peter ****wit puked:

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** Good servicing practice requires that you FIRST observe a fault
before delving inside to find the cause.

Consider that the unit may have no fault at all, the reported noises
being fed in from an external device and / or are due to AC supply
transients.


.... Phil


I would agree with you up until the point where after several days of
waiting, and no faults are exhibited, then a peek inside the unit might give
you a clue. Maybe something spilled inside, or perhaps another tech might
have done some creative repairs.


** The flaw with that idea is that you will very often find something odd looking and wrongly assume it must be the cause of the reported fault - when it is not.

False alarm reports are VERY common with guitar amps and accessories plus also with disco equipment and PA gear.

If after a reasonable time running and testing a unit, it shows no sign of the reported fault then it becomes the owner's problem to DEMONSTRATE the fault to the repairer.


.... Phil


The difference is: An amp in service is loaded, unloaded, lifted, carried, vibrated, kicked, and otherwise physically abused.

An amp in the shop sits quietly on a bench or on a shelf with nothing to
disturb it.


** Not in my shop it don't !!!



A customer who puts equipment into the hands of a tech - and is thereby
spending money has no reason to create a false (and possibly costly) alarm.

** Irrelevant garbage.


An Honest Tech is obligated to take the customer at their word.


** Only a stupid tech believes that garbage.


Hence the advice to check for visible defects, to tap the parts with
a diddle-stick or similar - in other words, go looking for trouble.


** In my shop, "testing" involves a full range of operation and performance checks - including some rough treatment plus tapping on PCBs and tubes while running at full power and idle.

The OP here has a simple SS monitor amp with a vague complaint of pops and crackles that will not show.

My advice was 100% solid and professionl.

As bloody usual yours is the opposite.




..... Phil