United Studio Technology Replay Box

While typical DI circuits are simple, the very best depend on great transformers — and this is where the Vintage Direct excels.. The design of Vintage Direct was inspired by the earliest hand-wired DI boxes, such as the Wolfbox and Bruce Swedien’s Bass Box, both of which used massive early transformers made by Triad, UTC, and others.

Our research began with the UTC A12 transformer, first manufactured in the early ‘60s. Several original transformers were measured to accurately reproduce their winding ratios, bobbin and magnet wire type, and lamination style.

We spent years exploring many versions of this design, experimenting with different winding ratios and alloys; we ultimately settled on a high-nickel lamination and a winding ratio very close to the classics that inspired us. The result: United’s US-made 5078 — one of the largest transformers you’ll find in a DI. It delivers a pristine low-noise signal, wide frequency response, extraordinary headroom, and outstanding noise rejection.

US and EU parcels ship via UPS, ETA 1-7 working days from pickup day zero. That also applies to most locations worldwide.

All shipments are fully insured.

Bigger shipments requiring pallets or custom made crates ship to US, CA, JP, CN, AU and other outside of EU locations via DHL Air Freight, ETA is normally approx. 7-14 working days from pickup day zero.

Big shipments inside EU ship via different freight companies, recently mostly via ACE Logistics. Freight forwarders can use different courier companies for deliveries to final destinations.

Palletising and crating time can vary depending on the size of the shipment and packaging queue. We pack all our shipments with great care.

You are most welcome to pick your order up yourself from our Retrosonic Pro Audio showroom, studio and warehouse in Tallinn, Estonia.

We ship worldwide – contact us for a personal shipping quote or any other questions.

VAT (Value Added Tax) can be deducted if you have a company with a valid EU VAT number or if you're based outside of the EU. Non-EU buyers pay all and any import tax and duty as regulated by their local customs.