Fisher X-04

The Fisher X-04 is a stereo tube integrated amplifier. Not much about it is documented, but what exists points to a well-regarded model. Vintage Audio Online describes it as "widely regarded as the best of the early Fisher integrated amps," and it remains "a highly sought-after amplifier" on the collector market. Owners quoted by The Music Room praise its "rich, warm sound that projects the classic tube experience."

Surviving information on the X-04 is thin. No production years, original price, or dimensions have been found. The circuit is known. It uses an EL84/7189 amplifier topology, with two 12AX7 preamp tubes and two pair of matched 7189A output tubes (six tubes total), and a solid-state rectification power supply. It was designed for use with 8-ohm speakers. Owner accounts add one caveat: the amplifier is very heavy, but the chassis and controls are "fairly flimsy." Watch for that on any surviving unit.

The record conflicts on power output. hifi-wiki.com and an eBay listing both state 32 watts per channel, while Vintage Audio Online claims 40 watts per channel. With the sources split, this page gives no definitive figure.

Type: Stereo tube integrated amplifier
Tubes: 2 × 12AX7, 4 × 7189A
Rectification: Solid state
Load: 8-ohm speakers