Brand: Bob's Devices


Bob's Devices Integrated VPI CineMag 1131 MC Step Up Transformer (1:20/1:40 RCA)

Availability: Discontinued
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Specifically created to improve the performance of your VPI turntable! You will hear the magic!

Bob's Devices MC Step Up Transformers are Hand-Made upon order and are ready to ship in approximately 1-2 weeks!

Will this work with my MC Cartridge? We can answer that! Simply let us know what Cartridge and Phono Preamp you have and we'll do the rest! Email or call us today at: or 800-782-3472.

This fully integrated Step-up Transformer/VPI Interface Box was specifically created to improve the performance of your VPI turntable. When used with a low output Moving Coil Phono Cartridge, the Integrated VPI CineMag 1131 replaces the standard VPI Interface Box with a unit that combines the top of the line Bob's Devices exclusive "Blue Series" CineMag 1131 Step Up Transformers with the VPI Interface Box.

The Integrated VPI CineMag 1131 eliminates a set of interconnects and connectors in the phono playback circuit. The path between the moving coil cartridge and the phono preamplifier is as critical as it is sensitive due to the low voltage and current being transmitted. Further, this path is also subject to RF and other interference. You will hear the difference by streamlining this path: "The fewer the stones in the road, the smoother the ride."

Boost your MC cartridge with the natural sounding MC Phono Step-Up Transformer from Bob's Devices! The hand crafted CineMag 1131 MC Step-up Transformer (SUT) is perfect for those extremely low output cartridges! All lettering is laser etched and included is a switchable premium construction, C&K Brand Silver contact toggle switches from high to low gain, deluxe gold plated RCA jacks and ground/lift.

Recommended Step-Up Ratio Based on Internal Impedance and Output Voltage of Cartridge

Voltage (mV) 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55 0.6 0.65 0.7
Internal Impedance (Ω)
5 40 40 40 30 30 20 20 20 15 15 15 10 15 10 10 10
10 40 40 30 20 20 20 20 15 15 15 15 10 10 10 10
15 40 40 30 30 20 20 20 20 15 15 15 15 10 10 10 10
20 40 30 30 20 20 20 20 15 15 15 15 15 10 10 10 10
25 30 30 20 20 20 15 15 15 15 10 10 10 10
30 30 30 20 20 20 15 15 15 15 15 10 10 10 10 10
35 30 30 20 20 15 20 15 15 15 15 15 10 10 10 10 10
40 30 30 20 20 15 20 15 15 15 15 10 15 10 10 10 10 10
45 30 20 20 15 15 15 15 15 10 15 10 10 10 10 10

This chart (based on using MM inputs with 47k Ohms impedance setting on phono stage) is not accurate for Denon Cartridges.

Note: Where 2 numbers appear, either can be used.

Why would you buy a step-up transformer instead of just sticking with a high-gain phono preamp? Because, with exceptions, transformers offer better sound--providing more drama, more color, and, especially, greater touch and impact.
-Art Dudley,, Febuary 2017

The CineMag 1131 SUT features newly designed ultra high quality laminations, lower inductance and superior sound! The transformers for the CineMag 1131 SUT were specially designed and tested with several low-output moving coil cartridges. These are very difficult transformers to construct and require a precision manufacturing process that can only be done by David Geren at CineMag.

These specially designed transformers are wired to connect a moving coil cartridge (on a turntable) to a phono preamplifier, phono input of a receiver, or your preamp's phono input. The 1131 is switchable for 1:20 (26dB) or 1:40 (32dB).

The grander point, of course, is this: If you own an Ortofon SPU or similar low-output MC cartridge and you're looking for a giant-slayer of a step-up transformer, this may be the product you've been waiting for. The Bob's Devices Sky 40 won't make serious phonophiles forget all about the Hommage T1--or the Audio Note AN-S8, or the Western Electric 618B, or any of the other transformers that might lay claim to the title The Best--but it will give hobbyists of less-than-extravagant means a chance to wring even more enjoyment from their favorite records.
-Art Dudley,, Febuary 2017
In listening to the Cinemag Sky 30, I was distinctly aware that this device is not an emotional instrument. It is, rather, a transparent, analytical, and musical device that reveals a tremendous amount of information in the details of a recording. The Cinemag Sky 30 is extraordinarily good at opening up a soundstage and placing instruments within that space with a clear sense of the air around them. Imaging, detail retrieval, intimacy, resolution are all qualities the Cinemag Sky 30 has in spades. With multiple versions (Sky 20 and 30), it offers versatility for use with many different cartridges and phono stages....I would highly recommend Bob's Devices Cinemag Sky 30 if you have the budget to accommodate it within your overall financial allocation.
-Eben Field,, November 2015

Construction Techniques

All connections are Resistance soldered using the American Beauty system which avoids heat damage to the delicate insulation on the hair-like wires of the transformers. Test equipment is very low current to avoid saturating the transformer cores. You can count on a premier product that is state-of-the-art.

This unit includes a grounding post that can be used to connect your turntable ground and your preamplifier ground. It also includes a ground "lift" switch. In all modes, the transformer cases and faraday shield internal to the transformers are connected to the ground screw. In the "ground" mode, the phono system minus sides (negative sides) are connected to the grounding lug. This configuration works well for those systems where the turntable ground is connected to the negative leads coming from the phono cartridge or where the negative inputs to the preamp are internally connected to ground. In the "lift" mode, none of the conductors in the RCA jacks are connected to the case, ground, or shield and there is no electrical connection between channels. This design allows you much flexibility to mitigate for ground loops regardless of the configuration of your other equipment.


  • Switchable for 1:20 (26dB) or 1:40 (32dB)
  • RCA Connections
  • Detailed Installation Instructions

Special Note: Please allow 1-2 weeks for order fulfillment.

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