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previous: JohnC Try grounding all power supply filt... -- 6/28/2000 6:47 AM

Re: 60 Cycle Beast from Hell ...Please help!

6/28/2000 6:09 PM
Carl Z	Re: 60 Cycle Beast from Hell ...Please help! Grounding is definetly a tricky beast! It seems that no two amps will respond the same to the same grounding scheme. Basically, you've got to screw with it a lot to find out what works best. The method I've got that seems to work well for me is to use a two ground point system. I run a bus ground for all my pots and input jacks and run this to the input stage local ground. From there the entire preamp is run off a bus to it's own ground point which I'll call point "A". all the filter caps for the preamp run to this point with their own wires as does the phase inverter. All the power supply caps that are coupled to the power tubes, including the screen grids go to star point "B". The heaters are just grounded to some convienient location. I know this isn't exactly a textbook grounding method but I've found that any improvements are marginal at best and a clean layout is easier to deal with than having a rats nest of wires running all over the chassis. Carl Z

6/28/2000 6:09 PM

Carl Z

Re: 60 Cycle Beast from Hell ...Please help!

Grounding is definetly a tricky beast! It seems that no two amps will respond the same to the same grounding scheme. Basically, you've got to screw with it a lot to find out what works best.

The method I've got that seems to work well for me is to use a two ground point system. I run a bus ground for all my pots and input jacks and run this to the input stage local ground. From there the entire preamp is run off a bus to it's own ground point which I'll call point "A". all the filter caps for the preamp run to this point with their own wires as does the phase inverter. All the power supply caps that are coupled to the power tubes, including the screen grids go to star point "B". The heaters are just grounded to some convienient location.

I know this isn't exactly a textbook grounding method but I've found that any improvements are marginal at best and a clean layout is easier to deal with than having a rats nest of wires running all over the chassis.

Carl Z