mikepukmel 8/2/2018 7:08 PM
Deluxe Reverb AB763 Grounding Scheme
After lots of reading, I got the idea, mostly that the cathode wiring should be routed first to the filter cap that feeds the plate for that tube. Something like:

[ATTACH=CONFIG]49958[/ATTACH]


But what to do from there? I have a big mess of ground wires running all over the place, and that can't be helping.

In the original amps, there's only one wire leading from the negative side of all the filter caps feeding tubes (power, pi, reverb, tremolo, preamp) and one wire from the reservior caps. they are grounded to the chassis very far apart. i think that's one of my main screwups, trying to route them all to a 'star'.

Is it really so bad to have the preamp grounded to the chassis on one side, and the power stuff on the other side?
 
mac dillard 8/2/2018 7:32 PM
This works. https://el34world.com/charts/grounds.htm Me, I use a variation of that where I separate the pre amp from the power end...Don't solder buss to the back of the pots. Just run a buss wire and pick up all of the pre and ground that on a terminal right at the input jacks. The power end on a terminal close to the 1st filter cap and a separate terminal for the incoming mains ground wire. Works for me.
 
mikepukmel 8/2/2018 9:08 PM
Quote Originally Posted by mac dillard View Post
This works. https://el34world.com/charts/grounds.htm Me, I use a variation of that where I separate the pre amp from the power end...Don't solder buss to the back of the pots. Just run a buss wire and pick up all of the pre and ground that on a terminal right at the input jacks. The power end on a terminal close to the 1st filter cap and a separate terminal for the incoming mains ground wire. Works for me.
Cool, thanks for the link and tips Mac!!
 
Randall 8/2/2018 9:25 PM
Flying a copper bus wire is the way to go. As mac says, don't connect it to the pots backs, all grounds from pots and preamps go to bus, as well as the pre and PI (C and D) filter caps, and then the bus gets grounded close to the input jacks. The B+ and screen caps get grounded with the PT at B+ side of the board. Bias is grounded at a PT bolt, power tubes grounded right at socket side (consider using a 1 ohm resistor for this). I've done two this way, and they are quiet as church mice.

[ATTACH=CONFIG]49962[/ATTACH]
 
mikepukmel 8/2/2018 9:39 PM
Quote Originally Posted by Randall View Post
Flying a copper bus wire is the way to go. As mac says, don't connect it to the pots backs, all grounds from pots and preamps go to bus, as well as the pre and PI (C and D) filter caps, and then the bus gets grounded close to the input jacks. The B+ and screen caps get grounded with the PT at B+ side of the board. Bias is grounded at a PT bolt, power tubes grounded right at socket side (consider using a 1 ohm resistor for this). I've done two this way, and they are quiet as church mice.

[ATTACH=CONFIG]49962[/ATTACH]
Thanks for the info Randall, and thanks for the photo.
 
mikepukmel 8/2/2018 9:40 PM
Beautiful wiring, Randall.
 
mikepukmel 8/4/2018 9:02 PM
Huge improvement, thanks for the suggestions.