| Thanks for the info reprenize, but that PDF is for the Art Tube MP, not the MPA gold.
The Tube MP is an OP Amp based Mic pre with a starved plate tube gain stage.
The MPA gold is similar but the Tube gain stage isnt starved plate. It does actually put out around 180v to the tube so anyone playing with this device, please be careful.
As for the Op Amp replacments, Digikey was out of the LTs. Depending on how the Op Amps I was able to get a hold of, I may end up leaving this chip out.
I did take a meter to the Op Amp voltage pins and they were sitting right around 15v. So please do not try using the AD8606. The AD8066 may be promising but Id have to get a SOIC to SIP converter.
There is a lot of good information in there though. |