What tubes does the Mesa/Boogie Mark IIC+ use?

The Mesa/Boogie Mark IIC+ uses 5× 12AX7 (lead/clean preamp cascade), 4× 6L6GC (power tubes (class a/b simul)).

What power tubes does the Mesa/Boogie Mark IIC+ use?

The Mesa/Boogie Mark IIC+ runs 4× 6L6GC in the output stage. Voltage-compatible alternatives include 5881, EL34 (with rebias) (always re-bias before swapping).

Can I swap the 12AX7 tubes in a Mesa/Boogie Mark IIC+?

Yes — the 12AX7 preamp tubes in the Mark IIC+ are user-replaceable and tolerate tube rolling without bias adjustment. Common rolling alternatives: ECC83, 5751 (V1 only). Preamp tube changes are the cheapest way to alter the amp's character.

How much power does the Mesa/Boogie Mark IIC+ produce?

The Mesa/Boogie Mark IIC+ produces approximately 60 W or 100 W of guitar-amp output. Era: 1983–1985.

Tube chart · Guitar amp

Tubes for Mesa/Boogie Mark IIC+

Era: 1983–1985Power: 60 W or 100 W

The Mark IIC+ defined high-gain American lead tone — Metallica recorded "Master of Puppets" through it. Five cascaded 12AX7 gain stages, simul-class operation switchable between Class A (60 W) and Class A/B (100 W). The five-stage cascade is brutally sensitive to V1 tube choice.

Complete tube line-up

Every socket in the Mark IIC+, with stock tubes, direct-swap alternatives, and rolling notes. Tube names link to dedicated specification pages.

Lead/clean preamp cascade × 5
12AX712AX7 / ECC83
Alt:ECC83, 5751 (V1 only)
Power tubes (Class A/B simul) × 4
6L6GC
Alt:5881, EL34 (with rebias)
Rectifier (solid-state)
Solid-state (no tube)

Important: bias before you swap

Power tube swaps almost always require rebiasing — running a new quartet of 6L6GC cold or hot will shorten tube life dramatically and can damage the output transformer. See the biasing guide and the troubleshooting guide before rolling tubes.

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