Superstar 3900 from eBay last Christmas this was dated 1987, I keep making plans to recap it but can't find the time, I do know it needs a voltage regulator, the meter sticks and no transmit or receive, I think I can find all the caps and regulators in a lot bag that I have, I was one of those crazies buying all the stuff Radio Shack have while they were going out of business, nice job and again nice radio
Hi Rob, Happy New Year. I bought a recap kit for my Yaesu FT901DM. Hoping to get it dine in 2022. The new caps are generally smaller for the same capacitance. Your solder sucker with the bulb, you need to loosen the two screws holding the head assembly in and give it a little twist and then re-tighten the screws. Do the same at the tip and then re-tighten. There could be resistances built up at the attachment points preventing the tip from heating sufficiently. I have the same unit. Need to do something similar periodically to the tip of my soldering gun. You and the family have a safe New Year. 73 WJ3U
Sorry Bud but you are wrong. The quote below is from Wikipedia. If you don't trust that I can send you some datasheets for electrolytic capacitors I designed into circuit boards currently orbiting the earth on the international space station that depict Anode and Cathode terminal on capacitors. "An electrolytic capacitor is a polarized capacitor whose ANODE or positive plate is made of a metal that forms an insulating oxide layer through anodization. This oxide layer acts as the dielectric of the capacitor. A solid, liquid, or gel electrolyte covers the surface of this oxide layer, serving as the CATHODE or negative plate of the capacitor. Because of their very thin dielectric oxide layer and enlarged anode surface, electrolytic capacitors have a much higher capacitance-voltage (CV) product per unit volume than ceramic capacitors or film capacitors, and so can have large capacitance values. There are three families of electrolytic capacitor: aluminum electrolytic capacitors, tantalum electrolytic capacitors, and niobium electrolytic capacitors." en.wikipedia.org/wiki/Electrolytic_capacitor
@@SevenFortyOne Wrong? how long have you been in electronics? How many electronic engineers and technicians work for wikopedia? That language (anode /cathode) is for directional device diodes, scrs, transitors and the like. Ive been in the business for more than 50 years, nobody but nobody refers to a cap or battery polarity as having an anode or cathode. Polarity and direction are different. Polarity does not have a P/N junction or forward and reverse bias or turn on voltages. Stop reading technical manuals from manufacturers on the chemical makeup of caps unless your describing how to build one, especially for something as generic as recapping a radio. If you have to go to internet information sources to try to backup your opinion to make you sound knowledgeable then you dont know what your talking about. Just go recapp your radio and dont come back with the chemical make up of solder.
I've been in the industry over 30 years. I've worked for the largest PCB manufacturer in the USA, two fortune 100 aerospace companies and an industry leading EDA company in various roles related electronics manufacturing and design. Point is I've been around, worked in many capacities in this industry, and know what I'm talking about in this case. Your original assertion was that an electrolytic capacitor doesn't have a cathode and anode. It most certainly does. Do people always refer to them as such? Sometimes, yes, sometimes no...its not not consistent thought the industry but most places I've worked use those terms so I've gotten in the habit of doing so myself. If you meant that I shouldn't use the formal terms "cathode" and "anode" in my video and should instead refer to positive and negative terminals as that's easier for people to understand then I see your point and agree. If that's what you meant, that's what you should have said in the first place.
