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Abrahamsen SA-1 czyli The 2 Channel Audio Power Amplifier


mateuszek

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gdy rozeszly sie drogi abrahamsena z electrocompaniet konstruktor odnowil swoj pierwszy projekt "The 2 Channel Audio Power Amplifier"

 

orginal mial 25watow w klasie A

 

o nastepcy 25cio watowca konstruktor pisze skromnie:

 

The 2 Channel Audio Power Amplifier

With today's quality parts and the improvement of the original design, this amplifier will again set a new industry standard, just as the original did. To extend the quality of this product as much as possible, several features have been built into the concept.

 

All transistors are matched to further reduce the distortion.

Only high current, high temperature low impedance capacitors are used. This current reservoir is made up from different sizes of capacitors in parallel, to create a supply as linear as possible for all frequencies.

 

A “clamp” is holding these capacitors, forcing them together to remove any internal movement of the electrolytic so that the well known “micro phonic” effect is avoided.

 

 

Dynamic Specifications Static Specifications

40 Amp continuous current Input sensitivity 1.0V

200 Amp peak current THD (half power) 0.02%

TIM 0.001% THD (-1dB) 0.02%

DIM 0.001%

Slew rate 100VuS Weight(kg) 20

 

Frequency response (-3dB) DC to 1MHz

25W into 8 Ohm, 45W into 4 Ohm, 90W into 2 Ohm.

Width 400mm Depth 410mm Height 180mm

 

Will drive loads down to 0.5 Ohm.

All measurements are made with main voltage 120/240 V 50Hz / 60Hz.

 

mialem okacje sluchac tego malenstwa z loganami - te 25 watow bez problemu dawalo rade

w planach konstruktor mial rowniez nastepce dedykowanego pre - niestety nie wyszlo to poza probe testow

 

mial ktos z kolegow z ta konstrukcja blizej do czynienia?

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Electrocompaniet quoted the input sensativity as 400mv for the 25 watt output. The gain is quoted as 36x (31db).

Nominal input impedance ik ohm and recommended source impedance below 50 ohms.

Output impedance at 1k ohms 250m ohms with a damping factor of 160 into 8 ohms.

Output 25 watt, continuous rms current 6 amp with a peak current of 20 amps.

Rated output 2x25w into 8 ohms

2x40 watt into 4 ohms

2x11 watt class a output

THD 1watt into 8 ohms 0.002%

 

na fotkach orginal...

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