Pro-Ject Audio

Pro-Ject MC step up box DS3 B

VAT included

Pickup available at The Barn

Usually ready in 24 hours

The MC Step Up Box DS3 B is a premium step-up transformer for moving coil cartridges, particularly suited to balanced turntable connections.

Read Lee's blog post here on what a step up transformer is and which one may be right for you.

Step-up transformers exist to passively increase the output level of a moving coil pick-up cartridge to a level like that of a typical moving magnet design. The level of gain achieved is defined by the winding ratio of the transformer. By making this initial gain phase entirely passive no extra power is required,and the audio signal can maintain its integrity. The further benefit is that less electrical power is now required from the phono stage, further allowing the signal to be freer of unwanted electrical noise. 

The MC Step Up Box DS3 B makes use of high-quality Lundahl LL1678 audio transformers to ensure every piece of musical detail is passed through to the phono stage. For further system compatibility it is also possible to select between RCA and XLR inputs and outputs as well as choosing between two transformer ratios depending on the level of gain required.

The MC Step Up Box DS3 B delivers remarkable clarity with minimal noise and distortion. Suited to both balanced and unbalanced systems, it is one of the most flexible step-up transformers available today. 

The new MC Step Up Box DS3 B is carefully designed and handmade in Europe. Our goal is to develop a technically flawless device in a housing that is only as big as necessary to safe raw materials. Due to the timeless design & rigid aluminium casework, the MC Step Up Box DS3 B is built for eternity.

Balanced XLR

Interference free

A balanced connection can extract the final musical information, effectively filtering out any noise from interferences stemming from our noisy, modern homes.

Lundahl LL 1678

High quality transformers

Lundahl transformers ensure highest sound quality and that every detail of your record remains.


Match your cartridge

Switch the in- and output & adjust the gain on the front. The cartridge impedance can be set on the back with a push of a button.

Made in EU

High-quality materials

The new Step Up Box DS3 B is carefully designed and handmade in Europe.

Frequency response 10Hz - 55kHz: +/- 1dB
Recommended load: 47 kOhm / 100pF
Transformation ratio: 1:16, 1:32
Input MC: 1x pair RCA phono sockets, XLR
Output: 1x pair RCA phono sockets, XLR
Dimensions WxHxD: 206 x 79 x 197 (209 with sockets) mm
Weight: 1740 g

Thank you for considering Yorkshire AV for your next investment in your AV or HiFi setup.

We are an approved retailer for all brands sold on our website, which means full manufacturers warranty and support as well as detailed product knowledge within our small business.

We use an inventory tracking system which states if item(s) are in stock and if not, what are the likely lead times.

Who do you use for delivery?

Our primary delivery agent is DPD. Where orders are shipped directly from Yorkshire AV, we always use DPD who offer a fabulous service at competitive rates.

If we drop ship (i.e. direct from the supplier) then the delivery agent is out of our control. It is generally DPD or UPS however - we rarely see other carriers used.

Selecting "Next Day" delivery does not mean you'll receive your item the next day in some cases. It's the next day from when the item(s) are in stock with us. If there is an urgent need then please contact a member of staff via the Live Chat or telephone (01757 826111) to check on live stock levels.

Certain product(s) are delayed in manufacturing due to semi-conductor shortages across the Globe. We'll keep you informed as to your order progress and a likely ETA once we get updates from the manufacturers.


Standard Returns 

Our returns policy lasts for 28 days for all items in our store except those defined in section (1) below.

To be eligible for a refund, your item must be unused/unopened and in the same condition that you received it. It must also be in the original packaging. If you return the item to us within 14 days of purchasing, you will be offered a full refund or exchange.

If your return comes to us after 14 days of purchasing and is opened, we will refund the full amount less 20%. Unused items returned up to 28 days after purchasing will be fully refunded.

It's the responsibility of the customer to return the items at your cost.

Yorkshire AV are able to arrange collection - please contact us for a quote.

You must ensure goods are shipped in their original packaging if they are damaged/not working.

Manufacturers will not accept returns and Yorkshire AV can not be held responsible for any damage in transit.

Several types of goods are exempt from being returned.

(1) Examples of non-returnable items: 

  • Gift cards HiFi Racks
  • Second hand units / clearance products
  • Headphones (due to listener hygiene)
  • Custom cables
  • Special order items (items that we order in for you/were not in stock at the time of order)

To complete your return, we require a receipt or proof of purchase. 

Please do not send your purchase back to the manufacturer. 

To start to return - please email us: along with your order number and we'll take it from there.

When will orders be dispatched?

  • Orders placed Monday - Thursday before 1pm and are in stock will be dispatched the same day for next day delivery. This relates to product that state 'In Stock for immediate dispatch' on the product page.
  • Orders placed over a weekend and are in stock will be dispatched on Monday.

Orders for items not in stock

Given the vast amount of variations of each product (e.g. AudioQuest cables) or Pro-Ject Audio Turntables - we keep the most common options in stock (i.e. gloss black finish, or 1.5m RCA cables) whereas longer cables or cables with terminations that are less frequently ordered will be ordered as required.

Generally speaking - we receive orders within 2-3 days for UK suppliers and 3-4 days for European suppliers (i.e. AudioQuest, DALI).

We want you to be 100% satisfied which is why we'll give you an email/call if item(s) aren't in stock and give you the option of changing the order, cancelling or if you're happy to wait a few days, we'll get it out as soon as possible.

If an item states 'Available to Order' - this means the item is not in stock but we are able to order in. Lead times average 2 days but in some circumstances, delivery times may be longer and is outside of our control. Please contact us to get an estimate on delivery times if orders are urgent. 


By default, our brands follow their standard manufacturers warranty terms and length.

For extended Warranty (should this be offered with your product), please ensure you complete the Extended Warranty registration form that was emailed to you.

Warranty claims within the warranty period are underpinned by the manufacturer. With any extended warranty claims - Yorkshire AV act as your agent to the authorised repair centre.

Shipping charges are excluded from any warranty claim. Original packaging and receipts must be provided else the claim will be rejected.

For any questions or issues - please contact us directly.

Financing your purchase

We’ve got you covered, as we have finance options available for people with varying circumstances. Yorkshire AV believes that you shouldn’t have to pinch your pockets to be able to purchase our products. You can pay in affordable monthly instalments to better suit your needs and budget.

To help you purchase from Yorkshire AV, we have partnered with Kandoo, a regulated credit broker to offer all our customers a range of highly flexible finance options. Kandoo is a comparison service that searches to find you the best Personal Loan option that’s right for you.

You can apply here - then continue your purchase from us.