Tiny Radio Restoration With Detailed Procedure!

Dear Carlson,
The circuit is slightly different from the radio. The radio has oscillator coil and three IF stages. Where as the circuit is showing two IF stages. Total coil cane four in the radio, but in the circuit, only three coil cans.

Thanks praovd of you

Better to power it initially with a power supply so you can see and limit the current.
If nothing else, run the battery through a milliamp meter initially.
I recently watched a video where a competent tech used up a 9-volt battery in the time it took him to realize the two germanium transistors in the audio output stage of an old pocket radio were excessively leaky. Needless to say he wasn't happy about it. In a lot of cases a Procell battery is worth more than the radio. Dollar store 9-volt batteries work fine in these radios. One of the goals of restoration should be minimizing current draw. Challenge yourself to see how low you can make it. Think 5 milliamps for the simplest ones with a single IF stage.

Likewise if you started studying electronics in the early 80s, it was before hobbyists thought nothing about learning and designing SMD and multiple layer PCBs. Today you order your double sided PCB and it arrives in the mail, no problems, simple.

Merci, a great video.

Mr Carlsons lab do you no ware I can get Russian germanium transistors for my zenith Trans oceanic shortwave receiver I want to restore it 😂😂😂😂😂😂😢let me no

Тыкает куда попало не соображает не умеет чинить

😊NICE😊

I used to repair lots of these radios starting when I was a 12 year old. My Dad taught me from the age of 8 when he bought me a "Denshi Block" electronics kit for my Birthday. Brings back the memories! Many thanks indeed Mr Carlson.

Woooh!

Lol this radio 100% had to be a main inspiration for the design of the ‘60s Star Trek communicator!

Love watching this while i wrench on cars

I am reminded of the late John Prine who said of these little transistor radios, that, "They only made 60 million of them and I was lucky enough to get one."

Back in the day 465kHz was one of several IF frequencies before 455 became the standard. Nice work tho!!

Havana Syndrome noise?

Video language in hindi please

When I was a kid back in the mid 1960's I had a job working as a farm laborer for 5 bucks a day, room and board. I saved up my pennies and bought a brand spanking new JADE transistor radio, it was turquoise in color. Well i quickly wore out the 9 volt batteries on the set listening to the rock and roll at night out of Bismarck ND and Oklahoma City OK when the moon was just right. So after some time I decided that I usually listened to the set in my room and it really didn't need to be that portable, so I soldered on some wires and hooked it to a 6 volt lantern battery. I was having a hard time getting my favorite stations in, and so I began screwing those little colored screws back and forth, well by the time I got done with it, I no longer had an AM Radio, but instead was receiving short wave at night, during the day I was getting some of the local (for the USA) stations like the time out of Colorado Springs and VOA which was blasting 24/7 back then as well as radio Cuba for the communist folk in our nation. I took it up to the local DJ to look at, he thought it was cool and hooked it up, sort of, to the main antenna for the AM Radio Station, we were getting all sorts of things with her. Well a few years back, I cleaned mom's house out so we could sell it, as she went into the nursing home, where she still resides today at age 97 and counting. I found the old radio, mom had kept it after I left home and started my own family. Sadly, the old radio had no life left. in her no matter how much voltage I fed her, I tore her apart and used some of the parts on other old sets I have laying around. I think I still have the case somewhere.

Would an am radio react at all to a same freq fm signal, or vice versa?

There's no question you would be hard pushed to find anyone with the knowledge and experience of mr Carlson.

I am more than old enough to have bought these and aprt ffrom the novelty and cuteness of the size I found them noisy and troublesome, usually the tuning capacitors were a problem .

Hey Mr. C, your videos are really top notch. As a former electronics assembler and RF engineer, I really dig it. Cheers from NYC.

In the 1960s we all had this type of radio …./COOL ….IF YOU HAD EARPHONES GOODNESS, MADE US ALL PART DEAF 🇬🇧

With such a nice microphone, why is the audio so awful?

Shame you showed the circuit diagram but forgot to point out the failed capacitor causing the hooting !
I have looked at circuit and board layout, and I believe it's the 30uF decoupling between the negative rail that supplies the mixer osc, and first IF stages (via the 150 ohm resistor) and the positive ground rail. The cap can be seen on the circuit diagram about half way across, and in the lower half, right next to a 1k resistor.
If this capacitor went low in value, or had a very high esr, that supply rail could go unstable and allow the oscillator or IF to oscillate at almost random frequencies, as he showed on the scope.

Microprocessors these days have Billions of transistors, not millions.

Duracell!? Shango066 would most probably not approve. ;) Thanks for the great repair video.

You are brilliant , yours videos remind me my childhood. I have got the same kind of transistor radio.thank you to show us what are those harmonics because only to heard that from my father I haven t any practical idea what they are and made by , capacitors avoid a lot of disagreements when they are in good capacities.

I was very fond of transistors specially the smaller ones. I could buy one after many years.

When I was in junior high (late '60's) Your "coolness" was based on how many transistors you radio had. I think that I had nine so I was moderately cool. I contrast that with the 730 million'ish transistors on my Intel i7.

Thanks for all you do. I'm in the middle of my first transistor radio repair right now and I'm trying to watch as many videos as I can to soak up knowledge.

I like how you pronounce 'solder' correctly. 😀

Looks a bit like a Star Trek tos communicator 👍😁

Will changing to a modern same size speaker improve sound quality any meaningful?

Can you turn off PC before testing?)

That's a beautiful little radio

That was amazing. Thanks for the video

I thought they would have used three tiny wire ended Philips/Raytheon vacuum tubes and two batteries 1.5V one for the heaters and 45V for the B+ just wondering.

I remember when I was a kid having so many radios like this. And I was so interested in electronics of course I always took them apart to look at the insides.

Had a very similar radio 1960s , earphones were DODGY ,ALWAYS BAD RECEPTION, the good old days 🇬🇧

OMG awesome video, I wish I had the testing equipment you used, I'm saving up for a oscilloscope atm, but I've also done allot of research on the analyzer as well. Thankyou for the video

That's not tiny! Before Sinclair made computers, they made calculators, and before them, there was the Sinclair Micromatic radio. The size of a matchbox, and sold as a kit for £2 in 1970. I think it was the first thing I soldered together, before I moved on to crystal radio and then tube sets.

Usually it the power switch or volume potentiometer

Usually it the power switch or volume potentiometer

plot twist it was already working it was just set to dolphin mode

Excellent repair job, thanks for showing the whole procedure.
Congratulations..