Grounding order on buss bar

[45144]

I have a general question about the order that component grounds should be connected to a buss bar in a tube phono preamp with p2p wiring.

This is what I think for buss bar order:

Chassis - Input - 1st stage - 2nd stage - output stage - (B-) - (H-)

I am not referring to the safety ground, to me that is an entirely separate entity.

Am I thinking correctly?

Thanks

 

[audiowize]

That seems sensible. You can also ground H+ and H- to the chassis with a pair of 220 ohm 1/4W resistors.

 

[45144]

That seems sensible. You can also ground H+ and H- to the chassis with a pair of 220 ohm 1/4W resistors.

Thanks, if I did that then I would not connect it to the buss?

I have also seen some builders ground the buss bar to chassis through a resistor. I wonder about the need for that though.

 

[banpuku]

That seems sensible. You can also ground H+ and H- to the chassis with a pair of 220 ohm 1/4W resistors.

What is "H+" and "H-"? Not familiar with these terms.

 

[45144]

What is "H+" and "H-"? Not familiar with these terms.

Heater positive and heater negative

 

[audiowize]

Yes, you can add that resistor between the chassis and the buss bar. I find this helpful with noisy powerlines.

 

[banpuku]

For clarity, the H- connection point is at the heater transformer secondary, not the H- connected to the tube filament / heater point. Correct?

 

[45144]

For clarity, the H- connection point is at the heater transformer secondary, not the H- connected to the tube filament / heater point. Correct?

No I am referring to the negative leg (or return leg) of the heater circuit, more specifically DC heaters.

 

[6A3sUMMER]

The B+ negative supply lead is either the center tap of the B+ secondary, or it is the Bridge rectifier negative output.

The negative of the B+ supply lead needs to connect directly to the negative of the first B+ filter cap. This is a minimum distance hum and noise ground loop. Good.
After that, put a separate wire from the negative of the B+ first filter cap to the buss bar.

If instead you connect the negative of the B+ supply (secondary center tap, or bridge negative out) to the buss bar, and connect the negative of the first filter cap to the buss bar, you have created a much longer hum and noise ground loop. Bad.

 

[Diabolical Artificer]

your right, in general buss bar order is with the highest current draw circuits at one end, with the least current hungry at the other. It's a good idea to to connect your HT/B+ ground right near the OP stage/OPT secondary ground..

Andy.

 

[45144]

E

The B+ negative supply lead is either the center tap of the B+ secondary, or it is the Bridge rectifier negative output.

The negative of the B+ supply lead needs to connect directly to the negative of the first B+ filter cap. This is a minimum distance hum and noise ground loop. Good.
After that, put a separate wire from the negative of the B+ first filter cap to the buss bar.

If instead you connect the negative of the B+ supply (secondary center tap, or bridge negative out) to the buss bar, and connect the negative of the first filter cap to the buss bar, you have created a much longer hum and noise ground loop. Bad.

Ok, just one connection to buss.