#Mark levinson no 334 repair manual how to#
#Mark levinson no 334 repair manual upgrade#

Two weeks later, Madrigal shipped me a full production model (serial no.1252) that differed only in the addition of two diodes to its soft-clipping circuit. Loosing exposed printed circuit board trace is hard to repair because it requires extremely. Setup I began listening the day the first No.334, a pre-production model (serial no.1194), arrived.

#Mark levinson no 334 repair manual upgrade#

Because Madrigal attributes much of the No.334's sonic improvements to the new boards, they are available as a dealer-installed upgrade kit to No.331-333 owners for $1950 (see sidebar). ' The two avocado-green cyanate-ester voltage-gain (VG) PCBs that lie just under the 334's top cover cost Madrigal 10 times more than the No.331's original dark-green fiberglass VG boards. Madrigal's David Nauber explained that if the dielectric constant is too high-as it is with fiberglass-the PCB signal traces, separated by dielectric configuration, can store energy like a capacitor and cause the circuit board 'to sing along with the music. These PCBs have a lower and more stable dielectric constant, resulting in better electrical isolation of circuit stages and improved sound.

#Mark levinson no 334 repair manual how to#

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The No.334 includes the exotic 'S'-series printed circuit board material-a cyanate-ester composite-used in Madrigal's Reference No.33 and No.33H amplifiers. The circuitry includes two triple-bypassed, 44,000в™џ, low-ESR electrolytic filter capacitors per channel a soft-clipping circuit to reduce the audible effects of amplifier clipping or overload adaptively biased output stages that are intended to provide much of the benefits of class-A operation without generating huge amounts of heat and independent regulation of all voltage gain-stages. Briefly, the dual-mono configuration features large independent power supplies with two 801VA toroidal transformers, one for each channel, oriented to cancel stray magnetic fields and balanced circuit technology derived from the No.33 and No.33H reference monoblocks. Space doesn't allow a full description of the design features shared by the Nos.331 and 334 for that, consult the original review in Vol.19 No.1.