I have an Yamaha DSP-A592 Amplifier took it from my fathers store room and it's work great after 18 years but the VFD Display is dim .is there any chance to fix it ? Please help me
Welcome to the forum, Steve.
Cleaning the display and glass does help.
It could be a supply issue, often caps, or, worst case a worn display.
Hugo
Cleaning the display and glass does help.
It could be a supply issue, often caps, or, worst case a worn display.
Hugo
It would also help to move his request to the right section of the forum. 😉👍
A great welcome from me too! 🙂
A great welcome from me too! 🙂
Thank you for your reply. But the display is okay and the filament also good glow in dark when I see it close up.
It can still be low emission from the filaments. As others have said, supply issues should be checked as this is a really common cause of dim displays. Often a capacitance voltage multiplier can be used to derive the high negative voltage needed and the caps go bad.
There are examples on the web of trying to rejuvenate VFD's when the filaments have gone low emission. How successful it is I can't say but theory is very sound in that you are attempting to burn of a layer of contamination on the filament to reveal a fresh emitting surface.
Well "worse" here often means "broken" since the filament can melt! Running the filament extra hot allows the surface contaimination to diffuse into the filament and or evaporate off its surface. If there's any "burning" then the tube is already dead as it should have a hard vacuum and a getter.