Very enjoyable video. I am glad that you showed the alignment. So many people skip this in there videos, but for a beginner it's an essential part of the restoration. Nice one.
Great repair and clean up. It looks and sounds good for it's age. My grandmother had one like it but the clock froze. That was back in the early 1980's . They did like their Zenith's.
Good solid troubleshooting PF. Nice showing the fault both ways on that IF transistor. . Those dome top transistors are known to be unreliable and often bad. My first thought was the GP transistor had different characteristics when you lost signal at normal voltage. Those GP transistors are often good for testing but once the problem is confirmed it's best to find a closer match. Of course your method of the repair being temporary unless it works is also acceptable. LOL Good little performer for what it is. :)
Thanks Jim. Oscillation feeding back through the AVC is my guess of what was happening. Interesting way to find the solution, the VOM lead. Thanks again.
Thanks. Yes, I agree; wish I could explain it. I was beginning to work on understanding what was going on with the bias voltages when discovering the capacitance would make it work.
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Nice work on engineering stability to the different IF transistor characteristics. Enjoyed watching
Very enjoyable video. I am glad that you showed the alignment. So many people skip this in there videos, but for a beginner it's an essential part of the restoration. Nice one.
Glad you enjoyed it. Thanks for the comment.
Great repair and clean up. It looks and sounds good for it's age. My grandmother had one like it but the clock froze. That
was back in the early 1980's . They did like their Zenith's.
Thanks Steve.
Good solid troubleshooting PF. Nice showing the fault both ways on that IF transistor. . Those dome top transistors are known to be unreliable and often bad. My first thought was the GP transistor had different characteristics when you lost signal at normal voltage. Those GP transistors are often good for testing but once the problem is confirmed it's best to find a closer match. Of course your method of the repair being temporary unless it works is also acceptable. LOL Good little performer for what it is. :)
Great troubleshooting video. The substitution transistor works very well, and it is interesting that the pF capacitor fixed the issue you were having.
Thanks Jim. Oscillation feeding back through the AVC is my guess of what was happening. Interesting way to find the solution, the VOM lead. Thanks again.
A very nice clock radio. It fought you a bit but you won.
Nice sleuthing there Holmes.
Thanks Jim. Enjoy your videos.
Nice TroubleShooting. I liked it.
But i dont understand how a higher voltage is the cause for the Oscillation?
Thanks. Yes, I agree; wish I could explain it. I was beginning to work on understanding what was going on with the bias voltages when discovering the capacitance would make it work.