ResonantLive Sound Archive

Equipment file · Valve PA amplifier

PA 100 amplifier

Marshall · 1965–1967

Evidence status · documented

Identity and core specifications are documented; some historical fields remain unavailable.

Marshall's 100-watt PA amplifiers grew from the same development as its first 100-watt guitar amplifier, built in 1965 at Pete Townshend's request. The Master P.A. 100 combined six-channel mixing with four EL34 output valves and five ECC83s.

Introduced
1965–1967
Category
Valve PA amplifier
Intended use
100-watt PA amplification sharing Marshall's guitar-amp circuitry
Production
Marshall, UK

Equipment photographs · 1

1970 Marshall JMP 1968 Super P.A. 100W - Phase splitter and power supply stage (1999-06-10 13.17.38 by germanium)

1 / 1 · 1970 Marshall JMP 1968 Super P.A. 100W - Phase splitter and power supply stage (1999-06-10 13.17.38 by germanium)

1970 Marshall JMP 1968 Super P.A. 100W - Phase splitter and power supply stage (1999-06-10 13.17.38 by germanium)·germanium from Eichwalde, Germany·CC BY 2.0

Why it mattered

  1. 01

    It came from the push to 100 watts that let bands be heard in larger rooms.

  2. 02

    It carried Marshall's loud, road-tough valve design into vocal PA.

Engineering record

Power
100 watts[1]
Valves and mixing
Four EL34 with five ECC83, six channels with echo send/return[1]
Origin
Derived from the first 100-watt Marshall circuit, built in 1965 for Pete Townshend[2][3]

Original pricing

No reliable period price located

2026 equivalent

Not calculated without a reliable original price.

Public price evidence was not sufficient to publish a defensible original figure.

Use in the field

No named deployment could be tied to this exact item by a checked source yet. Know of one? Suggest it on the contribute page.

Manuals & original documents

No authoritative manual or original document has been located for this profile.

Sources

  1. 1Master P.A. 100Radiomuseum.org · reference
  2. 2Lust for PowerPremier Guitar · reference · 2013-11-28
  3. 3The Evolution of the 100W CircuitAmp Archives · reference · 2019-10-12

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