Hi Barak,
I'm really not familiar with the peculiarities of the Elte, but can't
imagine a $4000 cost to recap any master section (not even the entire
console). I suspect someone gave you bad information here. Most of the caps
used in a "typical" Neotek can be purchased in bulk (hundred count) for
less than .20/each. Labor shouldn't be more than say 4 hours or so for the
master section.
Typicaly, with a bad capacitor in a power supply causing hum the hum
frequency would be some multiple of the mains; ie in your case, 100Hz
(rectified frequency), 200Hz (2nd harmonic) or perhaps a modulation at
150Hz. The 50Hz reading would indicated it is not a capacitor issue.
Please try to verify what was previously suggested by removing one of the
power supplies and see if that alters the hum. If the hum frequency is
50Hz; that is MAINS frequency, so a ground loop, bad ground connection,
etc. is the likely cause. Using two power supplies can certainly lead to
this if they are not properly connected, grounded and summed. A faulty
ground at any point in the console or within the master section may be a
cause; try to verify every single ground point is good. Then read between
each one and the main facility "technical ground". In no case should there
be more than a few ohms difference between any points. Zero out your test
leads first for the most accurate readings.
Next, try to reduce the console to the absolute minimum configuration
possible for testing. Remove all modules except the master section. If the
hum is present then, this at least gives you a relatively small starting
point to work with. If the hum is absent or greatly reduced, one by one
insert the different modules and test after each one. Be sure to power down
(wait till the LEDs on the supply go completely off) before pulling or
inserting modules; do not "hot swap".
Best of luck!
Regards, Jim
At 03:54 PM 1/27/2010, you wrote:
ike, matt hi,
the hum is 50hz(actually 49.7hz).
i pressed all solo's on the ch. it still kept quite.
Audio works on the whole console(mix,busses, direct out, aux)
i didn't check if hum is present on aux section , will do first thing
at morning.
talked with mike and he says there is no other way but recapping the
console inc. master section and then checking if the problem still
appears.
of course that will be the way but its another 4000$ ex labor...
what do you think?
barak
On Jan 27, 2010, at 9:43 PM, Matt Syson wrote:
Hi
You still haven't said if it is 50Hz or 100. (60 or 120). That would
tell us if it is a faulty power supply or something to do with the
wiring.
The solo bus has a lot less 'gain' than the others unless you
operate all the solos at once.
Matt S
BARAK KOREN wrote:
hi ike,
i have checked if the hum was caused due to external induction...
not. i moved the console 50m away, got the same problem.
i also checked and it seems that the hum is present on mix bus and
on the group out busses but is not present on the solo bus??
so this means there is current running on the chassis. i wrote a
help request to mike s. and i hope i'll solve it asap.
i have a wooden cover i tried covering with metal, still no effect.
i wrote a help request to mike s. and i hope i'll solve it asap.
if anybody has a creative idea, please.
thanx all for help and effort.
Barak Koren
On Jan 27, 2010, at 4:45 PM, Ike Zimbel wrote:
Hi Barak,
Is the bottom cover wood or metal? If it's wood, it will make no
difference, if metal, it may help to mount it.
best,
Ike
On 1/26/2010 4:15 PM, BARAK KOREN wrote:
no induction problems experienced, psu 3m far from console,
consoles bottom cover is not mounted.
moving the psu don't make any difference.
yes both psu are connected with diodes.
thanx
barak
On Jan 26, 2010, at 9:47 PM, Ike Zimbel wrote:
What is your studio like for noise in general? Do you have
problems with single coil pick-up guitars (like a Strat...)
picking up noise in the room? Are you in some part of the
building near heavy power lines or transformers?
iz
On 1/26/2010 3:40 PM, BARAK KOREN wrote:
mixer is not connected to any thing ...
barak
On Jan 26, 2010, at 9:37 PM, Matt Syson wrote:
Hi
If it is 50 Hz then it is probably induction from external
wiring. PSU related 'hums' are usually double (100) or triple
the mains frequency.
Matt S
BARAK KOREN wrote:
ike hi,
Back to the elite 40 channels 1986 humming issue.
i recapped and refurbished both psu,i changed connectors to
NL8 and i measured 17v on motherboard, so thats fine.
the two psu are connected parallel for the whole console(not
like some modes made ,one psu for each side of the master
section).
The mixer is quite when all channels muted.
The hum (about 50hz) appears when channels are ON (faders
down) and is present on all channels.
reading this:
If / when you re-do the PS connection at the board end, it's
a good idea to put in some de-coupling caps on the supply
voltages where they come into the console. About 4700-5600uf
at 35-50 volts is good for the +/-18v rails (two caps total),
1,000uf / 50v for the -25v rail, 100uf / 100v for the +48v
rail. The 36 volt rail is kind of optional but use at least a
50v cap, preferably 63v if you put something across it.
Best,
ike
Hi Barak,
Two power supplies makes it WAY more complicated than
that. You might want to check with Mike at Sytek and see if
he will trade your power supplies for an upgraded one that
will run the whole console. Otherwise, we have some talking
to do...
I will send the NL-8 pin-out when I get a chance to look for
it.
best,
Ike
i still didn't try option one (caps mode on the board
side)... thought you can advice...
Thanx
Barak Koren
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Vive Le Neotek!
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Ike Zimbel
Zimbel Audio Productions Ltd.
Toronto
416-720-0887
"Studio House Calls". Authorized Warranty service for Allen&
Heath, Clear-Com, Drawmer, Soundcraft, SPL and Yamaha. Repairs and
upgrades to analog audio equipment including: AMEK, dbx, Neve,
Neotek, MCI, Soundcraft and more. Ask about our RF Frequency co-
ordination services!
www.zimbelaudio.com
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