Mike H wrote:Yep that's why I always try to use sealed enclosed presets, including multi-turn where most appropriate.
I guess the DC bias could be as much as it will stand heat wise.
About 25 years ago I'd got meself a new Pioneer 100W per channel amp, had a big heatsink in it that was always hot even at low power / idle. From which I deduced the bias was on the high side on purpose for more class A.
Yep as you describe my Nad 352 gets burn hot to and that's still as factory settings unless it can drift perhaps I should check it agenst the manuals and see
It is a bit tempting too wind up the current for that class A sound thou
I have just been checking the idle current of pioneer amp 1 SA- 6200 from cold @ 39.03mV after about two hours it drifts up/down like 33.mV to 38.05 is this the norm I have also found the Schematic of its little 10 Watt brother which states the idle current for it as 30mV but says to use a 8 ohm non- inductive resister on on speaker I have just connected the MM to the pins should i use the resistor
So the Little SA-5600 is @ 30mV/0.5R=60mA the SA6200 is double the power so can we run it say @about 41mV0.5R=82mA what do you think
colin.hepburn wrote:after about two hours it drifts up/down like 33.mV to 38.05 is this the norm
Not having monitored one like that I have no idea! I suppose some 'drift' must be expected. Whether it's warmer or cooler. And what about the difference between Summer and Winter?
"No matter how fast light travels it finds that the darkness has always got there first, and is waiting for it."
colin.hepburn wrote:after about two hours it drifts up/down like 33.mV to 38.05 is this the norm
Not having monitored one like that I have no idea! I suppose some 'drift' must be expected. Whether it's warmer or cooler. And what about the difference between Summer and Winter?
Yep could be the temp I suppose it seems to count up to about 38/39 then down again just did not expect to watch it drop up/down I though it maybe because I haven't got a 8 ohm resistor on the speaker post