• These commercial threads are for private transactions. diyAudio.com provides these forums for the convenience of our members, but makes no warranty nor assumes any responsibility. We do not vet any members, use of this facility is at your own risk. Customers can post any issues in those threads as long as it is done in a civil manner. All diyAudio rules about conduct apply and will be enforced.

Pair of fully populated USSA 5 25w Class A board

stretchneck

Member
Paid Member
2018-03-17 6:45 pm
Oxford
Assembled by Fab, the designer.

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

attachment.php


£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
 

Attachments

  • USSA.jpg
    USSA.jpg
    986.1 KB · Views: 1,303

stretchneck

Member
Paid Member
2018-03-17 6:45 pm
Oxford
Can also throw in some panel mount RCA inputs for free, and I also have some brand new Jensen input transformers as well that I would sell alongside at a good price. A good way to have XLR input to a single ended amplifier.
 

Attachments

  • 151A63F8-E5EE-412B-A815-FE2B5F5C111F.jpeg
    151A63F8-E5EE-412B-A815-FE2B5F5C111F.jpeg
    288 KB · Views: 19
  • 14558248-1516-4C7D-8060-4413D4E84BB5.jpeg
    14558248-1516-4C7D-8060-4413D4E84BB5.jpeg
    237.4 KB · Views: 17