Відео

I have a HP 8640B with no RF output. The Power meter light does not turn on. The unit turns on but no RF output and no counter output movement when the internal frequency dial is turned. The power supply LEDs are and no -5.2VDC. I removed the RF Divider Filter Assemble and the -5.2 VDC is correct. Can you please provide suggestions on what is drawing the voltage down to 0VDC? The rectifier boards and filter caps are good. Al

Thanks for sharing ❤. Take care from India 🇮🇳

Lov it. Antenna 📡

Give me this book pdf sir

Thanks for sharing. ..Take care from India 🇮🇳

Nice!

Germainum vs silicon 😊

They havent changed much...i have a eye for the Chinese kits. Assemble them and show them off :::check old computers for a passable speaker. Ps if you heare a" putt" then the final amp is getting some power😊

Maybe, but The person did live.

Too many burgers?

Wow, quite interesting! I wonder how long and far they can fly

What station was this on, and was it day or night?

I had that radio in turquoise with a real leather case. It took Sears batteries.

Thanks for this

Hi Frank , what about to 3D print one with the „separator rips.

Your video production is much improved, and your dry humour

14:04...actually, no: if you're tuning in 1600kc signal, and expect to get an IF signal of 455kc, the local oscillator will have to produce a 2055kc output signal...

So you basically can listen to hams in the 80 to 40 meter band on that? That’s really good for a radio build by a kid lol.

You should add a cooling fan to it to, I bet it would perform even better than when you first built it. Do an upgrade if you would in other words.

Install some new electrolytic caps, and that buzz might just disappear. Would be cool for me to build something like that but I’d add an lcd display to be able to see what frequency the radio was tuned to too.

They built radios in shop? Damn, I wish where I went to school they did that. Man I could have had myself a communications receiver from heaven. I’m a general class ham and I enjoy listening to HF and shortwave radio. So that would have been something I would have wanted to do as a kid.

It is NEVER a good idea to put new electrolytic capacitors in parallel with old ones. When they age, electrolytic capacitors basically turn into resistors of uncertain value until they ultimately short. When this happens, they may damage other components (such as the rectifier tube). You will also get rid of the remaining hum if you remove the old caps. Hope this helps.

why is the video so SHITTY??

Much easier when you were 13. Lol I just turned 50 and don't have nearly the patience I did when I was younger. I still have alot of the projects I made when I was in my teens.

Unless there is a tuned RF stage 6 transistors was all that was needed. Back in the day there were companies that touted ridiculous numbers of transistors in their sets (A North American brand pocket radio with 15 transistors for example). They just put a lot of fake shorted transistors and some connected as diodes. The actual active transistors in that set was five! (Mixer, one IF and 3 audio).

We built these kits when I was in high school electronics class.

I still have my Graymark 510, 5 tube superhet, that I made in High School in 73. It still works and I've never done anything to it.

Very impressive for a school shop built radio - 50 years old. Clearly, your shop classes were more advanced than my simple soldering of diodes onto a board.

Where did you get the schematics? Any chance you could share them somehow?

Hmmm. I wonder if that would work on the 2-legged rodents seen around my property?

Clever. We will all be eager to hear of your results. I hope it works. It occurs to me that you might not be able to use the device, before the flowers have been pollinated, because the agitating sound will not discriminate between beneficial and non-beneficial species. You won't much know if pollination has occurred, until you see that the fruit has set, I guess. Cheers!

Please more light to see everything.

Nice repair! Now you can listen to Metallica, ACDC, Judas Priest.......Your favorite musicians?

Zenith was good about making electronics that were service friendly. I always liked the fact they used sockets. Made to last!!! I did notice the crack on the board earlier in the video, but I've had many years dealing with electronics servicing and most people would have missed this.

This video had zero likes and comments. I just had to fix that! ;-) The Four Freshmen were a major influence on Brian Wilson of The Beach Boys.

The audio circuit with the dual secondary driver transformer and transformerless output was quite commonly used in high fidelity amplifiers as well during the germanium transistor era.

Enjoyed the journey on this repair. Very interesting result & sounds like a top radio. Great video ! Cheers 🙂

A Great Video thanks so much for taking the time and effort to publish. I just picked up this exact same model at a our local HAM Fest this past weekend. The plan to re-Cap is already in the works. The case is in wonderful shape for its age. This should be a wonderful radio when we (step dad and I) are through with the project. Thanks Again!

These comments refer to the Silverstone 1959 video of fitting and making a23 battery holder.

A very interesting video.I thought you might like to know I have the mint green 1202 version with a different PCB version 48307-7 which has the black paper with battery markings but has which I believe to be original,battery snaps for a PP3 9v battery which fits nicely with a small piece of original foam on the back to retain it (perished long ago) Best regards. Ian Reeve in the UK.

My favorite place

Where's all the Mopars?

Great pics and tunes

To run these cars is 1 dollar a minute rather than Volkswagen or Morris Minor.

Waiting for next video ,pump up volume

Great job, Frank! With the old transistor radios that have zero sound, first thing I always check is the earphone jack. 90% of the time, someone shoved the wrong plug in them and bent the cutout switch. Or the switch terminals are corroded. Did you check the voice coil wires behind the terminal board on the old speaker. Some times those are broken and, if you are careful enough, can be repaired.

Nice Job! Tune into some 'Judas Priest' and turn it up loud.

😀😀😀😀

I have 2 1960 models It had bad capacitors. One of the electrolytic capacitors i had a difficult time removing it. I unsoldered both legs but could not pry it out..turns out it has 3 legs.

More details please on the technical repair Frank