Hi Guys,
I have a brand new Zero 09 with USB with approx 40 to 50 hours use.
been trawling through this post, lots of excellent stuff. But can someone please help me select a reseller for a set of LT1364 & a set of LME49720's? Lots for sale on ebay, but my problems are
1. Picking ones that are genuine
2. picking the right options! Most have 3 different lots of suffixes to choose from and I am a bit clueless.
Sorry if the answers are on here somewhere, buy over 600 pages are a lot to get through.
I have been very impressed with the sound straight from the box, and I'm running it through a pretty decent rig - perreuax power amp, Polk RTA-15TL's... I mainly use the DAC section through my amp/power amp combo, but with a wee child on the way I might find a bit more use for the headphone section.
The main reason for changing the headphone OP-Amp is that out of the box the output was clean through my AKG K240's (not the best HP I know - ex my DJ rig), now I am hearing a definite hiss and distortion on the higher frequencies and it is very distracting. This hiss is only present when the input source is being played. With no music the HP/Preamp out is clean even when increasing the volume. I have tried with both USB and coax input from different sources - laptop, PC, CD etc and the hiss does not change. I have also tried with different headphones - same hiss.
The direct analog output is fine - no hiss. If the headphone or preamp output is used there is hiss.
As this sound wasn't present to begin with I am seeing about return, or if the supplier will provide a replacement Headphone amp PCB. If I cannot get a good return option that doesn't cost the earth I was thinking swapping out the headphone OP_amps might help, hence the question on what style.
Any idea if this might work? Anything else I can check? There is nothing looking burnt or odd on the PCB and I can find not loose bits of solder viewing from above. Remember I am trying to keep this pristine in case of return, if return isn't an option I have no problems ripping into it!
many thanks
Rob.