Apt Holman Pre-Amp Mystery - diyAudio
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Old 29th July 2008, 12:56 AM   #1
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Join Date: Jul 2008
Default Apt Holman Pre-Amp Mystery

Has anyone successfully upgraded the TL072 op-amps in the Apt Holman Pre-Amp with something new and improved? About ten years ago I tried using AD712 and OPA275.......both had negative effects on the circuit; there were load pops when any signal switch was deployed. I called Tom Holman, and though he had no advice to give regarding a better op-amp, he did mention that the way he used the TL072 in the pre-amp made substitutions problematic.

So....has anyone found a better device that works?

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