I have a 9.1 but using the phono input is imposable due to the hum.
I don’t think it is a ground loop as I have:
Disconnected everything but the phono input
Turned off all other power in the house except the power circuit for the Hi Fi
Used an MIT Z-Isolator for the power supply
Ungrounded everything
Grounded the amp then the step up amp then the TT.
Added a ground loop isolator to the TV coax.
Tried shielded ICs
Tried shielded ACs.
I have spent hours trying to get rid of this hum
When I unplug the phono IC from the amp no hum if I connect an IC the hum returns
I tried connecting the other end of the IC to a tape , Video and CD deck all these units were unplugged (I did not send a signal) the same hum.
I have checked for a short in the phono input but it reads fine so I am left with????
I am using a MC cartridge with a step up amp this just makes the hum worse.
It is louder than the music.
As a second point how do I upgrade the 9.1 since I have had it I have never tried to upgrade, is there a web site with new firmware?
I called Integra but they said there are no upgrades available but I read on the web that this can be upgraded to a U2.
Thanks
I don’t think it is a ground loop as I have:
Disconnected everything but the phono input
Turned off all other power in the house except the power circuit for the Hi Fi
Used an MIT Z-Isolator for the power supply
Ungrounded everything
Grounded the amp then the step up amp then the TT.
Added a ground loop isolator to the TV coax.
Tried shielded ICs
Tried shielded ACs.
I have spent hours trying to get rid of this hum
When I unplug the phono IC from the amp no hum if I connect an IC the hum returns
I tried connecting the other end of the IC to a tape , Video and CD deck all these units were unplugged (I did not send a signal) the same hum.
I have checked for a short in the phono input but it reads fine so I am left with????
I am using a MC cartridge with a step up amp this just makes the hum worse.
It is louder than the music.
As a second point how do I upgrade the 9.1 since I have had it I have never tried to upgrade, is there a web site with new firmware?
I called Integra but they said there are no upgrades available but I read on the web that this can be upgraded to a U2.
Thanks
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