开云体育

TR-7 PBT Restored

Craig W8CS All Messages By This Member #84446 Finally repaired my original TR-7 PBT board that I roasted the U1001 analog switch on. (Dieter was right!) Took about a month to get the IC via eBay/Asia.? ? Unsoldering that dude took about two hours to get all the little pins out after I surrendered and used the "Wedge" method of chopping it out and unsoldering the pins afterward. Still pretty rough on the circuit traces. Because of this I dug through the junk box and put in a 14 pin DIP socket instead of directly soldering the IC in.? ? I was very surprised that it came right up after I set the 13.695 VXCO. Boom. Not sure if there is a sweeter-sounding receiver when everything's dialed in.? ? Next up: 1) The "better all-band transmit mod", 2) grounding mod to eliminate 40m parasitic, and 3) Cinch-Jones plug and fan mod to remove 120V from unit.? ? Tip of the cap to you guys for helping me keep this relic on the air.? ? -- Craig/W8CS Greenville, SC
Jim Shorney All Messages By This Member #84450 Congrats! they ARE repairable. On Wed, 16 Apr 2025 18:17:21 -0700 "Craig W8CS via groups.io" <craig_severson@...> wrote: Finally repaired my original TR-7 PBT board that I roasted the U1001 analog switch on. (Dieter was right!) Took about a month to get the IC via eBay/Asia. -- 73 -Jim NU0C
Steve Wedge, W1ES/4 All Messages By This Member #84451 It’s always satisfying to bring these back from the dead! ?Congrats! Steve Wedge, W1ES Time flies like an arrow. Fruit flies like a banana. Sent from for iOS toggle quoted message Show quoted text On Thu, Apr 17, 2025 at 00:54, Jim Shorney via groups.io <jimNU0C@...> wrote: Congrats! they ARE repairable. On Wed, 16 Apr 2025 18:17:21 -0700 "Craig W8CS via groups.io" <craig_severson@...> wrote: > Finally repaired my original TR-7 PBT board that I roasted the U1001 analog switch on. (Dieter was right!) Took about a month to get the IC via eBay/Asia. -- 73 -Jim NU0C
Jim WA9Z All Messages By This Member #84453 Good job. There is no need to socket any IC's in the radio. They reduce reliability. The original old technology chips lasted 45 years.? Jim WA9Z ?
Dieter Horst All Messages By This Member #84460 开云体育 Congratulations Craig!! Glad my hint led you into the right direction! Like Jim said, they ARE repairable. In fact, there is very little in a TR7 that cannot be repaired. (Some effects can drive you nuts, though!!) My TR7 has been without mains inside for ages now. Maybe because the European 50 Hz makes an even more annoying hum in the receiver. And it saves the switch in the pot, too! Good luck with your further work. 73, Dieter DL5RDO Am 17.04.2025 um 03:17 schrieb Craig W8CS via groups.io: toggle quoted message Show quoted text Finally repaired my original TR-7 PBT board that I roasted the U1001 analog switch on. (Dieter was right!) Took about a month to get the IC via eBay/Asia.? ? Unsoldering that dude took about two hours to get all the little pins out after I surrendered and used the "Wedge" method of chopping it out and unsoldering the pins afterward. Still pretty rough on the circuit traces. Because of this I dug through the junk box and put in a 14 pin DIP socket instead of directly soldering the IC in.? ? I was very surprised that it came right up after I set the 13.695 VXCO. Boom. Not sure if there is a sweeter-sounding receiver when everything's dialed in.? ? Next up: 1) The "better all-band transmit mod", 2) grounding mod to eliminate 40m parasitic, and 3) Cinch-Jones plug and fan mod to remove 120V from unit.? ? Tip of the cap to you guys for helping me keep this relic on the air.? ? -- Craig/W8CS Greenville, SC
atlasstuff All Messages By This Member #84468 Craig, ? Interesting that you had trouble with that particular IC. So did I, on my low-SN TR-7. ? I replaced with a CD4066, as that's what I had to hand. The 4066 is a somewhat improved version of the 4016, as I recall. I put the replacement on a socket, just in case I ever have to go there again;-) ? Regards, ? Mark, G4FPH. ? ?
Craig W8CS All Messages By This Member #84469 Hi Mark, the IC was fine, it was ME that plugged in the small PS board one pin off...and roasted the IC that way. I would never have guessed/found that issue had Dieter not owned up to doing the same before me. I used the IC socket as well, as the board traces would probably not survive another unsoldering/replacement cycle.? -- Craig/W8CS Greenville, SC

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