Restoration of an early 1970's Graymark 511 All Band Radio
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- Опубликовано: 7 фев 2025
- I had built this radio in shop class back in the early 70's and had a lot of fun with it until I got a better radio and put it aside. It had sat forgotten until I found it recently, a bit rusty and with parts missing. I thought it would be a fun nostalgia project to restore it and get it working again.
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.
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.
We built these kits when I was in high school electronics class.
...ARE YOU BRAGGING OR COMPLAINING...(?)
@@daleburrell6273 Neither
@@daleburrell6273 I think he's just making a statement.
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.
I acquired a few years ago an earlier version of the 510, still in its box. I was thinking of making a video about building the kit.
@@FranksPlace-jk7pj They are surprisingly good radios.
@@Strike_Raid They used high quality parts which can be proven by the fact that your radio is still listenable with it's original filter caps.
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.
@@edpaparo9916 Actually, I find I have more patience with this sort of thing now than when I was a kid. When I was a kid it was hard to focus on one thing for a week like making an hour long video. There were too many diversions, plus school. Now. No problem.
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.
@@sondrayork6317 Since the tubes are on the top of the chassis, they don't get too hot because they aren't enclosed.
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.
True, for a permanent restoration, the old ones should be removed.
@@FranksPlace-jk7pjTHE **EXTREMELY HIGH** RESOLUTION OF YOUR VIDEO ALMOST ROASTED MY SMART TV. I HAVE NEVER EVER SEEN SUCH DETAIL AND SHARPNESS IN A RUclips VIDEO UNTIL NOW; YOU MUST HAVE A 32K VIDEO CAMERA FOR YOUR VIDEOS.
**JESUS FUCKING CHRYSLER!!**
@@bellytripper-nh8oxSorry, I hope it didn't burn your pixels too much.
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.
@@sondrayork6317 Since the radio doesn't have an internal IF oscillator, there's no frequency to track. However, if you have an RF oscillator nearby with a digital readout, you can tune in a station, turn the oscillator to that same frequency and read it that way. I've been doing it that way and it works quite well.
That radio can be made smaller if Philips/Raytheon low voltage tubes can be used.
@@DAVIDGREGORYKERR You mean the old hearing aid tubes? Would make for an interesting project.
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.
Yes, regenerative radios are very sensitive.