![]() ![]() There are modern features available on the MPX, starting with a switchable 80Hz high pass filter switch that I found effective but not too noticeable in action. Also like the original units, there are three tubes: two 12AX7s and a single 12AU7. The microphone input and output transformers are custom-wound to the original specifications by CineMag. The 2U front panel looks like stainless steel and also, like the original 5U 351 unit, uses the same silkscreened font and overall graphic design. I received a Warm Audio WA-MPX single channel pre-amp (the WA-2MPX is two WA-MPX’s in one 2U cabinet) for review and immediately, I found over 90dB of gain available in high-gain mode. Unbeknownst to me at the time was that they also had a built-in microphone pre-amp! There were not a lot of great choices in those days (just after WWII and the Korean War) and you could say the sound of those classic hit records was due in part to those tape recorders.Īs a personal aside, when I first started in a small recording studio outside of Los Angeles, it was an old mono Ampex 351 machine that I first learned recording engineering and tape editing. and were used on many (if not most all) nascent popular music recordings at the time. Models 350 and 351 were popular in the 1950s in the U.S. Warm Audio’s WA-MPX single-channel and WA-2MPX dual-channel tube microphone pre-amps owe their circuit design to Ampex Corporation’s 350/351 tape recorder channel electronics. ![]()
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