JJP transformers louder than others?

[johnh]

Hey folks

Have anyone noticed that their JJP transformers are much noiser than Stern or Spooky transformers (and perhaps others). I've noticed that my GnR and Wonka are really noisy compared to Scooby and Turtles which are silent. Any one got any ideas on how to sort it? It's not the end of the world I know, but if they're on and I'm not playing it bugs me. Yes, I know I can turn them off, but they look pretty Might be hard to tell from these vids, but its very noticeable IRL

View attachment IMG_0493.MOV
View attachment IMG_0494.MOV

 

[Marvello]

Fit a Stern PSU fan, you won't hear the transformer then! .

 

[johnh]

Haha. Yeah, I put a pink monk in the Turtle, now all I can hear is the JJP machines.

 

[Marvello]

Haha. Yeah, I put a pink monk in the Turtle, now all I can hear is the JJP machines.

Couldn't resist .

 

[taz turbo]

Are you sure it’s the transformer? I’ve never noticed transformer hum on my JJPs, however I have noticed audio hum, I fitted a ground loop isolator which stopped the hum.

Something like this…

Ground Loop Isolator

Ground Loop Isolator – Silence the Noise, Amp Up the Game Say goodbye to annoying hums, pops, and crackles with this easy-to-install Ground Loop Isolator. Designed to eliminate ground noise in your audio system, this filter plugs right in with a simple 1/8-inch stereo female-to-male...

nitropinball.com

Chris.

 

[Jason Catrine]

Link to uk one if you want to try it. I put this one into the hobbit and it got rid of the hum via the speakers. Might not be that issue you have but for 4 quid its worth seeing if it helps.

https://ebay.us/m/l2uCif

 

[johnh]

Oh ffs. Every damn time. Dam you auto correct. Pin monk.

 

[johnh]

Thanks guys. No, I just assumed it was the transformer. I’ll give these a go

 

[johnh]

update... It's definitely the transformer. If I turn the machine off it's totally silent.

 

[johnh]

Just kidding. But still the transformer. It already has an isolator. If I turn off the PSU for the motherboard, and pul the power connecters from the main JJP board, still getting the hum. Can only be the transformer right? Movie shows it, but it's more pervasive in the flesh. I've tried the tips I found on pinside, gave it a (gentle) whack with a rubber mallet, tightened the mounting screws, tightening the plates (neither needed it, they weren't lose).
Can I put some rubber or something underneath the transformer ?