Hi All,
My Zanden DAC has a separate power supply which uses: (2) 6CA4 and (1) 6X4
i got great recommendations from Brent Jessee: Mullard 1950s 6CA4 and Sylvania 6x4
The problem is after 1200 hours or so, the mechanical hum from the power supply is big and comes thru the speakers. i just switched to a backup set of the identical tubes...and the noise is slightly greater! At the volume set at 35 (of 99) and 55 being very, very loud...i can hear the hum throughout my room and within 10 feet...irritating.
Is it these NOS 1950s tubes? Do tube dampers help? Or is it DC coming thru the line? If tubes, can you all recommend quieter tubes? thanks for any guidance.
My Zanden DAC has a separate power supply which uses: (2) 6CA4 and (1) 6X4
i got great recommendations from Brent Jessee: Mullard 1950s 6CA4 and Sylvania 6x4
The problem is after 1200 hours or so, the mechanical hum from the power supply is big and comes thru the speakers. i just switched to a backup set of the identical tubes...and the noise is slightly greater! At the volume set at 35 (of 99) and 55 being very, very loud...i can hear the hum throughout my room and within 10 feet...irritating.
Is it these NOS 1950s tubes? Do tube dampers help? Or is it DC coming thru the line? If tubes, can you all recommend quieter tubes? thanks for any guidance.