Hi Andrew,
Not quite clear on this...did this desk come with a power supply,
which you have since had replaced? If so was it a PS-3, or something
smaller? If it did have a PS, the Mutes, meter switching etc. were
working originally?
It sounds like the new PS doesn't have the -25 volt logic supply
rail. The logic voltage is derived from the 7 volt differential between
the -18 volt rail and the -25 volt rail.
On the level difference issue, what chips were swapped? If, by chance,
a THAT Corp 1646 chip was subbed for an SSM2142 or DRV-134, the THAT
chips have slightly lower output than the TI or AD equivalents. Note
that none of those balanced output driver chips would have been in the
original design, but I have seen them modded in on some Elite strips.
There's also some question about what additional circuitry was added in
by Neotek to make two channel strips function as a "console". I'm
guessing one of their balanced o/p cards that usually plug into the
master module to drive the XLR o/ps.
Best,
Ike
Andrew Bencina wrote:
Hi Ike, as I say I've recently had a new power supply built and have
also had some of the chips updated, specifically 3 in the EQ section
and 1 in the output/insert section.
Since I've got it back there are a few logic issues which were not
there prior to the chip upgrade and I've also noticed a few
calibration issues which just havn't been seen to.
1. The channel On/group select buttons at the fader which on my unit
function like mutes were working and now do nothing.
2. The meters seem only to be responding to the Tape returns rather
than the Mic inputs. Even when you switch to monitoring the Mic the
meters keep metering the return. I'm sure this was not happening
before and when you switched the fader from Tape to Input the meters
also responded in kind.
Calibration
3. When using the Line inputs Channel 2 is 1.6dB down on Channel 1
through the fader and 0.7dB down on Channel 1 through the monitor
section. Also when passing a 1kHz tone through the channel the channel
2 output is fluttering just slightly (+/- 0.5 dB) while channel 1 is
rock solid. These balance issues are not apparent when using the Mic
inputs although there is again a slight instability and maybe a 0.1 dB
drop on Channel 2 when routed via the monitor section.
4. I also suspect that the channel 2 metering is not quite calibrated
properly but this is all tied up in the previous issue and needs to be
dealt with first.
Finally when I first used the Monitor section channel 1 would drop out
when the knob was full on and panned hard left or right. This however
seems to have settled down. It should be understood that the unit was
basically sitting in a storage shed for 20 years until I came upon it
by accident when picking up another ebay purchase from the guy so I am
allowing for some issues relating the getting it back up and going.
The key issues above are the ones which were working fine and have now
stopped.
My tech has requested that I try and get hold of the necessary circuit
diagrams so that he can assess and hopefully resolve these issues.
Thanks for your time, Cheers
Andrew
Ike Zimbel wrote:
Hi Andrew,
Welcome aboard! That is a really cool little console you've got
there. What issues are you having with it?
best,
Ike
Andrew Bencina wrote:
Apologies for the non-regulation post, here it is in regulation format.
Hi, First time poster so I'm hopeful that someone may be able to
help. Some time ago I acquired a very unique 2 channel Neotek
console from the guy who was the Australian Distributor many years
ago. They had them made for trade shows etc. I've attached some
photos for those who may be interested.
It took me a while but I had a new power supply built for it, which
sounds great, and just have a few very minor issues that need to be
attended to. I have thus far been unable to get hold of the circuit
diagrams for the Elan (or Elan II - not exactly certain which one
it is) mono channel strips in order to complete the restoration and
my tech has been working with diagrams from the Elite and
information from others to get as far as we have.
Any help that this list could provide in this pursuit would be most
gratefully received. Please don't hesitate to get in contact. It's
all basically working well and sounding great and I'd really love
to finish off the job properly.
My contact details are below and I hope that we may be able to sort
it all out.
Thanks again to you all and Seasons Greetings.
Cheers, Andrew
http://www.winterhillmusic.com.au/side-view.jpg
http://www.winterhillmusic.com.au/back-panel.jpg
http://www.winterhillmusic.com.au/channel-strip.jpg
*Andrew Bencina*
Winter Hill Music & AudioTechnology Magazine
Studio +61 3 98700084
Mobile 0403 814 369
Email [email protected]
Web www.winterhillmusic.com.au
Mail PO BOX 2482, Ringwood North VIC. AUSTRALIA 3134.
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--
Ike Zimbel
Zimbel Audio Productions Ltd.
Toronto
416-720-0887
"Studio House Calls" - Repairs and upgrades to analog audio equipment including:
AMEK, Allen & Heath, Neve, Neotek, MCI, Soundcraft and more.
www.zimbelaudio.com
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questions --please send an email to mailto:[email protected].
The Neotek list is lovingly hosted by Catapult Web. Remember that any message
or reply sent to the list will be automatically forwarded to all subscribers.
Vive Le Neotek!
Thanks.
