proper filtering for a ruby amp

[sickbend]

I'm finishing up m ruby head it's working and sounds great to my ears but the ac power adapter I'm using is adding a lot of hum to my signal. Is there a way I can make a better power filter in the ruby without building a psu from scratch? and if so is there a way to make it work well with both 9 volt and 12 volt power? thanks guys. I'm asking about the 12 volts cause I will eventually build a tube cricket circuit and will proably run into the same issues 

[km-r]

yes, maybe add a series inductor then after it bulk up with decoupling electrolytic caps...

12v is ok with the ruby...

[sickbend]

what size caps?

[sickbend]

ok lil more info. I went ahead and shortened the ac power wires and changed the 100uf cap to a 220uf cap like the noisy cricket, but here is what's going on. When I'm running off of ac power and the amp is cranked either volume,  gain or both there is a buzzing it's really bad with my strat but not as bad with my sg if I touch the top of the amp which is metal or the strings the noise goes away but as soon as I stop it buzzes again if I'm running off of batteries there is no buzzing noise Can this be fixed or a least reduced significantly?

[dano12]

Couple of things to look for:

1. Are your jacks grounded to the metal enclosure? From your last post, sounds like problems I've had when using plastic jacks that don't connect the ground lug to the enclosure through the barrel.

2. A simple power supply filter is this: 9-12v -> low value resistor -> 47nf film cap to ground -> 100uf electro to ground and optionally another 100uf electro to ground. Like this.

[sickbend]

no it's 2 mono metal jacks connected to a small metal box. I just bouht the stuff to hook up the filter I'll do that tonight and try that but that filter should give a voltage drop no? So can I hook it to a switch so I can disengage it when using battery power? or will it work ok  wired just to the dc wall jack then to the groud of the board?

thanks dano your site is great its bee a huge help as well as everyone on this forum