Weird Noise When Turning Off E-Piano's Amp

[sarakisof]

Could something like that work in terms of good mechanical support & mounting of the little traffo?  (No mount pins & PCB used).




The two eyelet boards will be then screwed onto the base with plastic plain standoffs.

[Rob Strand]

The mechanical stress for any mounting needs to be transferred to body of the transformer via the mounting tabs.  Hanging off the pins like that, or anything similar, is likely to fail at some point.   The pins should have no mechanical stress or movement.

[sarakisof]

The mechanical stress for any mounting needs to be transferred to body of the transformer via the mounting tabs.  Hanging off the pins like that, or anything similar, is likely to fail at some point.   The pins should have no mechanical stress or movement.

I was afraid of that, i guess i have to go with a board option. The boards i have and will fit my layout i have in mind are those strip / vero boards old style with common copper. Were nice to me with everything I've built in the past but as years pass and i read more and more negatives about them people complaining about not being so robust, easily oxidizing etc. I've been suspicious of them. Nowadays, when it's about PCBs, i use to create in Eagle and send gerbers to China for manufacturing.
But in this case, I don't want to wait for so long, plus i find this
way too "modernized" for a Pianet like this. I think best bet would be an old style hand copper etched board (like they did in the T's little board I've posted in previous pages) but I was never into PCB etching solutions etc. Won't buy all those chemicals for  just one tiny project like that, nor do such for the first time in a project like a valuable Pianet.
Do you think I'm overthinking it? Go with a vero spray some clear lacquer underneath / copper side and be done with it?

[anotherjim]

If you search for it, there are a few DIY etching processes using common chemicals that you might already have. The traditional brown resin-bonded paper copper-clad board is not so widely stocked, despite it still being common in consumer electronics and of course, stripboard.

Whatever you do, tarnishing is still possible. PCB lacquer can be sprayed on, essentially polyurethane varnish. You can solder through it.

[sarakisof]

After a long, nice journey I'm pleased to announce that i completed the Pianet M's mod with full success. No hum, no any noise, clean signals, mod works as it should. You just push the toggle switch up and you get Passive function (Pianet T mode), then you switch the toggle down & powering unit up and you return to its original normal function. No extra holes drilled, no components removed. Originality of the instrument kept intact. Just perfect.







I'll just add an embossing tape label reading "Passive" or "Pianet T" above the switch and I'm done.



Special thanks to Rob, Jim, PRR and everyone else contributed here. Without your valuable help it could never happen.