New Power Cable on a 1990 Hafler DH120?

@itsjust me-

     I’m certain everyone is duly impressed, with your expertise.

     Just keep in mind: you don’t stand alone, with however many decades of experience you’ve under your belt.

     As I mentioned: aside from the very possible failure issues, which could easily be created by someone without the experience to prevent them, there are the EMI/noise effects that can be created.

     I’ve had to undo some bonafide abortions, in the past 40 years, created by those that didn’t know what they were doing.

     The OP’s only interest was that of a power cord replacement.

     And, directly to the point of my previous post: You failed mention anything about, "reasonable sizes", when you said, "THE BIGGEST CAPACITANCE POSSIBLE".

     There’s enough room in the typical Hafler chassis, to install much more capacitance than advisable.

                                                  Happy listening!

 " ...with reasonable sizes, say 33k-50k uF, its simply not an issue."

                                            Happy listening!

@itsjustme -

       In my book: informing another on ways to prevent catastrophic failures (ie: upgrading rectifiers, etc), BEFORE they cause them (ie: by installing biggest capacitance possible), is simply sagacious, but- that’s just me.

              A transformer failure is a real possibility and much more expensive than $3.00.

              But then: why should YOU have, "worries", about THEIR results, right?

                                                              ie:

So, with a big, heatsinked 35 amp bridge i have put 1/4 Farad (eread that again, yes F) in a DH-200. and if you do blow it up its $3 online for a new bridge. SO A GIANT "MEH" TO THE WORRIES.

                        Be careful with your acceptance of advice!

     When choosing the values of a power supply's filter caps, it's important to understand how the supply/circuitry functions.

     ie: When a DH-120 is switched on: the capacitors initially present (what appears to be) a dead short to the amp's 8A (OEM) rectifier bridge.   The greater the filter capacitance: the higher the current necessary to charge the caps.

     Increasing the capacitance beyond a certain point, in most amps; it's easy to end up with blown rectifiers (possibly: a burnt transformer).

     Of course: much of the above depends on how well the amp is protected, but: too much capacitance is simply asking for trouble. 

     It's always been my practice, when addressing power amp improvements (50+ years now), to first upgrade the rectifiers/rectifier tube/bridge, as that's always made the most marked/audible uptick in presentation.    WHY?   Because, in most cases: manufacturers don't use the best/most expensive parts they can find.

     An increase in filter capacitance can reduce ripple in a power supply, but: going too far can change (decrease) conduction angles, increase peak currents and result in EMI/noise generation, in/from SS rectifiers.     The harmonics of that EMI/noise can easily defeat any performance gains, gleaned from ripple reduction.

https://electronics.stackexchange.com/questions/217212/how-can-i-observe-rectifier-switching-noise

'The two large power supply capacitors, being 30 years old and electrolytic, probably only have about 1/3-1/2 of their original capacity.  Buy new drop-in replacements - the largest that you can fit into the band-clamps (in other words same form factor, same or higher voltage, BIGGEST CAPACITANCE POSSIBLE). "

                                             +1 for the rest of that post, of course.

@wlp3-

     No one can tell you whether YOUR system/ears will (or can) resolve/discern any improvement(s), if your Hafler's PC is upgraded.

     Having done a number of such upgrades, on Hafler equipment:  I will state that the move invariably brought a smile their owners' faces.   

     I would, however, recommend replacing any and all electrolytic capacitors, of your DH120's power supply and driver boards, before bothering with the PC.  Yours are around 30 years old.

     It's been my experience: the better the condition of any unit's stock circuitry, the better (more audible) the result of any upgrades/tweaks.

                                                    Happy listening!

     The local Master Of The Deluded ("Trust ME, I’m a fictitious operative!"), recommends joining a delusional, "Society".

                                      Reverse psychopathy?

                                              Projection?

                                           Either or both =