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Hi, new PPP owner here.
I am curious that I get quite a bit of variance as shown by the display. Not sure what is normal and within tolerances.
My power seems to change as it gets later at night, nothing unusual there, but output of the PPP seems to change as well. Daytime, I read input 118-119 and boost to 122. As it gets later at night, input voltage goes up to 120 and output goes down to 120.
Here's where it is more curious. Daytime THD input is ~2.2-2.4% and output is ~0.4%. Later at night, when voltage drops, input THD reads roughly the same but output THD rises to ~1.5%. What would cause that and what is too high?
How accurate are these front panel readings?
That's really strange. The metering system is not perfect by any means and you will see some variance normally. Usually one volt or so and this is due to temperature. However, the THD bit has me stumped as I am sure the load remains the same? The fact that the input THD is the same and the output is varying like that doesn't sound right. Are you sure nothing in the system is changing at night? You're not adding any equipment?
I have a tube pre, cd player and 70 watt stereo tube amp plugged into the PPP. Prior I had a P-300 running the amp and a P-300 running the front end with no problems so I thought a PPP should work.
Came home tonight and checked readings before turning anything on. It read ~118-119 input adding 3 volts to output 122. THD input ~2.5%, output ~0.4%. Turned everything on to warmup and nothing changed. Came back about 20 minutes later, unmuted the preamp and turned volume up to listening level (with nothing playing) and saw the THD output jump to ~1.2%. Turning the amp off reduces it back to .4 THD. Turning amp back on it immediately jumps back to low to mid 1%.
Is 1.2-1.5% too high and is that abnormal?
BTW, the output voltage variance seems to affect the bias of my tube amp so I assume it is real.
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