I just got a Technics SA-5470 that i am working on. I have some videos of it on my channel also the left channel has some static in it can you tell me what to do to fix it? it does not do it when you adjust the volume. and after about an hour the right channel starts to fade
Great video! I started working on tv's and radios when I was a kid. I was teaching myself at that time through trail and error. I got shocked quite a few times. When ever a fuse would blow in the fuse panel my Dad would come to my room to see if I was still alive. LOL Thank you for sharing. Rich (ncautoman57)
Hi, They are no worse than working on any other tube set, there is more danger in the 450 volt B+ on an organ amp or guitar amp then the 6000 volts of a 7" electrostatic tv.
The current is very low on the ultor of the CRT.
Not to say it is okay to stick your finger on it though.....Hee Hee
This looks almost exactly like my Motorola 7VT5 I got from eBay. However, I can't even get the plate supply to come up to the proper voltage. I checked the resistances in the ballast tube and they seem fine. I think the problem is the old paper electrolytics. The wiring is not very well insulated, nor is it very easy to replace parts in the chassis because everything is so tight. I'll start working on it when I have some time. Thanks for posting. Maybe I can ask you questions as I go.
I just got a Technics SA-5470 that i am working on. I have some videos of it on my channel also the left channel has some static in it can you tell me what to do to fix it? it does not do it when you adjust the volume. and after about an hour the right channel starts to fade
loves2rock247 2 years ago
I am not that good at solid state, but check the electrolytics, if the tops of them are rounded, replace them.
The crackling sound could be a bad resister, since the volume control has no effect it has to be after the volume control.
Look at the output stage for any bad caps.
As I said, I am not too good at transistor stuff.
But most solid state stuff problems are due to bad electrolytics.
Good luck on this project.
Bill
old64goat 2 years ago
Great video! I started working on tv's and radios when I was a kid. I was teaching myself at that time through trail and error. I got shocked quite a few times. When ever a fuse would blow in the fuse panel my Dad would come to my room to see if I was still alive. LOL Thank you for sharing. Rich (ncautoman57)
ncautoman57 2 years ago
Hi Rich, Thats how I learned by trial and error, I got a few shocks in my time.
Thanks for stopping by.
Bill
old64goat 2 years ago
I enjoy watching other people work on the TV's. I am afraid of them though, for obvious reasons!
Hammondlover2 3 years ago
Hi, They are no worse than working on any other tube set, there is more danger in the 450 volt B+ on an organ amp or guitar amp then the 6000 volts of a 7" electrostatic tv.
The current is very low on the ultor of the CRT.
Not to say it is okay to stick your finger on it though.....Hee Hee
Thanks for stopping by.
Bill
old64goat 3 years ago
Fun stuff! Good to see you in action in your shop. Thanks for posting it. Best wishes.
ka7cev 3 years ago
Hi Ka7cev, Well this video is not recent, I copied this off a tape I made in 2000.
Thanks for stopping by.
Bill
old64goat 3 years ago
Hi Bryan,
Make sure you replace ALL wax/paper caps and get rid of the selenium rectifiers if you have them.
Bill
old64goat 3 years ago
This looks almost exactly like my Motorola 7VT5 I got from eBay. However, I can't even get the plate supply to come up to the proper voltage. I checked the resistances in the ballast tube and they seem fine. I think the problem is the old paper electrolytics. The wiring is not very well insulated, nor is it very easy to replace parts in the chassis because everything is so tight. I'll start working on it when I have some time. Thanks for posting. Maybe I can ask you questions as I go.
Bryan
CameramanLink 3 years ago