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Author Topic: E.A.A. PSP-2 - Brochure / Specifications / Photos / Information  (Read 2312 times)

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Online audBall

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« Last Edit: April 13, 2019, 08:24:09 PM by audBall »
akg ck61/62/63/77(c577)|naiant.pfa, dpa smk-sc4061 
lunatec v2, mma-a d:vice, mma-6000
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Online audBall

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Re: E.A.A. PSP-2 - Brochure / Specifications
« Reply #1 on: April 10, 2019, 10:37:01 PM »
I was searching the site for a dedicated PSP-2 thread and found a number of really informative posts sparsely placed all around.  I understand that much of this might be common knowledge to those familiar with this preamp over the years, but since there doesn't appear to be a central thread I have compiled relevant info here.


Preamp Specifications (see attached publication for additional detailed specs):
 - XLR in/out
 - 1/8-inch (3.55mm) stereo in/out
 - 12V, 24V (internal switching), and 48V phantom powering
 - Mic/Line input
 - 5-9 (max) VDC powered by external battery
 - 6xAA batteries internal power
 - Approximate runtime (with 48V phantom power):  10 hours
 - Gain range: see tedyun's post below from 2011
 - Dimensions: 3.4 x 1.4 x 5.6 inches (85 x 35 x 147 mm)

---

Link to manual:
http://www.taperssection.com/reference/pdf/Manual_EAAPSP2.pdf

---

Gain ranges:
The gain ranges I estimated were pretty close.

I set up my computer to generate a steady tone, then from my DAC (Headamp Pico), I fed an unbalanced signal to my V3, and then SPDIF out to my PMD-661. I adjusted the signal to a specific level on the meter using the gain and the trim on the V3. Then I placed the PSP-2 between the DAC and V3 and measured the signal increase. I used the balanced outs on the PSP-2.

Mic sens "-35": gain of +28 (ie., the meter increased from -40 dB to -12)
Gain switches +6 and +12 add +6 dB and +12 dB respectively.

Mic sens "-55": gain of +48 (the meter increased from -60 to -12)
Gain switches +6 and +12 add +6 dB and +12 dB respectively.

Mic sens "-70": gain of >+60 (the meter increased from -60 to "over"; I adjusted the trim on the V3 downwards by 4 dB, and it was right around 0, so I estimate that it adds about +65 dB)

That's the best I can do with my equipment I have on hand.

So the revised gain range for the PSP-2 is:

+28 (Mic sens: "-35"; Gain "0")
+34 (Mic sens: "-35"; Gain "+6")
+40 (Mic sens: "-35"; Gain "+12")
+48 (Mic sens: "-55"; Gain "0")
+54 (Mic sens: "-55"; Gain "+6")
+60 (Mic sens: "-55"; Gain "+12")
+65 (Mic sens: "-70"; Gain "0")
+71 (Mic sens: "-70"; Gain "+6")
+77 (Mic sens: "-70"; Gain "+12")

So there probably is a pretty big margin of error and it would be nice to get an actual number for the peak value instead of estimating it by eye. I would say +/- 5 dB. I tried feeding the signal to another computer but couldn't really get the digital in or line in to work.

---

Powering via 5V USB rechargeable battery:
http://taperssection.com/index.php?topic=87410.msg2159638#msg2159638

Powering via internal NiMH batteries:
http://taperssection.com/index.php?topic=163699.msg2051946#msg2051946

Replacement battery sled:
https://www.amazon.com/Philmore-Battery-Holder-Standard-Connector/dp/B000LFVFU8

---

Bench tests performed by Vark:
http://taperssection.com/index.php?topic=153128.msg1938497#msg1938497

---

Information regarding repairs:
http://taperssection.com/index.php?topic=167656.msg2088213#msg2088213
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 fobstl

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Re: E.A.A. PSP-2 - Brochure / Specifications
« Reply #2 on: April 11, 2019, 11:02:37 AM »
As someone who has used a PSP2 for over 20 years, thanks for starting a thread.

Offline MakersMarc

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Re: E.A.A. PSP-2 - Brochure / Specifications
« Reply #3 on: April 11, 2019, 01:59:02 PM »
I loved mine wish so still had it. But I moved to an Oade m148 so hard to complain. 😀
😈 Mk4v/41v>nbob actives>Baby nbox>Oade warm mod Marantz 620.

Open: 4v/41v>nbobs>Nicky mod Naiant PFA>Oade warm mod 661.

Home: the Stereo Hospital budget refurb rig: Lappie>DragonFly Red with Jitterbug>Nikko NR520 amp>B&W V202 speakers. Hi Fi Goodwill style.

Online audBall

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Re: E.A.A. PSP-2 - Brochure / Specifications
« Reply #4 on: April 13, 2019, 01:52:36 PM »
Bump for internal photos link in the top post.

Second photo, on the left, the red/blue switch is one of two (the other is out of view below).  These are for switching between 24 and 48 volts phantom powering.

In the top left of the board, what are those trimpots for?  Would these be for input (or output) finer gain adjustments?

It's truly amazing how compact and tightly put together this preamp is.  I would have taken a picture of the other side, but it's basically just a metal wall that extends beyond the battery compartment.  It appears there are three total boards, all facing in towards one another in a sandwich.   
« Last Edit: April 13, 2019, 03:17:59 PM by audBall »
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 inoutoffocus

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Re: E.A.A. PSP-2 - Brochure / Specifications
« Reply #5 on: April 13, 2019, 04:59:02 PM »
Thanks for starting thread and posting pics. Anyone running there's on a 5v usb battery? When I set mine up that way with fresh charge, low level battery light flashes  as soon as you power the unit on. Haven't run any tests this way. Any thoughts? The usb battery can do 5-12v but it senses voltage automatically, no way to set voltage you want. Weirdness

Offline tedyun

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Re: E.A.A. PSP-2 - Brochure / Specifications
« Reply #6 on: April 14, 2019, 04:15:08 PM »
I've been using a USB battery to power my PSP2 for the longest time. I've used a variety of packs, from the older ones that supply 5V, 500 mA, to the newer ones that supply around 2 A per port.

Check if it's your battery. Try powering the PSP2 by using the same cable plugged into your computer. If your battery is fine (ie., it can charge other devices like a phone), it might also be the cable too. Worst case scenario is if it's the preamp. Then you'll have to send it in to get checked out.

Do you have any way to measure if the PSP2 is supplying the correct voltage to your mics (ie., a multimeter?)


Thanks for starting thread and posting pics. Anyone running there's on a 5v usb battery? When I set mine up that way with fresh charge, low level battery light flashes  as soon as you power the unit on. Haven't run any tests this way. Any thoughts? The usb battery can do 5-12v but it senses voltage automatically, no way to set voltage you want. Weirdness
Mics: B&K 4011, Schoeps MK5 (Nbobs, Naiant PFA), Busman BSC-1 (K11/K21/K31/K41 caps), Church CA-14 (o, c), Church CAFS, Core Sound Binaurals
Pre: EAA PSP-2,  Lunatec V3, Nbox-Platinum, Church CA-9200
ADC: Mytek 192 ADC, Oade Mod SBM-1
Rec: Oade Supermod PMD-661, Tascam DR60D, M-Audio MicroTrack II, Korg MR-1 (32GB SSD mod); Sony PCM-M10, Edirol R09HR; iRiver HP-120
Photo: Canon 5D3, Canon EF-S 17-55mm f2.8, Canon EF 35mm f1.4L Canon EF 24-70 f2.8L MkI, Canon EF 70-200mm f2.8L IS MkI, Canon EF 50 mm f1.4, Canon EF 50 f1.2L, Canon EF 300 f/4L IS, Canon EF 100-400 f4-5.6L IS MkI
Video: Canon HF100

Online audBall

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Re: E.A.A. PSP-2 - Brochure / Specifications
« Reply #7 on: April 17, 2019, 12:18:03 PM »
In addition to my trim pot question above, has anyone ever experienced a difference in output levels (via XLR and 1/8” stereo outs)?  This occurs with both mic and line-in sources, with output gains set to 0 dB.
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 inoutoffocus

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Re: E.A.A. PSP-2 - Brochure / Specifications / Photos / Information
« Reply #8 on: April 17, 2019, 05:21:24 PM »
I'm not 100% sure, but I think the mini out isn't as hot as the xlr outputs. And I checked my usb battery output. It was 5.2v. Light still flashes on psp2. Talked to VARK audio and they didn't really have an answer for me. Cable I'm using is a short right angle usb to power cable. Seems they designed to pre to run at 9v optimally thus the 6aa battery sled. Might hook up rig tonight and record to see if there's any audible noise with low batt light flashing. Wish I could find a tiny 9v usb battery or one that you can adjust output manually. Mine senses voltage automatically and adjusts.
« Last Edit: April 17, 2019, 05:35:34 PM by inoutoffocus »

Online audBall

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Re: E.A.A. PSP-2 - Brochure / Specifications / Photos / Information
« Reply #9 on: April 17, 2019, 05:38:19 PM »
Woops, I should clarify. I meant a difference in levels between channels L and R. This difference in channel outputs is reflected on both XLR and 1/8” outputs. My right channels are significantly hotter.

You are correct that an overall difference would be expected between the 1/8” (unbalanced) and XLR (balanced) outputs.
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 perks

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Re: E.A.A. PSP-2 - Brochure / Specifications / Photos / Information
« Reply #10 on: April 17, 2019, 06:55:48 PM »
Woops, I should clarify. I meant a difference in levels between channels L and R. This difference in channel outputs is reflected on both XLR and 1/8” outputs. My right channels are significantly hotter.

You are correct that an overall difference would be expected between the 1/8” (unbalanced) and XLR (balanced) outputs.

I have a set of 48V PFA's that output L/R differently by a very noticeable amount but not my PSP2. They seem pretty even to me. I love this pre too. My new favorite thing about it is running the XLR outs to the AD2K+ and also running a M10 off the 1/8 out. Just so easy to have a backup now that takes up virtually no additional bag space.
Mics: Schoeps MK5, Schoeps MK41, AT853u (C,SC,H,O), DPA 4061
Preamps/converters: Schoeps VMS52UB (x2), Nbox (x2), E.A.A. PSP-2 (x2) Grace Lunatec V2 (for sale), Sound Devices MP-2 (for sale), DPA MMA6000, Naiant Tinybox v1.5, Naiant PiPsqueak, Church Ugly, Apogee Mini-Me, Benchmark AD2k+
Recorders: Tascam DR-680, Korg MR-1, Edirol R-05, Sony PCM-M10 (x2), Tascam DR-07, Marantz PMD-661, Sound Devices Mixpre-3

Offline fobstl

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Re: E.A.A. PSP-2 - Brochure / Specifications / Photos / Information
« Reply #11 on: April 17, 2019, 07:24:13 PM »
I like to run the 1/8" out into an M10 as backup also. No brainer to do.

 

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