412 MARS '67-Pre-R

The Marshall™ 1960A is the slant-front 4×12 cabinet — the angled-baffle "A" version designed to sit on top of a 1960B straight cabinet to form the classic Marshall stack. This particular example is from 1967, identifiable by its pinstripe grille cloth: the distinctive narrow-check pattern Marshall used in the mid-to-late 1960s.

The Speakers — Thames Ditton, 30 March 1966

Inside the cabinet are Celestion™ G12M20 Greenback 12-inch speakers, dated 30 March 1966, made at the original Thames Ditton factory in Surrey, England. The cones carry the Pulsonic 102/003 stamp, identifying them as the 75Hz "lead" cone variant fitted to the T1221 model. The labels read 15Ω — the original pre-1968 marking, used before Celestion standardised to 16Ω. Power handling is the original 20 watts, the specification that preceded the 1968 move to 25W.

Why Pre-Rola Matters

"Pre-Rola" denotes Greenbacks produced at Thames Ditton before Celestion's transition to the ROLA factory in the early 1970s. The move was not just a change of address — it brought new tooling, new cone suppliers (Pulsonic gave way to Kurt Mueller), and a gradually different sonic signature.

Pre-Rola Greenbacks remain the most prized members of the entire Celestion vintage family: a softer, vocal midrange; a creamy compression as the speaker breaks up; and a top end that never turns harsh. Surviving examples with original, unrepaired Pulsonic cones are now genuinely scarce — most have been reconed at least once over six decades, and reconed Greenbacks, even with period-correct cones, never quite recover the original voice. A 1967 pinstripe cabinet still loaded with 1966 originals is, at this point, a museum-grade configuration.

The Undoped Cone

Celestion began applying cone doping — a damping compound brushed onto the cone to smooth the upper midrange — to the T1221 around March / April 1966. The cones in this cabinet, dated 30 March 1966, are undoped: produced in the final weeks of the original raw-cone specification, retaining the rawer voice of the early Greenback before Celestion smoothed it out.

Historical Context

The G12M20 in a 1960 cabinet was the engine of late-1960s British rock — the platform on which Hendrix, Clapton, Beck, and Page built the vocabulary of the electric guitar. The pinstripe-era 1960A loaded with 20-watt Pre-Rola drivers represents the exact configuration heard across that period: the years when Marshall amplification went from a London phenomenon to the global standard.

What This IR Captures

This IR preserves the tonal fingerprint of an exceptionally rare cabinet: a 1967 pinstripe 1960A loaded with four undoped, Pulsonic-cone, 20-watt Pre-Rola Greenbacks on their original 15Ω labels — recorded to preserve the natural midrange weight and warmth this combination is known for, without colouration, without enhancement.