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Pair of fully populated USSA 5 25w Class A board
Pair of fully populated USSA 5 25w Class A board
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Old 2nd October 2021, 07:58 AM   #1
stretchneck is offline stretchneck  United Kingdom
diyAudio Member
 
Join Date: Mar 2018
Location: Oxford
Pair of fully populated USSA 5 25w Class A board
Default Pair of fully populated USSA 5 25w Class A board

Assembled by Fab, the designer.

Mosfets 2SJ313/K2013
output Mosfets ALF16P16W/16N16W
Everything is matched.

Pair of fully populated USSA 5 25w Class A board-ussa-jpg

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
Attached Images
File Type: jpg USSA.jpg (986.1 KB, 778 views)
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Old 5th October 2021, 11:08 AM   #2
stretchneck is offline stretchneck  United Kingdom
diyAudio Member
 
Join Date: Mar 2018
Location: Oxford
Pair of fully populated USSA 5 25w Class A board
More photos attached
Attached Images
File Type: jpg IMG_1393.jpg (826.0 KB, 570 views)
File Type: jpg IMG_1394.jpg (846.5 KB, 561 views)
File Type: jpg IMG_1395.jpg (951.2 KB, 549 views)
File Type: jpg IMG_1396.jpg (793.8 KB, 92 views)
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Old 8th October 2021, 10:34 AM   #3
stretchneck is offline stretchneck  United Kingdom
diyAudio Member
 
Join Date: Mar 2018
Location: Oxford
Pair of fully populated USSA 5 25w Class A board
Still available
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Old 14th October 2021, 05:51 AM   #4
stretchneck is offline stretchneck  United Kingdom
diyAudio Member
 
Join Date: Mar 2018
Location: Oxford
Pair of fully populated USSA 5 25w Class A board
Bump still available
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Old 28th October 2021, 03:12 PM   #5
stretchneck is offline stretchneck  United Kingdom
diyAudio Member
 
Join Date: Mar 2018
Location: Oxford
Pair of fully populated USSA 5 25w Class A board
Bump
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Old 25th November 2021, 11:41 AM   #6
stretchneck is offline stretchneck  United Kingdom
diyAudio Member
 
Join Date: Mar 2018
Location: Oxford
Pair of fully populated USSA 5 25w Class A board
Bump - offers anyone?
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