Hi,

Last year I bought new boards for my 405 off the online auction site and completely rebuilt them to the new Dada spec.

I also recapped the PSU and used new bridge rectifiers, changing the supply to now be wired as dual mono. I have used lots of smoothing caps across both the secondary and primary windings of the transformer and also across the main smoothing caps, but to no avail!

I'm really pleased with the sound from the new boards, however it is now plagued by pops through the speakers when any lights or anything is switched on around the house (fridge cutting in and out etc.).

It did not used to do this and my Lecson AP1 and Meridian 103D do not suffer from this.

Please can someone advise a remedy?

Many thanks,
Colin