I am using a Rega P6. However I have the hum when using shorting plugs as well. I haven't had and time to look into this for a while. When I have time I will redo the grounding and see what happens if I put the whole power supply outside of the enclosure.

I bought this one https://www.antekinc.com/as-05t280-50va-280v-transformer/ I also recommend to read this guide. A lot of good tips here. https://www.lencoheaven.net/forum/index.php?topic=26658.0

Well, tried the new transformer today. It's better but still not quiet. I hear hum on louder volume levels if within 1,5 meters from speakers in a quiet room. Not sure if I'm going to get it any better than this. It's good enough even though it bugs me that I can't get it silent. It's a 100hz hum. I even glued thin mumetal on all walls surrounding main board and SUTs.

Yes and no. One problem was poor enclosure design with bad shielding. I have fixed that and got rid of some of the hum. But it seems like there is also hum from my transformer. I ordered a torodial instead with a metal case. Many have reecommended torodial for RIAA since they are emore quiet ad phono stages are very sensitive. Especially if you have the power supply inside in the same enclosure. I recieved the toridial yesterday but have not tested it yet. I will write a soon as I have.

Finally after a lot of testing I am getting some result with my hum. I have an input switch for MM and MC. I have hum even if nothing in connected to an input so I know the hum is from the 834. If I switch to MM, and then ground the switch with a wire, hum is pretty much gone. It disappears completely if I put my hand over the MM inputs, I do not even need to touch them. Same if I hold a piece of metal in front of them. When I plug in my TT to the MM input, there is a faint hum, and it makes no difference if I ground the switch or not. It's a Rega P6, with no separate ground cable. Ground is in the left channel cable. Don't know if that has anything to do with it. If I switch to MC, which is routed trough a pair of Lundahl LL1931 SUTs, I still have hum even with the switch grounded. A little less than when not grounded, but not much. I only have a MC cartridge, so if I want to listen, hum will be present. I have made it so that the switch also switches ground/-. Bad idea? I have changed all the unshielded input wires on the picture to shielded, no difference. Also there is a problem with hum with the Rega P6. I get loud hum when I touch the tonearm and sometimes it stays after I let go of it, sometimes not. If I move around the input cables from the Rega this hum also can start. When I get this hum, I can cancel it by putting a wire from Right input- to chassis, but if I leave this wire permanently it makes the hum come back and is instead cancelled when I remove the wire. This wire do not help with getting hum when touching tonearm either. All of this is so weird to me. So, what can I do now as the next step? Do I need to ground my inputs in another manner perhaps?

I am following this grounding scheme from the LencoHeaven forum. I have tried to hook it up directly to the bolt behind the transformer where the PSU star ground point goes to but without results.

I managed to reduce hum a bit yesterday. This transformer has a center tap for the 6.3V that I was told should go to ground for less hum. I had it installed to my star point. When I removed this entirely, the hum was reduced a bit. Still there but definitely better.

I watched it. My board have the heaters grounded (his did not) so did not help, but thanks. :)