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Old 6th October 2012, 06:32 AM   #3191
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What would be the best way to fine adjust the PSU to get 290V for the SSHV2 board please??

Last edited by king4joy; 6th October 2012 at 06:37 AM.
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Old 6th October 2012, 06:41 AM   #3192
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Load your PSU's output (disconnect preamp) with resistor that asks 45mA at 290V and tune until you get about 290V I think. 22K//18K//18K 10W each. Then disconnect them and it will give the same if you connect SSHV2 set at 45mA.
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Old 6th October 2012, 06:45 AM   #3193
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22K//18K//18K 10W each.....parallel with the bleeder resistor to adjust for 290V out??

Last edited by king4joy; 6th October 2012 at 06:50 AM.
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Old 6th October 2012, 06:49 AM   #3194
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No, across output capacitors to the right.
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Old 6th October 2012, 06:53 AM   #3195
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Those will be just dummy load so you will be able to adjust your bleeder, see how much the rectifier sags, see your series drop on the chokes. And to try for 280V-290V.
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Old 6th October 2012, 06:53 AM   #3196
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Or you simulate on PSUDII. http://www.duncanamps.com/psud2/index.html
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Old 6th October 2012, 07:00 AM   #3197
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OK...ok...understand....put a dummy load that will draw about 45mA at 290V....and adjust the value of the bleeder resistor to give 290V at the dummy....
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Old 6th October 2012, 07:18 AM   #3198
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interesting....after moving out the second choke....the bleeder looks like a load resistor....yes??
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Old 6th October 2012, 07:36 AM   #3199
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so I will use a 6.4K 10W as load; and adjust bleeder to give 290V...then remove the 6.4K, and connect the PSU to the SSHV2.....and I use a 11.6K as a dummy at the output of the SSHV2....
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Old 6th October 2012, 07:45 AM   #3200
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10W will melt, 290V*0.045A=13W. That is why I suggested 22K//18K//18K 10W each. You need about 2 times the dissipated power in nominal resistor power to get very hot and 3 times to get rather comfortably hot. Your bleeder is now direct part of the load after the chokes move, yes. The other things you wrote are correct.
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