Great servicing video, well presented and very detailed. Reminds me of when I was working as an apprentice engineer in a radio and TV shop in the 70s. Customers would bring in their Roberts radio's for repair, as the Germanium transistors in the IF stage usually went faulty due to collector leakage to screen. I did the same thing, disconnecting the screen usually brought the set back to life. If that failed, the in went a new transistor.
@@techobaz55 Yes indeed Baz, it's nice to get back to some old basic radio technology for a change, like the single conversion Eddystone EC10. I have worked on double conversion receivers in the past, such as the Trio JR310 and Yaesu FRdx400. Thanks for your servicing tips, I shall be getting an old EC10 up and running again, your video has really helped in that respect, in what to look for, as well as alignment. A nice reminder! Cheers Baz, Matt
Yes you can, you lose about 1 in 3 to 1 in 4. OC171 is equivalent to the AF114, the physically smaller (TO72?) AF12X series do not suffer from the tin whiskers. I'm not sure about the American equivalnts.
Thanks Barry, I not familiar with dud Germaniums at all, never had this problem. Guess most of my early repairs in 60-70's were newer transistors & this didn't pop up. Going to try "Radiocrunchers" mod on zapping them ! Cheers
Those actual transistors grew whiskers there is a way to solve it by using a tape de magnetizer it will break the whiskers germanium transistors were well known for that
Once again beaut Video and very smart trouble shooting Baz - the Eddy lives again!!!
Thanks Derek, wasn't familiar with this problem but have learnt heaps from this repair.
Cheers Mate
Great servicing video, well presented and very detailed. Reminds me of when I was working as an apprentice engineer in a radio and TV shop in the 70s. Customers would bring in their Roberts radio's for repair, as the Germanium transistors in the IF stage usually went faulty due to collector leakage to screen. I did the same thing, disconnecting the screen usually brought the set back to life. If that failed, the in went a new transistor.
Glad you enjoyed the video Matt, certainly brings back the days of the AF116 etc & the OC Germaniums !
Cheers Mate, Baz
@@techobaz55 Yes indeed Baz, it's nice to get back to some old basic radio technology for a change, like the single conversion Eddystone EC10. I have worked on double conversion receivers in the past, such as the Trio JR310 and Yaesu FRdx400. Thanks for your servicing tips, I shall be getting an old EC10 up and running again, your video has really helped in that respect, in what to look for, as well as alignment. A nice reminder!
Cheers Baz, Matt
Thanks for the excellent trouble finding video.
Can you zap the bad transistors like you do to burn off the tin whiskers in bad af117 transistors?
Yes you can, you lose about 1 in 3 to 1 in 4. OC171 is equivalent to the AF114, the physically smaller (TO72?) AF12X series do not suffer from the tin whiskers. I'm not sure about the American equivalnts.
Thanks Steve, will give it a go & see if I can save any. Will do a short Vid on it !
Cheers
Thanks Barry, I not familiar with dud Germaniums at all, never had this problem. Guess most of my early repairs in 60-70's were newer transistors & this didn't pop up.
Going to try "Radiocrunchers" mod on zapping them !
Cheers
Well, you've nothing to lose as they are not working, and everything to gain.
Good luck.
Those actual transistors grew whiskers there is a way to solve it by using a tape de magnetizer it will break the whiskers germanium transistors were well known for that
Hi Jonathan, thanks so much for the tip on a demagnetizer, I will try that on a few I have here at present. Cheers 🍻