Grounding strap insulation

[Andy B]

The backbox speakers on my Star Wars are humming loudly. Am I right in thinking this could be caused/worsened by uninsulated grounding braid?

Both speakers are attached to back plate of backbox using bare grounding braid.

Anyone know where I can get some insulation from please? Searching all the usual sites for “grounding braid insulation/sheafing” I’m coming up with nothing.

Can I just use any old kind of tubing - e.g. aquarium tubing?

Thanks

Andy

 

[Sgt GrizZ]

On no. The dreaded Data East hum.

Good luck.

Sent from my D5833 using Tapatalk

 

[Sgt GrizZ]

If the hum persists ....have a read of these threads

http://www.pinballinfo.com/communit...um-sega-data-east-machines.38041/#post-230586

http://www.pinballinfo.com/community/threads/jamma-psu-for-de-sound-card-de-hum-cure.36572/

I have tried the following to sort out the 'hum' on my DE Tommy ....none of which have made much/any difference Some people have had success doing some of these ..... it is odd how nobody can seem to find a definitive fix

Tightening soundboard screws
Floating the soundboard off the backplate
Replacing the BIG blue capacitor/bridges with Incochnitos Bridge Board
Seperate power supply for sound board

I believe installing a Pinsound board will maybe sort it - but that's an expensive fix.

 

[Andy B]

If the hum persists ....have a read of these threads

http://www.pinballinfo.com/communit...um-sega-data-east-machines.38041/#post-230586

http://www.pinballinfo.com/community/threads/jamma-psu-for-de-sound-card-de-hum-cure.36572/

I have tried the following to sort out the 'hum' on my DE Tommy ....none of which have made much/any difference Some people have had success doing some of these ..... it is odd how nobody can seem to find a definitive fix

Tightening soundboard screws
Floating the soundboard off the backplate
Replacing the BIG blue capacitor/bridges with Incochnitos Bridge Board
Seperate power supply for sound board

I believe installing a Pinsound board will maybe sort it - but that's an expensive fix.

Thanks for the tips/advice. I’ve checked the board’s well screwed in but will try the other stuff.

Toying with idea of PinSound board but like you say, very expensive.

 

[Andy B]

Ordered PinSound.

I did try the floating board method but no good.

 

[AlanJ]

Line filters, earth bonding, shielding, isolated power supply, ear plugs.