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RE: IEC socket grounding ...

1) It's not good engineering practice to run a dirty AC line ground back right through the input stage components. Furthermore UL and European codes dictate the power safety ground must be bonded by a dedicated purpose means. That means it cannot share with any other wire or component mounting means. Now we surely don't have to follow that rule for DIY but Dennis sells these amps to the general public. They should at least meet the basic electrical safety standards.

2) The negative side of the main filter cap bank is also run back under the input stage. This lead will have substantial 120hz spikes from the rectifier action. Now the use of a tube rectifier does tame these pulses quite a bit. But it's not good engineering practice at all.

But it still might work fine in this amp. Ground loops and EMI/RFI are quite difficult to thoroughly analyze. Even experienced RF engineers as is my area of study, often joke about the witchcraft needed to tame EMI/RFI. But be assured it can be done through mathematics.

So Dennis either got lucky, which is very possible, or there is 120hz buzz on his output.

Also keep in mind that the LSES is deficient in it's filtering ability. So the additional 120hz buzz due to this poor lead dressing may in fact be masked by the amps poor PSRR.




Edits: 11/21/14
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