Hi I have an EAR859 Integrated Amp which I would like to modify slightly so it can be used in a bi-amp setup.
The EAR 859 has a set of RCAs for Tape-Out which are feed from the input via a 1K resistor before the volume control pot. Please see attached the schematic.
I would like to modify it so the Tape-Out outputs are taken after the volume control, hence can use for the bi-amp input and be volume adjusted.
I’m planning to feed a Sonance DSP2-750 Amplifier which has 20K Ohm input impedance.
I obviously don’t want to impact the sonic performance of the EAR859.
I would LOVE some help in knowing if this is easily achievable without changing it significantly (that is – with maintaining the pot volume control. I accept its not the best solution, and longer term Id consider changing it to TVC, but for now I'm looking for low cost mod).
Could it be as easy to moving the 1K to the other side of the pot, either before or after the input capacitor? I assume it won’t quite be this easy, but I’m not sure.
Many thanks and apologies for a basic question!
The EAR 859 has a set of RCAs for Tape-Out which are feed from the input via a 1K resistor before the volume control pot. Please see attached the schematic.
I would like to modify it so the Tape-Out outputs are taken after the volume control, hence can use for the bi-amp input and be volume adjusted.
I’m planning to feed a Sonance DSP2-750 Amplifier which has 20K Ohm input impedance.
I obviously don’t want to impact the sonic performance of the EAR859.
I would LOVE some help in knowing if this is easily achievable without changing it significantly (that is – with maintaining the pot volume control. I accept its not the best solution, and longer term Id consider changing it to TVC, but for now I'm looking for low cost mod).
Could it be as easy to moving the 1K to the other side of the pot, either before or after the input capacitor? I assume it won’t quite be this easy, but I’m not sure.
Many thanks and apologies for a basic question!
Attachments
By all means, try what has been discussed. It just might work. The 1 K resistor might have to go.
I'm a belt and suspenders guy. So, I buffer the volume control. Cascoded pairs of DN2540N3 MOSFETs plus a few passive parts should get the buffering job done, without having to "butcher" the chassis.
I'm a belt and suspenders guy. So, I buffer the volume control. Cascoded pairs of DN2540N3 MOSFETs plus a few passive parts should get the buffering job done, without having to "butcher" the chassis.
Hi Chris, Eli - Many thanks for your replies.
I think Ill just try moving the resistor in the very first instance, and if any issues then try buffering. Thanks for the suggestion Eli.
As I say I realise the pot is not the best solution, and Ill consider changing in the future if I keep this amp.
Thanks again!
I think Ill just try moving the resistor in the very first instance, and if any issues then try buffering. Thanks for the suggestion Eli.
As I say I realise the pot is not the best solution, and Ill consider changing in the future if I keep this amp.
Thanks again!
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