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10-16-2018, 12:07 AM
Hi Noel
There are obvious wire pairs required between the two chassis:
1 - Twisted pair for heaters (6V)
2 - Twisted pair for the mains switch - no need for a relay as that requires an auxiliary PT.
3 - 2-conductor shielded or 2x coax for the output stage grid lines
4 - twisted pair for B+ and ground
5 - coax for the feedback connection
6 - a single bonding wire from the bottom chassis to the upper chassis
Note that in the bottom chassis, there is the main supply up to the screen node feeding the output stage. The #4 pair takes the ground and B+ from this node up to the upper chassis.
Similarly, the FB coax provides the ground reference for the isolated speaker jacks in the bottom chassis, ground referencing occurring at the splitter, as usual.
The elevation for the heaters is done in the lower chassis off the screen node.
The grid-lines could be a twisted pair or the 2-conductor shielded or two pieces of coax. With either shielded cable option, tie the shield to ground in the upper chassis and float it in the lower chassis.
We assume that you are using proper Galactic grounding and that the chassis are for shielding only. In the bottom chassis, the safety ground has its own tie point. The signal ground is made from the Vs-node via a ground-link-isolator. All jacks are isolated in both chassis. The wiring above maintains this principle between the chassis.
Have fun
There are obvious wire pairs required between the two chassis:
1 - Twisted pair for heaters (6V)
2 - Twisted pair for the mains switch - no need for a relay as that requires an auxiliary PT.
3 - 2-conductor shielded or 2x coax for the output stage grid lines
4 - twisted pair for B+ and ground
5 - coax for the feedback connection
6 - a single bonding wire from the bottom chassis to the upper chassis
Note that in the bottom chassis, there is the main supply up to the screen node feeding the output stage. The #4 pair takes the ground and B+ from this node up to the upper chassis.
Similarly, the FB coax provides the ground reference for the isolated speaker jacks in the bottom chassis, ground referencing occurring at the splitter, as usual.
The elevation for the heaters is done in the lower chassis off the screen node.
The grid-lines could be a twisted pair or the 2-conductor shielded or two pieces of coax. With either shielded cable option, tie the shield to ground in the upper chassis and float it in the lower chassis.
We assume that you are using proper Galactic grounding and that the chassis are for shielding only. In the bottom chassis, the safety ground has its own tie point. The signal ground is made from the Vs-node via a ground-link-isolator. All jacks are isolated in both chassis. The wiring above maintains this principle between the chassis.
Have fun
