Hi all,
Have owned an Ibasso DX260 (v1) for maybe a couple of years now. Recently decided to dry adding in the PB6 Macaw tube amp into the equation after reading some online reviews spruiking it.
Only arrived a few days ago from Aliexpress, and on first few listens, I'm noticing a faint high-pitched whine/hum coming from the right channel of my connected IEMs.
Potentially relevant setup info as follows, if it helps anyone to possibly diagnose;
DAP: Ibasso DX260
IEMs: Thieaudio Monarch mk2
Interconnect cable: stock Balanced cable included with PB6
IEM cable: Dunu Lyre Mini (Balanced)
DAP volume: ~90%
PB6 Volume: An appropriate listening level?
Other PB6 settings: GAIN: Low, BANDWIDTH: High, MODE: Tube
Initial diagnostic findings:
1) The whine only appears to come from the right earpiece of my IEMs.
2) The whine increases in volume when the volume of the PB6 is increased.
3) The whine is much louder when Gain is set to High, but still noticeable at higher volumes when gain is set to Low.
4) Switching modes from TUBE to AB causes the whine to completely stop.
Having never owned a tube amp like this before, I'm just not sure whether this is a normal/expected thing, and I'm just being overly nitpicky, or whether there's a chance one of the tubes is failing/faulty on arrival, and thus whether I should be seeking a warranty replacement through Ibasso or the AE seller.
Any help or advice is greatly appreciated! Thanks so much for your time.