Doug, regarding the LME49990 opamps - please make sure that you have the chips properly oriented with single opamps in the U6 and U7 sockets and dual opamps in the U1 and U2 sockets... afaik, neither Morningstar nor EE has issued a warning regarding use of the LME49990 in the EE DAC Plus.
Important Re Opamp Rolling Plus Version of EE DAC
Regarding Opamp rolling the EE Minimax DAC Plus; NOTE: I have been in contact with Morningstar Audio about the opamps used for the Plus version; It is not acceptable to simply use any of the opamps which worked for the original version. Though the circuit board is laid out similarly the opamps are different enough that not all sets of opamps used for the original version will work with the Plus version.
I had mentioned the LME49990 but upon investigation it is not suitable for the Plus version of the Minimax DAC and you could harm the DAC. You opamp roll at your own risk and could damage the unit if you use inappropriate opamps. I am seeking a listing of appropriate Opamps for the Plus version and will post it when it is available.
Opamp rolling is effective and easy, but please wait until a listing of appropriate opamps becomes available.
I had mentioned the LME49990 but upon investigation it is not suitable for the Plus version of the Minimax DAC and you could harm the DAC. You opamp roll at your own risk and could damage the unit if you use inappropriate opamps. I am seeking a listing of appropriate Opamps for the Plus version and will post it when it is available.
Opamp rolling is effective and easy, but please wait until a listing of appropriate opamps becomes available.