Hi,
First post on here, little to no electronics experience, but desperate times...fingers crossed...
After loving an old Musical Fidelity X-10D tube buffer, I have had a very knowledgeable friend put together one of the cheaply and widely available Musical Fidelity X-10D PCB clones for me.
The specific one being used is described as the PRT-09A and supposedly has an upgraded power supply along with a couple of other supposed 'upgrades' compared with the original board.
Board has all been built-up using mundorf evo caps etc and according to my friend, it all tests fine, but there is an audible hiss coming through the speakers when connected. Pretty loud too.
Guy from China who sold me the board has been helpful to be fair. AC input is set at 30 0 30, so he initially suggested lowering the test point voltage down (initially set at +36V, lowered to 28VDC), but no change.
GND is properly connected to chassis and the hiss is present with the board out of the chassis anyway, so not that either.
All resistors testing correctly.
Has anyone ever used one of these X-10D clone boards before and if so, do you have any ideas as to what the problem might be?
Appreciate the first thing someone will say is it's my own fault for getting a cheap PCB from China and you are probably right, but given the seller has come back, it seems to suggest he has faith in the board. Maybe.
Any suggestions greatly appreciated (chuck it in the bin?).
NB. All technical discussion will have to be relayed back to the guy doing it for me as my electronics knowledge is pretty embarrassing. He's not in for forums, so I said I'd post something.
Many thanks in advance.
P.S. been reading stuff on this site for years and whilst most of the discussion makes no sense to me at all, it is a fabulous resource, so keep up the good work folks!
First post on here, little to no electronics experience, but desperate times...fingers crossed...
After loving an old Musical Fidelity X-10D tube buffer, I have had a very knowledgeable friend put together one of the cheaply and widely available Musical Fidelity X-10D PCB clones for me.
The specific one being used is described as the PRT-09A and supposedly has an upgraded power supply along with a couple of other supposed 'upgrades' compared with the original board.
Board has all been built-up using mundorf evo caps etc and according to my friend, it all tests fine, but there is an audible hiss coming through the speakers when connected. Pretty loud too.
Guy from China who sold me the board has been helpful to be fair. AC input is set at 30 0 30, so he initially suggested lowering the test point voltage down (initially set at +36V, lowered to 28VDC), but no change.
GND is properly connected to chassis and the hiss is present with the board out of the chassis anyway, so not that either.
All resistors testing correctly.
Has anyone ever used one of these X-10D clone boards before and if so, do you have any ideas as to what the problem might be?
Appreciate the first thing someone will say is it's my own fault for getting a cheap PCB from China and you are probably right, but given the seller has come back, it seems to suggest he has faith in the board. Maybe.
Any suggestions greatly appreciated (chuck it in the bin?).
NB. All technical discussion will have to be relayed back to the guy doing it for me as my electronics knowledge is pretty embarrassing. He's not in for forums, so I said I'd post something.
Many thanks in advance.
P.S. been reading stuff on this site for years and whilst most of the discussion makes no sense to me at all, it is a fabulous resource, so keep up the good work folks!
Not sure what you mean by AC input is set 30 0 30...can you explain?
X10D is powered by 12 volt AC, as far as I know.
Problem with X10-d as preamp
X10D is powered by 12 volt AC, as far as I know.
Problem with X10-d as preamp
