Hi there,
I'm building a two channel EZ1290. Being oscillation problems very usual, I want to be very careful about placement of the transformers and the internal layout.
I attached a picture with some notes to show you my actual idea, but want to ask your opinion before starting to drill the chassis.
Please don't mind channel two, and its input transformer position, and its xlr mounting wooden piece

it was mounted in a testing case.
The reference layout is shown on channel 1.
I have read that one important thing is to mount the audio transformers far from each other. Being my chassis quite tight, it's not easy.
Then, I tried to keep the unbalanced connections (from input transformer to pcb and from pcb to out transf) as short as possible.
One of the doubts I have, is if the output transformers too close to in/out xlr can cause noise problems.
About the power supply section, I really don't like the idea of mounting it in an external case. I know it's better for hum problems, but i thinked that a similar result regarding isolation/shielding could be mounting a piece of alluminium inside the case (connected to ground), to separate and shield the power supply section from the audio circuitry. What do you think about this?
Any input is highly appreciated, thanks in advance.