PSU11/Phono11 - voltage drop

[Black Stuart]

Hi all,
finally finished re-building Phono11 using the new PCB, completely forgetting to do the RIAA mod (tonto).

Decided it was as easy to test voltages 'in situ'. After changing R6 in PSU11 to 18K as I previously had around 265V being delivered to the phono stage, I plugged in. Strange I'm only getting around 145-150V at the Cliffcon socket in Phono11 so, I need to check out PSU11.

As you will see from the voltage check I'm getting near perfect readings under no load and also from T/P 1/2/4 under load. In brackets desired voltages:

No Load Under Load
Test point 1/ 364 (363) 338 (338)
2/ 355 (353) 323 (327)
3/ 354 (345) 143 (250)
4/ 110 (110) 108 (106)
5/ 44 (44) 142 (41)
5/ 44 (44) 142 (41)
6/ 58 (56) 153 (50.5)
7/ 50 (50.3) 148 (47.3)
7/ 50 (50.3) 148 (47.3)
8/ 45 (44.6) 142 (41.6)
9/ 46 (45.2) 142 (42.2)

I changed R6 back to the original 15K - no difference. Measuring leg nearest to T/P 1 all is well - the second leg is where it all goes wrong. I also changed connection lead to Phono11 - no difference.

All in all very weird. I suppose it must be component failure but where?

I hope you can interpret the figures for some reason they have all been lumped together which is not how I set it out.

Black Stuart