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Author Topic: Aerco MP-2 preamp - Part 2  (Read 81343 times)

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Offline Todd R

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Re: Aerco MP-2 preamp - Part 2
« Reply #150 on: January 28, 2013, 12:33:53 PM »
I've used the mini out, and now I wish I could remember what show it was for (so I could correct it).  In doing some testing with my Aerco this weekend, I realized that the mini out is wired backwards for the typical stereo minijack -- left and right channel are swapped (meaning technically, the tip is the right signal and ring is the left signal on the jack).

At least it is on my Aerco, not sure if this is the standard Jerry used for all the Aerco's.
Mics: Microtech Gefell m20/m21 (nbob/pfa actives), Line Audio CM3, Church CA-11 cards
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cashandkerouac

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Re: Aerco MP-2 preamp - Part 2
« Reply #151 on: January 30, 2013, 02:41:10 PM »
^^^ my L-R channels are the same whether i use the RCA outs or the mini out.

Offline drewski1986

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Re: Aerco MP-2 preamp - Part 2
« Reply #152 on: February 01, 2013, 04:51:57 PM »
Thanks for the replies.  For the record, my L-R are the same also whether using rca's or mini jack out.

Offline jbell

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Re: Aerco MP-2 preamp - Part 2
« Reply #153 on: March 02, 2013, 11:58:23 AM »
Anyone using rechargeable 9v's in their MP-2??  I'm curious what the run times are with rechargeable batteries.  Thanks
Microtech Gefell M20's> Nbob KCY> Naiant PFA(60V)> Sound Devices Mixpre-6

Offline markrsmith

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Re: Aerco MP-2 preamp - Part 2
« Reply #154 on: March 02, 2013, 02:41:35 PM »
I don't think they fit.  That is why I did not buy one.  I emailed Jerry about it, and he said they did not fit.  For what ever reason, I do not know.

Offline larrysellers

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Re: Aerco MP-2 preamp - Part 2
« Reply #155 on: March 02, 2013, 04:16:10 PM »
They fit fine in my Aerco. I got around 4 hours going mk4->cable->pfa-> aerco but I am sure it could have ran longer.

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Re: Aerco MP-2 preamp - Part 2
« Reply #156 on: March 02, 2013, 04:18:12 PM »
Thanks!  What brand did you use??

They fit fine in my Aerco. I got around 4 hours going mk4->cable->pfa-> aerco but I am sure it could have ran longer.
Microtech Gefell M20's> Nbob KCY> Naiant PFA(60V)> Sound Devices Mixpre-6

Offline larrysellers

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Re: Aerco MP-2 preamp - Part 2
« Reply #157 on: March 02, 2013, 04:28:50 PM »
POWEREX - Make sure they are marked 9.6v. I don't know if the Aerco is as picky as the nbox. It may run fine with regular 9v(8.4) rechargables but I have never tried it.

Offline F.O.Bean

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Re: Aerco MP-2 preamp - Part 2
« Reply #158 on: March 03, 2013, 12:01:31 AM »
Anyone using rechargeable 9v's in their MP-2??  I'm curious what the run times are with rechargeable batteries.  Thanks

Congrats on the Aerco buddy ;) When/where did u score it? I ran one for awhile WAY back in the day
Recording Gear:
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Offline jbell

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Re: Aerco MP-2 preamp - Part 2
« Reply #159 on: March 03, 2013, 09:27:52 AM »
Grabbed the one Brian was selling in the YS!

Anyone using rechargeable 9v's in their MP-2??  I'm curious what the run times are with rechargeable batteries.  Thanks

Congrats on the Aerco buddy ;) When/where did u score it? I ran one for awhile WAY back in the day
Microtech Gefell M20's> Nbob KCY> Naiant PFA(60V)> Sound Devices Mixpre-6

Offline audBall

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Re: Aerco MP-2 preamp - Part 2
« Reply #160 on: June 01, 2013, 07:39:10 PM »
So, I took the (impulse) plunge and snagged a MP2 that was on eBay, of all places. It's unlike any type I've ever seen before...no gain knobs. It appears to be in fairly unused condition with very little wear at all. The gain range is 20-50db and is selected via internal selector switches that can be adjusted with a jeweler's screwdriver through the RCA outputs. I didn't realize until I completed the sale that is was from Jerry Bruck of Posthorn. I have a Tekkeon knock-off that has a handful of power connectors and one fit the unit quite well and it powered right up. Looking forward to giving it a test-drive here soon.

There are graphs included that are apparently from Vark Audio and are dated 9/26/91, so it's at least that old. Not a bad GD show that night.  ;)

Here are some pics:





akg ck61/62/63/77(c577)|naiant.pfa, dpa smk-sc4061 
lunatec v2, mma-a d:vice, mma-6000
edirol-r44(ocm), sony pcm-m10,-d100

PISO akg nbob cables

Offline larrysellers

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Re: Aerco MP-2 preamp - Part 2
« Reply #161 on: June 01, 2013, 09:13:46 PM »
Nice preamp.

Marshall7

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Re: Aerco MP-2 preamp - Part 2
« Reply #162 on: June 01, 2013, 11:28:48 PM »
"The gain range is 20-50db and is selected via internal selector switches that can be adjusted with a jeweler's screwdriver through the RCA outputs."

Yeah, that's handy ::)

Offline noahbickart

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Re: Aerco MP-2 preamp - Part 2
« Reply #163 on: June 02, 2013, 02:52:39 AM »
"The gain range is 20-50db and is selected via internal selector switches that can be adjusted with a jeweler's screwdriver through the RCA outputs."

Yeah, that's handy ::)

As long as the a>d converter has adjustable gain, what's the problem?
Recording:
Capsules: Schoeps mk41v (x2), mk4v (x2), mk22 (x2), mk3 (x2), mk21 & mk8
Cables: 2x nbob KCY, 1 pair nbob actives, Darktrain 2 and 4 channel KCY extensions:
Preamps:    Schoeps VMS 02iub, Naiant Littlebox, Naiant IPA, Sound Devices Mixpre6
Recorders: Sound Devices Mixpre6, Sony PCM m10

Home Playback: Mytek DSD 192> McIntosh MC162> Eminent Tech LFT-16; Musical Fidelity xCan v2> Hifiman HE-4XX / Beyerdynamic DT880

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Re: Aerco MP-2 preamp - Part 2
« Reply #164 on: June 02, 2013, 09:46:22 AM »
"The gain range is 20-50db and is selected via internal selector switches that can be adjusted with a jeweler's screwdriver through the RCA outputs."

Yeah, that's handy ::)

As long as the a>d converter has adjustable gain, what's the problem?

clipping the output of the aerco (or the input of your ADC further down the line) is the one issue I see. If you have a reasonably close idea of how loud it's going to be then it doesn't matter, but if you have dynamic material or will be in a situation which is unfamiliar, then it could be an issue.
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