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ssm-2017/ne5532 preamp
Old 14th August 2005
  #1
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ssm-2017/ne5532 preamp

I noticed some inexpensive preamps in an auction recently and would like some optinions. They're Benchmark MP-3 preamps and use a ssm2017 input stage with a ne5532 output driver. Is this a good formula for a mic preamp?
Old 15th August 2005
  #2


Properly implemented, those make a pretty decent pre-amp.

There is a lot to good design, though. A "typical" circuit using these should be decent.



-tINY

Old 15th August 2005
  #3
Gear Head
 
Marty Shields.'s Avatar
 

you could probubly improve the dynamics by swapping the 5532 with an LM833
I think the ssm 2017 with the right coupling circuit are very good.
Marty.
Old 15th August 2005
  #4
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Well, at $40 per, I bought a few. I'll try some with the lm833. Then try some with the 48v blocking caps removed. It looks like a pretty simple circuit so there's probably not much to be done in the way of mods.
Old 17th August 2005
  #5
Quote:
Originally Posted by TAVD
Well, at $40 per, I bought a few. I'll try some with the lm833. Then try some with the 48v blocking caps removed. It looks like a pretty simple circuit so there's probably not much to be done in the way of mods.

Sure there are. Dump the SSM2017 and install a socket. Pop in a BurrBrown IN217 or an Analog devices SSM2019. Use a couple of Panasonic 100 uf/50 v FM series input blocking caps. Bypass with some nice polyprop film caps. Dump the edgy 5532 and the soft LM833/upc4570 and pop in a BurrBrown OPA2134 or a OPA2604, or a Linear tech LT1358 or a National LM6172.

Jim Williams
Audio Upgrades
Old 17th August 2005
  #6
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Phil Cibley's Avatar
 

Jim:
That's a really small circuit board on the MP-3. It attaches to the back of a
panel mount XLR connector. If I remember correctly everything is surface mount,
so putting in a socket, or changing components is pretty much out of the issue.
All things considered, they sound pretty good out of the box, and have a lot of available gain.
The Benchmark website has a manual for download. I think it has a schematic.

Phil
Old 17th August 2005
  #7
Quote:
Originally Posted by Phil Cibley
Jim:
That's a really small circuit board on the MP-3. It attaches to the back of a
panel mount XLR connector. If I remember correctly everything is surface mount,
so putting in a socket, or changing components is pretty much out of the issue.
All things considered, they sound pretty good out of the box, and have a lot of available gain.
The Benchmark website has a manual for download. I think it has a schematic.

Phil

The above mentioned components are available in S08 surface mount packages. With care they can be easily replaced.

Jim Williams
Audio Upgrades
Old 17th August 2005
  #8
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Phil Cibley's Avatar
 

I guess that depends on your definition of easily. Most people barely have
a proper soldering iron, let alone a proper rework station for SMT components,
or the chops and patience to do the job. Just my .02
Old 18th August 2005
  #9
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Phil Cibley's Avatar
 

I just looked at an actual Benchmark MP-3, and not a surface mount component in sight. Furthermore, the ICs look like they are socketed, so it looks like all my yammering about SMT components etc is all OT. Mods look do-able, although you'll still need a light touch to get into the small spaces.
Sorry
Phil
Old 18th August 2005
  #10
I say have at it. Try the SSM2019, the BB IN217 and try out the new that 2017 replacement. You have 3 pre chips you can pop in there. Report back which pre chip you like, it's still an open book on them here. Try an LM6172 in the 5532 position.

Jim Williams
Audio Upgrades
Old 25th August 2005
  #11
Gear Maniac
 
rodabod's Avatar
 

I personally think that the 5532 / 5534 are perfectly good opamps for mic preamps.

Some others may sound different, but not necessarily better.

I would recommend looking into the signal path caps.

Can you still buy these?

Roddy
Old 25th August 2005
  #12
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I just bought a bunch of NOS ones for next to nothing. They arrived today but I haven't powered them up yet. Looks like the ICs are on sockets. The electrolytics are Spraque (in the input at least). So I'll try a few different ICs and leave a few stock, see what I like.
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