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11-28-2022, 06:48 AM
Hello DTBRadio!
How was thanksgiving?
As far as I understand it is best to create spots where grounding comes together, and then ground one of those to the chassis.
KoC calls this "galactic grounds" because it looks like a set of stars and then one grounding point.
But from what I read you already know that?
The problem with multiple groundings spaces is that ground loops can occur.
So this means that you should insulate the input jack.
Is that easy to do for you? If you have a metal jack for input? Then you must drill a bigger hole and use fibre washers, and maybe you don't have those.
Maybe you could use a plastic jack?
So, you would have one grounding point for the signal. That is signal ground.
Then there should be another grounding point for the AC-receptacle, the ground wire for the power transformer (if it has one) should be connected there as well.
That is chassis ground.
I cannot advise you about the hissing problem.
I had that with one preamp I built bit later the problem was obvious: I was using a cathode follower, but that was a few tubes away.
That distance was way too long.
Strelok
How was thanksgiving?
As far as I understand it is best to create spots where grounding comes together, and then ground one of those to the chassis.
KoC calls this "galactic grounds" because it looks like a set of stars and then one grounding point.
But from what I read you already know that?
The problem with multiple groundings spaces is that ground loops can occur.
So this means that you should insulate the input jack.
Is that easy to do for you? If you have a metal jack for input? Then you must drill a bigger hole and use fibre washers, and maybe you don't have those.
Maybe you could use a plastic jack?
So, you would have one grounding point for the signal. That is signal ground.
Then there should be another grounding point for the AC-receptacle, the ground wire for the power transformer (if it has one) should be connected there as well.
That is chassis ground.
I cannot advise you about the hissing problem.
I had that with one preamp I built bit later the problem was obvious: I was using a cathode follower, but that was a few tubes away.
That distance was way too long.
Strelok
