Many times it is the transformer ,at the 50-60 hz region mechanicalhum
the better transformers donot do this much since they are double potted in
Opoxy for vibration .Torroidal transformers. Are by far the worst offenders.
Piltron , Triad make very good models myself have paid extra to get the Black
double potted Piltron transformer if this amplifier you are Very happy with .the
transformer itself is under $100. Speak with peach tree. I doubt they used a top
transformer .personally I see this happen all to often for an extra $30-40 dollars
when being built would avoid a lot of this problem ,another issue is their grounding scheme .if all used 3 point star grounding this extra step would eliminate a lot of headaches. It is very frustrating I went through 3 amps one time 3 different brands just to get a good one . Pass Labs never an issue,
spread Spectrum ,Son of Ampzilla fantastic dead quiet , just an example of 2 of my current amps .
the better transformers donot do this much since they are double potted in
Opoxy for vibration .Torroidal transformers. Are by far the worst offenders.
Piltron , Triad make very good models myself have paid extra to get the Black
double potted Piltron transformer if this amplifier you are Very happy with .the
transformer itself is under $100. Speak with peach tree. I doubt they used a top
transformer .personally I see this happen all to often for an extra $30-40 dollars
when being built would avoid a lot of this problem ,another issue is their grounding scheme .if all used 3 point star grounding this extra step would eliminate a lot of headaches. It is very frustrating I went through 3 amps one time 3 different brands just to get a good one . Pass Labs never an issue,
spread Spectrum ,Son of Ampzilla fantastic dead quiet , just an example of 2 of my current amps .