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.

After posting my earlier comment on turntable grounding, I realised I had not mentioned anything about direct drive turntables. (I only restore belt drive types) Early on, I did notice that direct drive turntables were more prone to hum. In some cases, the hum increased as the cartridge traversed toward the centre of the record. This type of hum is induced from the motor itself and is very difficult to cure. Some types of cartridge are more prone than others. I suspect that newer direct drives are somewhat better in this respect than the older ones that I was repairing at the time. (Better platter design to shield the motor) It is one of the reasons that I prefer belt drive tables as the motor is further away from the cartridge, but in saying that, I have repaired some belt drive turntables that also exhibited increasing hum as the cartridge traversed the record toward the centre, and hence close to the motor. Early Regas were notorious and I never heard one that did not hum at least a little bit. They all seem to rumble too, but that is a different issue inherent in breadboard designs. I think Rega has addressed the issue by changing the motor, I'm not sure as I haven't seen any late models in my shop.

But getting back to direct drive TT hum issues, you can try different cartridges as some are more prone to picking up hum than others. I think there could also be a case for installing an IEC socket with RF/EMI filter, or some other type of external filter. It can't hurt anyway. Adding a ferrite to the cord may also help and is cheap. Other possibilities to look at are the internal shielding of the tonearm wires and the judicious use of aluminium foil where the wires exit the tonearm (keeping it well away from mains voltages of course!) I have never tried this, but it may help in chronic cases. If people are into modding cartridges by installing them into new bodies, perhaps a body made from aluminium might shield the cartridge better? A lot of cartridges are made with plastic bodies that offer little shielding. Try one with a metal body and see if that helps. If it does, then you're on the right track.

As audiophiles, we all hate hum!

In the Rega arms I've seen, the ground is connected to the shield of the left channel. Instructions to amend this grounding schema is readily available by searching online. However, there is benefit in rewiring these arms as well, as the tonearm wiring is not the best quality anyway. In that case, wire it so as to to incorporate a separate ground wire that you can plug into the ground terminal of your phono amp or amplifier if you have one with an integrated phono stage. There are vendors that sell the complete wiring kits for Rega arms, so check those out.

Mine is built in one box with the boards unseperated, with EI power transformer on top and has no hum.I am using a 20H choke rather than the resistor as listed on the board.

I'm a fan of the NOS GE JAN tubes in general. They are very robust with low microphonics and outlast just about everything else. They also sound VERY good. I'm using some ex video tubes in my Spud.

Same build here with Hammond tx and 20H choke. The TAD 7025s I ordered are marginally quieter than my GE and Philips JAN 5751s, but don't sound as good ( they're of course very good in absolute terms, but some NOS tubes are hard to beat).

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

Thank you for the links! I've been through the lencoheaven thread a couple of years ago. I'll have to refresh myself.

It's the same kit as mine. Have you tried different tubes? For example swapping the first two with 12au7? Also, try swapping cables.

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.

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.