I'd proceed with caution. The
LM4562 looks like a great chip, BUT, the data sheet says that it's max
supply voltage is +/-17volts...the Neotek runs on +/-18 volts. Also,
the OPA2134 spec says that it is perfectly happy driving 600 ohm loads,
so that may not be the issue. If you are loosing headroom because one
or more chips is actually oscillating way out beyond the "dog ranges",
the 4562 could potentially make that even worse, as its maximum gain
bandwidth is 55mhz as opposed to 8mhz for the 2134!
Best,
Ike
The Bubble wrote:
Thanks for the replies guys!
I fell like I didn't lose too much. I'am gonna try some other chip
options. There are a few places where I want to swap out the OPA2134's
for LM4562. The
OPA2134s aren't so good for driving low impedance loads. which means
lower headroom and increased distortion. the LM4562s will go in the
output stage and any noninverting buffer applications. I guess that's
where OPA2134's suck.
I'll let you know how it goes when I can find some time to open her up.
thanks again.
On Sat, Jan 3, 2009 at 7:49 PM, Ike Zimbel <[email protected]>
wrote:
Hi Alex,
Can you quantify this a bit? Like how much headroom do you think
you lost? One thing you could try is putting the stock chips back in
one at a time and see when you notice a performance change. I have yet
to find one chip that I will use in every position in a Neotek.
best,
Ike
The Bubble wrote:
So recently we did some minor "upgrades"
to the master/monitor section
of our Elan 2. Just some ideas I picked up on the board. One of the
things I thought it would do was give us more headroom. but seems like
we kinda lost a little. Heres what we did...
added burr-browns (OPA134 & OPA2134) to the master/monitor
section. Also WIMA
MKP2 0.1uF polypropylene caps to bypass all the electrolytic coupling
caps. also upgraded all 30 or so stock 10uF's. we left those original
non-polar caps in place and
soldered a 0.1uF MKP2 polypropylene cap in parallel with them.
If anyone has some thoughts on the matter I would love to hear them.
thanks and happy new year.
--
Alex Lyon
www.bubblerecording.com
--
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.
--
Alex Lyon
www.bubblerecording.com
--
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.
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