Thank you! Wow! You did a marvelous job of explaining the many complexities of this radio. In addition to rehabilitating oone, there is another connection. My father in law was on the Princeton during the Korean War. He was assigned to the flag deck. When I showed him my old radio, he told me that they had several racks of these on that deck. Teletypes came in from all over the 7th fleet. If one malfunctioned, a replacement would be cut in quickly. I have compared this radio selectivity with a modern ham transceiver, and with enough futzing around, it's sensitivity and selectivity are comparable. I hunted down a couple of CW stations nearly on top of each other, and using the phasing control, I could isolate them. Sort of like the old method of determining visual acuity by looking at two close by stars and determining if they were one or two. And it doesn't drift. I'm delighted you presented this radio. It's an amazing design, and the construction is excellent. It deserves some credit too for working well at 66 years of age- that's how old mine is. I hope your presentation will leed to a greater appreciation of this piece of history.
It takes me back in time to the early 70s: the first receiver in our Army receiver repair course was an R390. They had a lot of small tubes (called "acorn tubes," maybe?). A beast!
This will be fun,... I have a Collins 51J in the basement. It awaits. I have never turned it on. Could an interesting first video for a new channel,...
Restoration of this receiver includes a lot of mechanical alignments. I strong;y suggest you tell the person who reached out to you to reach out to the AM Boatanchor guys on www.amfone.net Lots of good knowledge to be had.
I wonder what real world condition comparisons of it's sensitivity compared to modern radios would be like?
If you thing THIS is complicated, look at a Collins designed R-390.
Thank you! Wow! You did a marvelous job of explaining the many complexities of this radio. In addition to rehabilitating oone, there is another connection. My father in law was on the Princeton during the Korean War. He was assigned to the flag deck. When I showed him my old radio, he told me that they had several racks of these on that deck. Teletypes came in from all over the 7th fleet. If one malfunctioned, a replacement would be cut in quickly. I have compared this radio selectivity with a modern ham transceiver, and with enough futzing around, it's sensitivity and selectivity are comparable. I hunted down a couple of CW stations nearly on top of each other, and using the phasing control, I could isolate them. Sort of like the old method of determining visual acuity by looking at two close by stars and determining if they were one or two. And it doesn't drift. I'm delighted you presented this radio. It's an amazing design, and the construction is excellent. It deserves some credit too for working well at 66 years of age- that's how old mine is. I hope your presentation will leed to a greater appreciation of this piece of history.
I'm glad you enjoyed by video. It is truly a ingenious design. And, thank you for your gracious Patreon donation.
Incredible complexity, explains a lot about the high cost of these things then and now.
Wow thanks for this. I have seen many R390s at hamfests but never knew they contained an automatic transmission! 😁
It takes me back in time to the early 70s: the first receiver in our Army receiver repair course was an R390. They had a lot of small tubes (called "acorn tubes," maybe?). A beast!
@@rickwise9910 Nope. No Acorns in an R-390, just mostly 7 and 9 pin miniature tubes.
Thank you.
Thanks Sir for info, i got the original service manual for this radio, and i dare say it's rather complicate construction indeed.
This sort of explains the $450 "hammer" concept. But I should also add, enlightening on your part.
This will be fun,... I have a Collins 51J in the basement. It awaits. I have never turned it on.
Could an interesting first video for a new channel,...
Restoration of this receiver includes a lot of mechanical alignments. I strong;y suggest you tell the person who reached out to you to reach out to the AM Boatanchor guys on www.amfone.net Lots of good knowledge to be had.
Yes, indeed. This is NOT a "first project".