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|2nd October 2021, 07:58 AM||#1|
Pair of fully populated USSA 5 25w Class A board
Assembled by Fab, the designer.
output Mosfets ALF16P16W/16N16W
Everything is matched.
£300 the pair + P&P. If I can find them I'll also throw in a new pair of 24v SMPS that can be used to testing.
Specifications of USSA-5 (obtained on 1 channel) (updated 2019-11-24)
Gain: 20dB (or x10)
Input sensitivity: 1.8 V-peak for output (20W rms)
Damping Factor (100 Hz , 8 Ohms): [35 – 45]
Output impedance: about 0.2 Ohm
Input Impedance: 22K Ohms
Max power into 8 Ohms before clipping: <25Wrms (at Supply voltage of +/-24Vdc, 1.2A Bias current)
Power in Class A (8 Ohms): depending of bias current
DC offset: trimmable to < 3mV
Rise time (10 to 90%) < 1.3us
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