Hello, I received the two 2SJ109 and indeed the problem came from there. If someone can sell me 2 more, I would prefer to have some in stock.
My technician would also like to have confirmation of the value in millivolts that must be set for the bias on this version 0 (of the XA-60). After replacing the 2SJ109, the adjustment to 175 mV became possible as well as the offset, on the other hand the adjustment is done almost at the minimum of the adjustable and the amps are just lukewarm.
Does this seem normal to you ?
My technician would also like to have confirmation of the value in millivolts that must be set for the bias on this version 0 (of the XA-60). After replacing the 2SJ109, the adjustment to 175 mV became possible as well as the offset, on the other hand the adjustment is done almost at the minimum of the adjustable and the amps are just lukewarm.
Does this seem normal to you ?
thanks but that doesn't tell me if 175mv is the right setting, it seems so but we are not sure, despite two emails to pass labs customer service, no response
Take the temperature inside your home of what it would be during the summer and subtract it from 50° c. That is your desired temperature rise. 25 to 30° C is typical. Now you just increase the bias until you get to that much temperature rise. These amps are pretty tough. If for some reason it hits 55°, it's not the end of the world. You could also set it to say 45° and be on the safe side.
Pass says himself to adjust the bias based off a temperature. I would assume it's the same for the first series of the XA amplifiers
Pass says himself to adjust the bias based off a temperature. I would assume it's the same for the first series of the XA amplifiers
Are you telling me that it needs to be a certain temperature, for example 45° for it to work best?
"best" is not exactly proper term, because it implies criteria, and criteria must be defined tightly, so everything clear in dialog
anyhow, it's simple as this - if you set Iq to some value and heatsinks are just warm, then just elevate Iq to higher value, observing resulting temperature........ and don't go above specific heatsink temperature
more Iq, everything better
"best", well - whole another can of worms
anyhow, it's simple as this - if you set Iq to some value and heatsinks are just warm, then just elevate Iq to higher value, observing resulting temperature........ and don't go above specific heatsink temperature
more Iq, everything better
"best", well - whole another can of worms
Thanks, I understand, the highest possible value as long as it remains within acceptable temperatures
set to 280, it seems a bit too much to me, not easy to know, the body is warm but the fins are burning hot
palm on top of heatsink, so across thick base and fins
or use contact thermometer, top, touching thick base in between the fins