Another
trying week another email to the list.
I am begining to feel
guilty for the amount of help i am asking other for, however I dont
know where else to turn. I know this is a super-huge email, but please,if
you know anything about echoplex's and their problems and feel you may have
new light to shed, please try contribute before I litterally run out of
options.
I have just spent the whole night determined to iron
out the noise trouble that has plagued black echoplex pro plus (my second of
three).
basically it makes a huge amount of hum all the time
from the moment the power cord is plugged in. this noise rises as the unit
is switched on and can be raised and lowered by adjusting the volume
of the pa system
hower no matter
how the in and output volume pots are set, it makes no differance, also
turning the balance from loop to input makes no change to the hum. the
actual fidelity of the audio behind the hum is fine, i can record a loop and
the loop itself is clear and undistorted.
tonight I have made
some more discoveries that may help someone diagnose the
problem...
1. i have had the roms and ram out of this unit and
swapped with echoplex3 (yes the one that doesnt synch cos of crystals!!)
anyways, i have tried all combinations and echoplex three accepts the ram
and roms from noisy echoplex 2 without any incresed hum...echoplex2 now has
the roms and ram of echoplex3 without any lowering or change of hum
(therefore i can rule out ram and roms as culprits)
2. I was really
persistant and managed to get those damn shields off echoplex2 and gently
pressed the two square chips (this cured a noise problem with echoplex1 back
in the day)...no dice.
I dont have the correct tools to completly remove
these chips and clean.reseat so this is still a potential area that may
harbour the problem??
3. I found that I can connect a lead to
the pa and put my lead into ANY jack round the back,
input,output,footpedal,feedback etc ...the hum is constant across ALL of the
jacks (exceot the synch ones where obviously there is a whining of the
clock).
4. If i plug into my little practice amp the problem
APPEARS to go away...that is to say I can plug echoplex2 into any of the
four pa inputs (and its a new one) , or into other pa's (my friends,my clubs
etc) and AB the same channels and settings with my other
echoplex's...the others are aways quiet...echoplex2 is always
noisy...however in the practice amp things sound as clean as a whistle on
all units?
I don't think i have EVER stuck with such an
unreliable and problematic unit type for so long...ever... that is more
testement to just how GOOD the echoplex can be, i love the way it works ,
when it works..however as a product it appears that all echoplex's are NOT
created equal.
Thanks so much for reading this far, if anyone
knows anyone else who might be able to shed light on this situation, please
email me or forward this onto them.
Love and Warm
wishes
Phill MyOneManBand Wilson
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