NEW iRIAA curve preamp boxes for sale!

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piaptk
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Location: Tucson, AZ
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NEW iRIAA curve preamp boxes for sale!

Post: # 37809Unread post piaptk
Wed Oct 07, 2015 12:26 am

Yo everybody, my good buddy, Max Gorbman (an electrical engineer by training) built me several iRIAA boxes, and I convinced him to put together some more for those of you who want a hardware preamp. It works great and I use them a lot! These are plug and play and ready to roll....



Image



(Pictured is desktop model with stereo summing option)

Presenting the Reference Lathe Preamplifier (RLP)

http://www.mxtrnx.com/reference-lathe-preamplifier.html

Placed between the signal source and amplifier, the RLP applies a precise inverse RIAA equalization curve for use with all types of record lathes, lacquers, etc. that will later be played back on a standard turntable. Compared to a parametric EQ, the guesswork is taken out of the process of finding the correct transition points in the curve. The RLP is optimized to apply a stable curve regardless of source or driving impedances, with minimal insertion loss, low noise and high headroom.

At 20 kHz, the RLP has a gain of about +6dB. At 1kHz, following the inverse RIAA curve, the gain is -12dB. Depending on the overall setup, this may require users to boost the signal or increase amplifier sensitivity to achieve the same perceived output. In most cases a modest adjustment is sufficient.

The RLP is comprised of two fully independent sections. It is suitable for both stereo and mono cutter heads. If both heads are mono, two heads can be fed signal independently at once directly from the RLP. A stereo summing option is available to facilitate mono operation.

The desktop model is housed in a steel slant face chassis. The circuit is constructed on a through-plated fiberglass PCB and all external components are chassis mounted. The power supply is fully isolated through an internal transformer, so only a non-polarized mains outlet is needed. The unit can be operated continuously with no duty cycle.

Do not use the RLP to drive an RIAA preamp directly. Without attenuation a line level signal will overload any phono preamp.

Specifications:

Input impedance: 10k ohm
Maximum input signal: 10V P-P @20 kHz
Maximum output level: 20V P-P @20 kHz
Power supply: Internal AC transformer, 18VDC dual output
Power input: 120V non-polarized mains plug (220V version available)
Channels: 2
Inputs: unbalanced 1/4” phone jack x2
Outputs: unbalanced 1/4” phone jack x2
Pilot indicator, mains fuse holder

Pricing:

Desktop model, fully assembled and tested $249
2U Rackmount model, with power switch $349
Stereo summing, add $49
Switchable, sums both inputs to both outputs. One input will go to both outputs, or a stereo signal is summed to mono and sent to both outputs.
Buffered gain controls, add $79*
A gain knob for each channel varies between fully muted up to an extra 12dB of available gain, buffered at the output to provide a consistent driving impedance at all gain settings.
Transformer balanced outputs, add $149*
Includes gain control plus transformer balanced XLR outputs and transformer buffered unbalanced 1/4” outputs. Ground lift switch provided per channel. Rated to same max output level specification.
Custom options available, inquire at automg-at-gmail-dot-com

* Only available with rackmount version

Desktop models available immediately starting 10/5/2015. Rackmount models built to order with a 5 week lead time maximum, depending on parts availability.

Available for local pickup near Tucson, AZ. Shipping to the continental US $20 per item. International shipping please inquire.
I Buy/Sell/Restore Vintage Machines/Parts and Provide Phone/In Person Tech Support
www.MichaelDixonVinylArt.com
www.LatheCutCamp.com
www.RecordLatheParts.com
www.MobileVinylRecorders.com
www.LatheCuts.com

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tragwag
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Location: Providence, RI USA
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Re: NEW iRIAA curve preamp boxes for sale!

Post: # 37822Unread post tragwag
Wed Oct 07, 2015 12:27 pm

that's great, nice little box there
making lathe cuts on a Presto 6N, HIFI stereo cuts on vinylrecorder
at Audio Geography Studios, Providence, RI USA
http://www.audiogeography.com

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dimi751
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Re: NEW iRIAA curve preamp boxes for sale!

Post: # 37889Unread post dimi751
Mon Oct 12, 2015 4:07 pm

nice one piaptik reasonable price too

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mxtrnx
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Re: NEW iRIAA curve preamp boxes for sale!

Post: # 37891Unread post mxtrnx
Mon Oct 12, 2015 6:46 pm

Hi, my name is Max and I'm the person who is building these. I got some really good guidance from Mike (piaptk) during prototyping, and I believe I've come up with something that performs well and is accessible to lathe operators on a budget. I'm happy to answer any questions.

I currently have a finished desktop model up for auction:
http://www.ebay.com/itm/Presto-Grampian-Record-Lathe-iRIAA-inverse-RIAA-preamplifier-filter-/262089460795?hash=item3d05bfcc3b

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dimi751
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Re: NEW iRIAA curve preamp boxes for sale!

Post: # 37935Unread post dimi751
Thu Oct 15, 2015 4:07 pm

Hi mike

Is there any way to provide some sampled sounds of cutted record
Using this iriaa ??

And an example if what cutted head was used

Dimi

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mxtrnx
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Re: NEW iRIAA curve preamp boxes for sale!

Post: # 38395Unread post mxtrnx
Fri Nov 06, 2015 8:22 pm

Hi, the first rack unit is being shipped soon, I just wanted to post a picture. I still have some desktop models that are built and ready to go. I've added new features to my offerings, VU meters and a heater supply, check out the website for details.
rlprack001front.jpg
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trailerparkjesus
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Re: NEW iRIAA curve preamp boxes for sale!

Post: # 47015Unread post trailerparkjesus
Thu Jun 01, 2017 6:04 pm

Are you still making these?

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Spiderxdeath
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Re: NEW iRIAA curve preamp boxes for sale!

Post: # 47030Unread post Spiderxdeath
Fri Jun 02, 2017 8:27 pm

Yes! I'm interested too....

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pandapolar
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Re: NEW iRIAA curve preamp boxes for sale!

Post: # 47038Unread post pandapolar
Sun Jun 04, 2017 6:34 pm

these are brilliant.. highly recommended!

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mxtrnx
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Re: NEW iRIAA curve preamp boxes for sale!

Post: # 47042Unread post mxtrnx
Mon Jun 05, 2017 2:46 pm

Hi all, thanks for the renewed interest. I am going to be available to make more of these around the middle of August and possibly sooner if things work out with regards to a move to a new city. I still have PCBs and parts for these and will be building to order, with a deposit. Like many (most?) of you I'm in this for the interest and enjoyment, and while I do wish to be compensated for my work I have tried to price these so that they are accessible to all levels of lathe operators.

I will post here when I'm back up and running.

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Spiderxdeath
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Re: NEW iRIAA curve preamp boxes for sale!

Post: # 47108Unread post Spiderxdeath
Tue Jun 13, 2017 7:52 pm

Is anyone else out there in troll land making these- I am in desperate need...

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chris king
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Re: NEW iRIAA curve preamp boxes for sale!

Post: # 47396Unread post chris king
Fri Jul 21, 2017 6:23 pm

DO YOU HAVE ANY OF THESE READY TO SHIP OR IS THERE A WAITING TIME ON THEM THANKS CHRIS

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Gridlock
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Location: eugene oregon

Re: NEW iRIAA curve preamp boxes for sale!

Post: # 47397Unread post Gridlock
Fri Jul 21, 2017 8:38 pm

Y splitter in a fancy box
<\\\\\\\\\\\\\\\\\\\\\[[[[[[[\/]]]]]]]\\\\\\\\\\\\\\\\\>
Recordette Sr.......Presto K-8

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mxtrnx
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Re: NEW iRIAA curve preamp boxes for sale!

Post: # 47599Unread post mxtrnx
Fri Aug 18, 2017 5:10 pm

Hi! Just wanted to let everyone know I am getting ready to build more of these and will be able to start shipping at the beginning of September. Full info and pricing is available at mxtrnx.com; prices are the same as original post.

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