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U280sc

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Margules Audio

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Views: 7590
Last update: 2008-01-31

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Class-A Output Stage & Active-Servo Bias
Vacuum tube power amps with class-A outputs are rare. Class-A operation causes the tubes to run quite hot, and increases the chance of saturating the output transformer.
Margules has gotten around this problem by incorporating Active Servo Bias (patent pending). The bias actively tracks in input signal, permitting full class-A output, without overdriving the tubes.
Active Servo Bias also sets DC bias and AC drive levels, assuring optimum electrical and sonic performance. Throughout the useful life of the output tubes, no drive or bias adjustments are ever needed. New tubes can be installed without test equipment or a time-consuming setup.
Active Servo Bias also makes it possible to use a variety of output tubes. The 6550, KT88, KT99, or KT100 can be interchanged without modification.
Active Servo Bias is implemented with semiconductors designed for the aerospace industry, assuring long, trouble-free operation.

Ultralinear/Triode & Strapped Operation
Audiophiles have

Specifications > Amplifier > U280sc
Manufacturer	Margules Audio
Model name	U280sc
Kind of amplifier	Power amplifier
Type	Tube
Number of channels	2
Class	A
Per channel power output	35 Watts
Output impedance	4 Ohms
Total Harmonic Distortion (THD)	0.15 %
Signal to noise ratio	83 dB
Power consumption	530 Watts
Frequency response	from 20 Hz to 55 kHz
Number of inputs	1
Source direct	Yes
Balance	Yes
Treble / Bass	No
Loudness	No
Source selector	No
Standby mode	No
Remote control	No
Phono input	No
Available front panel colors	black
Available front panel materials	acrilic/metal
Weight	35 kg
Suggested retail price	3500 USD
Product review URL	http://www.stereotimes.com/amp010308.shtml
Product review URL	http://www.soundstage.com/revequip/margules_u280sc.htm
Product review URL	http://www.soundstageav.com/onhifi/20060201.htm
Product review URL	http://www.audioweb.com/Review/ReviewSearch.asp?searchtype=M&companyid=1143
Manufacturer's product URL	http://www.margules.com.mx/home.htm
U280sc > Margules Audio

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