Among the find was the MTA401 transistor array, the 1537 and 1537A data sheets and the "IMP" Instrumentation Microphone Preamplifier hybrid.
VCA Associates MTA401 data sheet: https://proaudiodesignforum.com/images/ ... MTA401.pdfThe IMP achieves sonic performance previously found only in vacuum tube and discrete microphone preamplifiers.
The IMP uses VCA associates' MTA401 supermatched, low noise transistor array and the latest surface mount hybrid technology to allow the OEM to fabricate a truly superb, cost-effective transformerless mic preamplifier in a minimum of space, with a minimum of external parts.
VCA Associates IMP Mic Preamp data sheet: https://proaudiodesignforum.com/images/ ... Hybrid.pdf
VCA Associates IMP Mic Preamp Applications: https://proaudiodesignforum.com/images/ ... ations.pdf
VCA Associates/Aphex 1537 data sheet: https://proaudiodesignforum.com/images/ ... _VCA_2.pdf
Tags: Harvey Rubens, David Baskind, VCA Associates, Aphex, VCA, Voltage Controlled Amplifier, 1537, 1537A, IMP Instrumentation Microphone Preamplifier, Active Preamp, Mic Preamp History, MTA 410, MTA-401, MTA401, Transistor Array, David Blackmer, dbx, Solid State Music, SSM.