About Us

Family owned in Seattle, we treat each customer like a part of our family.

Combining Artistry and Technology Since 1967

Don Mills began playing guitar in 1962; through a tube amplifier.  He built his first tube amplifier in 1967, and the rest is history.

Our Story

Don Mills is the owner and builder at Golden Phi Amplification. He built his first amp in 1967, and has been honing his craft ever since. When he isn’t designing and building amps, he can be found playing around Seattle with his band, Durable Goods. He enjoys playing through his Gold Nugget, a 5E3 Tweed Deluxe style amplifier. It goes to 12.



About Golden Phi

The Golden Phi, represented by the Greek letter “Phi”, is also known as the golden ratio: 0.6: 1.0: 1.6.  This ratio inspired the speaker cabinet dimensions as it delivers both excellent visual and artistic appeal as well as extraordinary vintage acoustic sound. It is truly the gold standard.



Don Mills, Owner/Builder
6559 6th Ave NW
Seattle, WA 98117