With no source connected via the phono connectors on the steel case to the K8084:
GND on the K4006 is 13.5v ac (measured to earth and ground at the power source) this is connected to the K4004b which is connected to the K8084 and that is connected to phono plugs on the steel casing i made so effectively the K4006 is putting 13.5v ac into the casing and the metal frame bit around the transformer for the K8084 reads as 1.4v and when this comes in to contact with the case a buzz comes out the speakers so i cant bolt the K8084 transformer to the case.
With source connected via the phono connectors on the steel case to the K8084:
GND on the K4006 is 2.1v ac and the metal around the K8084 transformer reads as 0.6v ac and there is still a buzz when the K8084 transformer comes into contact with the case and therefore the GND of the K4006.
Why is there AC coming from the GND on the K4006, do I have to GND the GND on the K4006, and how can i stop the buzzing?
The voltage you measure are floating voltages, they are not correct. You cannot measure between the earth and the GND.
Solving hum troubles can be very difficult, even for an experienced engineer. Certain rules need to be followed when arranging the wiring.
If we understand correctly, the GND of your cinch-terminals is connected to the chassis. You should avoid that.
Ideally, you should only have one common GND connection, preferably at the GND of the power supply.
Remark: Please don’t start a topic with ‘issues’. Please make it clear what kits are concerned.
But the phono plugs on the case (with ground on the plugs electrically attached to the case) for the input are effectively connected directly to the ground on the K4006 via the phono cables going between the K8084 and K4004b, now, the metal frame round the little transformer for the K8084 also has a small ac current going thru it and when that touches the steel case it causes generates a buzz at the K8084.
The K4004b makes a loud pop when the power is switched off because the K8084 first while the caps on the K4006 run down is there any way to avoid this?
Yipee i found a solution for the buzz coming from the K8084’s transformer when its in contact with the case, all i have to do is place a little wire between the earth corner of the K8084 and the case as the buzzing stops when anything is in contact with this earth corner of the pcb.