Quad II Tube Amplifier

The Quad II is a classic mono valve power amplifier built for the kind of smooth, accurate reproduction that made early Quad systems so respected.

Designed to partner with the Quad 22 control unit, it delivers stable performance that remains largely unaffected by load or signal conditions, helping it work well with a wide range of loudspeakers. Its thoughtful design, long-term reliability, and use of standard commercially tested valves made it a practical and refined choice for serious home listening.

Serviced, tested, and fully functional. All valves have been checked and are in good working order. Fitted with vintage Mullard EF86 preamp valves, 2 x G.E.C. KT66 power valves, and a Mullard GZ32 rectifier valve.

For a full Quad experience, these Quad II monobloc amplifiers can be paired with Quad 22 preamplifiers.


Serial No. #7303.

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.