In a recent thread on akarma, it appears that one can do a minor upgrade to the PhD, by changing out 2 Op Amps on the output section of the motherboard.
Changing from OPA134PA, to OPA627AP at positions U7 and U10 on the motherboard. They are simple 8 pin plug an play, no soldering involved.
This upgrade has Ron Sutherland's blessings, and he said it's a worthy upgrade. The original factory installed op amp chip is about $3 each, the better OPA627AP replacement about $22 each at Digikey.
I;m going to be doing this upgrade myself soon. Mark
Changing from OPA134PA, to OPA627AP at positions U7 and U10 on the motherboard. They are simple 8 pin plug an play, no soldering involved.
This upgrade has Ron Sutherland's blessings, and he said it's a worthy upgrade. The original factory installed op amp chip is about $3 each, the better OPA627AP replacement about $22 each at Digikey.
I;m going to be doing this upgrade myself soon. Mark