I've not managed to find a consensus on this, perhaps someone can chime in: is it more relevant (as in: will the amp damage my headphones longterm) to measure the dc offset with or without a headphone load connected?
Example: my OTL tube amp measures around a meandering few +/- mV unloaded, sometimes hitting 10-30mV and, with my DMM set to record min/max/avg over ten minutes or so, a peak of -300mV, although this was definitely a spike, it didn't slowly climb to, or fall from this value.
With a 600ohm headphone load connected, it's typically <1mV, peak of 5mV, per channel.
All measurements taken after the amp has warmed up for over a minute or two.
Which is the figure to be more confident with??
Example: my OTL tube amp measures around a meandering few +/- mV unloaded, sometimes hitting 10-30mV and, with my DMM set to record min/max/avg over ten minutes or so, a peak of -300mV, although this was definitely a spike, it didn't slowly climb to, or fall from this value.
With a 600ohm headphone load connected, it's typically <1mV, peak of 5mV, per channel.
All measurements taken after the amp has warmed up for over a minute or two.
Which is the figure to be more confident with??
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