Proton AA461PRO Mono Power Amplifier + Proton AP400PRO Preamplifier Package (Used)

Description

AA461PRO 2 Unit

AP400PRO 1 Unit

AP400 PRO

• It is often listed in used HiFi markets as a control amplifier / pre + power hybrid / unit (i.e. combining preamplifier control functions with at least some amplification) under the “Proton AP‑400 PRO / AA‑461 PRO Consonance.it” pairing in a listing.

• There is a listing “Proton AP‑400 Pro previo con phono” — “previo” is “preamplifier” in Spanish — indicating the AP‑400 PRO includes a phono stage (or phono input).

• Because it is paired (in one listing) with AA‑461 PRO, the AP‑400 PRO may act as the preamp and control section, while the AA‑461 handles final stage (power amplification) duties.

• Beyond that, I did not find reliable published values (power, distortion, frequency response, etc.) for the AP‑400 PRO

AA461 PRO

• The AA‑461 PRO appears in discussions / schematics archives (HiFi Engine forum) — e.g. a user asking for “Proton AA 461 schematics.”

• Because of the “AA” designation, it is likely a power amplifier / final stage amplifier in the Proton lineup, designed to take the preamp/control signals (from a device like AP‑400 PRO) and drive loudspeakers.

• It is common in vintage Proton gear that the “AA” series are final amplifiers.