Mesa/Boogie · Mark

Mark III

Three-channel evolution of the Mark circuit.

Catalogue code: MK-III HEAD
Years: 1985–1999
Type: head
Valves & speakers: 100W, 5 x 12AX7, 4 x 6L6GC, 2 x 6L6GC, 2 x EL34
Lifecycle: retired
Confidence: Medium

Specifications

Watts: 100
Speakers
Tubes: 5 x 12AX7, 4 x 6L6GC, 2 x 6L6GC, 2 x EL34
Channels

01 / Witnesses

What applies here

Marks that can be entered for this maker: Serial number (plate), Transformer code, Born-on / QA sticker.

02 / Bounds

The model year is a floor

Nothing predates 1985; components only push the date later.

03 / Value

What moves the price

Sold-listing reading: fair $1,676, good $2,600, excellent $3,494 USD · 5 sold listings (thin sample — indicative only) · as of 2026-10-14. the page also showed a 'See More' block of Mark IV / IIC+ / Quad listings which belong to other rows and were not used. Reverb exposes the price and condition but not the exact sale date, so asof = measurement date; no Fair/Poor sale observed; fair = lowest sold price in sample