M100 is the classic tube Monoblock Power Amplifier. Hand crafted in polished stainless steel. Circuitry by Michaelson & Austin (M & A). Volume control on the front  panel. Input, speaker connection, fuse and power on the back panel.

MENTMORE and PAPWORTH SHORT HISTORY

Anthony Michaelson and Austin produced in 70's  some valve amps, including the TVA1 and TVA10. Is generally accepted that M100 may also have been designed at this point too by Tim De Paravicini for Michaelson and Austin, hence TVA (Tim's Valve Amp.)

Unfortunately, Michaelson and Austin went broke. Michaelson went on to found Musical Fidelity and the M&A designs (including the De Paravicini designs) were sold on to Mentmore, a company founded by a London Borough, to provide work experience and training.

Successively  the whole equipment  was acquired by Papworth Audio Technology, which is a group of companies associated with the Papworth Hospital Trust, based in 32 Fendon Road, Cambridge, CB1 7RT. They produced still their own TVA10 and M-100  but also new amplifiers like TVA50, TVA10i (an integrated version of TVA10),  M-200 (EL34 200w mono ampli),  M-300 (KT88 300w mono ampli), PPA6 (dual mono valve pre-amp), MVH-200 (a "mosfet" Valve Hybrid' 200w Integrated, also available as a power amp version, MPA-200). Except for TVA50, all of the above are manufactured in heavy gauge mirror polished stainless steel. Lately Papworth introduced  the "Burgundy" series, characterized by a nice Burgundy powder coated steel case. Their products  have a reputation for very high quality.

LINK

- http://forum.audiogon.com/cgi-bin/fr.pl?aamps&1248806895

- http://www.hifiwigwam.com/showthread.php?18820-Papworth-M100-Power-Amps

M-100 SPECIFICATIONS *

Power Output 100W RMS

Frequency Response 14Hz-30Khz (+ 0.2dB)

Signal to noise ratio -95dB

Total Harmonic Distortion < 0.18 % at 1kHz, 100W

Input Sensitivity 650 mV

Output Impedance 4, 8 or 16 ohm

Tube complement 4 x EL34 -  3 x ECC83  or (1) ECC81 and (2) ECC83

Dimensions 250mm x 380mm x 170mm

Net weight 21 Kg

* from PAPWORTH AUDIO TECHNOLOGY

Are available on request schematics, bias reset and voltage measurements.

Sono disponibili a richiesta lo schema e le istruzioni per la regolazione del bias e per la misura delle tensioni.

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