For the life of me, I never thought about using the noise function to find SMD. I've used it for noisy transistors and resistors.. duh.. this is a perfect application for that function. I'll try to remember that next time. Im sure you've seen Shango use night vision goggles to actually see the arcing going on. Just not everyone has night vision goggles laying around, but I have 3 signal tracers! Thanks for the tip, Sam!
So, basically you're looking for leakage between the primary and secondary. I remember doing something like that when I worked for the DoD checking sonar cables with a Megger.
The radio that I'm working on now has SMD and I used a low voltage leaky capacitor checker and a high voltage leaky capacitor checker, and both will conduct across the primary to the secondary of the IF showing SMD. Really cool. On the ohmmeter shows open.
I bought a 2022 Marshall 50 watt JVM amplifier for my guitar. And that's almost exactly the sound I was getting out of the amp when I turned it on after letting it sit for about a year. It took the engineer five weeks to figure out that it wasn't a tube or a resistor but a silver Micah capacitor that went bad. From what I've read those capacitors should last at least 10 years. Why the thing went out I don't know. In the 3 years that I had the amp it was hardly played. But now that the silver Mica capacitor has been replaced the amp sounds like brand new. The noise was so bad it sounded like 15 rabid raccoons fighting with a badger. 🙏😃🕊️❤️ That signal tracer looks like a good investment
I suspect the noise in my s38e may be caused by morethan bad mica but due to dirty power in the new, poorly sheiled wire. On the other hand, the volume is very poor.
For sets that don’t show the IF cap values, would it be possible to find the value by applying 455khz and trying different value caps to find the sharpest resonant peak? Once the micas have been removed of course..
Thats one way to do it. This transformer performed perfect back in its habitat, but the 2nd transformer was a bit of a pain. I didn't show that one being reworked.
Why can't the raccoons stop fighting. Whatever happened to the brotherly love amongst raccoons. What happens is, they start fighting and the whole damn amplifier falls apart. 🙏🕊️❤️
For the life of me, I never thought about using the noise function to find SMD. I've used it for noisy transistors and resistors.. duh.. this is a perfect application for that function. I'll try to remember that next time. Im sure you've seen Shango use night vision goggles to actually see the arcing going on. Just not everyone has night vision goggles laying around, but I have 3 signal tracers! Thanks for the tip, Sam!
Your Welcome!
...I have seen those Shango66 videos too...
I like the description about it sounding like raccoons fighting for potato chips.
Thanks, I have the exact same signal tracer and never knew what the noise function was for.
Thanks for sharing that great tip.
So, basically you're looking for leakage between the primary and secondary. I remember doing something like that when I worked for the DoD checking sonar cables with a Megger.
The radio that I'm working on now has SMD and I used a low voltage leaky capacitor checker and a high voltage leaky capacitor checker, and both will conduct across the primary to the secondary of the IF showing SMD. Really cool. On the ohmmeter shows open.
Great video Sam.
I bought a 2022 Marshall 50 watt JVM amplifier for my guitar.
And that's almost exactly the sound I was getting out of the amp when I turned it on after letting it sit for about a year.
It took the engineer five weeks to figure out that it wasn't a tube or a resistor but a silver Micah capacitor that went bad.
From what I've read those capacitors should last at least 10 years. Why the thing went out I don't know. In the 3 years that I had the amp it was hardly played.
But now that the silver Mica capacitor has been replaced the amp sounds like brand new.
The noise was so bad it sounded like 15 rabid raccoons fighting with a badger. 🙏😃🕊️❤️
That signal tracer looks like a good investment
15 racoons fighting each other with a bag of potato chips. Suscribed!
...how is it connected to the IF transformer?
There's a coil in parallel with the capacitor...
I suspect the noise in my s38e may be caused by morethan bad mica but due to dirty power in the new, poorly sheiled wire. On the other hand, the volume is very poor.
Is this common in 30s, 40,s 50s radios? Or is it specific to a certain decade?
For sets that don’t show the IF cap values, would it be possible to find the value by applying 455khz and trying different value caps to find the sharpest resonant peak? Once the micas have been removed of course..
Thats one way to do it. This transformer performed perfect back in its habitat, but the 2nd transformer was a bit of a pain. I didn't show that one being reworked.
If the mica sheets can be removed from the IF transformer, can they somehow be cleaned to eliminate the noise?
You cut them out and replace with a real capacitor, I will be making a follow up video in regard to this which shows the procedure.
...it doesn't work that way-!
what exactly doesn't work that way?@@daleburrell6273
@@oldavguywholovesRCA he means you cant just take out the mica and clean that silver off the sheets.
do all the IF coils have silver mica on it, I have telefunken radio console, it is worth it to try to repair?
Not all of them, only the newer stuff from I guess the late to mid fifties on up.
I think my SX-71 suffers from that. The high band sounds like raccoons on LSD.
Is there a "medicine" for curing the disease?
There is but nobodies been able to figure out where the mouth is yet.
Why can't the raccoons stop fighting.
Whatever happened to the brotherly love amongst raccoons.
What happens is, they start fighting and the whole damn amplifier falls apart. 🙏🕊️❤️
wow