Hello, I picked up an old Yamaha M-70 a while back and I JUST decided to clean it up and start replacing all the original electrolytics and old carbon resistors.
Before replacing ANYTHING, I plugged it in (using a mains light bulb tester). I used a 3 way bulb (25W; 60W; 100W).
When I powered it up, the lowest setting (25W) did not light whatsoever, The 60W was very dim and the 100W was a bit brighter! Then I turned the bulb (switch) in to the off position AND ran through the process again WITHOUT turning the amp off. This time, the first setting (25W) started off dim and progressively glowed brighter, the next setting (60W) was brighter yet and the final (100W) was Very bright.
I powered off the amp and repeated the process! The EXACT same thing happened.
Can someone PLEASE Explain what is happening?
why do the bulbs only glow slightly the first time through the sequence of wattages (25,60,100) and then actually light (and grow brighter) if I go through the process again WITHOUT POWERING OFF THE AMP?
Then, when I DO power off the amp, The bulbs lowest setting (25W) shows nothing???
I know that using a Light bulb tester is essential for plugging in any old electronics to check for possible problems BUT I would like to know what is actually happening in the process!
Thank you
Brock
Before replacing ANYTHING, I plugged it in (using a mains light bulb tester). I used a 3 way bulb (25W; 60W; 100W).
When I powered it up, the lowest setting (25W) did not light whatsoever, The 60W was very dim and the 100W was a bit brighter! Then I turned the bulb (switch) in to the off position AND ran through the process again WITHOUT turning the amp off. This time, the first setting (25W) started off dim and progressively glowed brighter, the next setting (60W) was brighter yet and the final (100W) was Very bright.
I powered off the amp and repeated the process! The EXACT same thing happened.
Can someone PLEASE Explain what is happening?
why do the bulbs only glow slightly the first time through the sequence of wattages (25,60,100) and then actually light (and grow brighter) if I go through the process again WITHOUT POWERING OFF THE AMP?
Then, when I DO power off the amp, The bulbs lowest setting (25W) shows nothing???
I know that using a Light bulb tester is essential for plugging in any old electronics to check for possible problems BUT I would like to know what is actually happening in the process!
Thank you
Brock