Included with edit suite hire, if needed. For those jobs that need extra mixing channels than provided by just the eight-channel Yamaha mixer wired into the edit suite, 24dB of headroom, or a vintage 1970s sound. Not available for off-site use (needs a lot of TLC, and very awkward transportation requirements would be entailed).
Mains powered (well, you could power it alternatively, if you had a very meaty 50 Volt DC supply), barely portable (it's designed for a fixed installation, is big, heavy, and the chassis is not very rigid), all discrete transistor circuitry, vintage audio mixer.
In this case, “Astor” was the Australian “Radio Corporation Pty Ltd” in South Melbourne. This mixer is ex-ABC radio equipment, from Adelaide (Studio 511, going by hand-written servicing comments on some of the parts).
Input channels with:
Reverb return inputs with:
Master output channels with:
|2||Independent master faders for the two reverb send channels|
|1||Bantam/TT TRS connector patch panel for all input and master channel sources, inputs, outputs, inserts, monitor inputs, master outputs, tone generator output, and spare rear-panel sockets|
|1||Monitor switcher for the main VU meters, studio-floor and control-booth monitor bus outputs (selects from main, reverb and uncalibrated-PFL output buses, plus five tape monitor inputs)|
Meter bridge with:
|2||+8dBm floating transformer balanced main (left and right) outputs (with parallel-wired XLR and 6.35 mm TRS connectors)|
|2||+8dBm floating transformer balanced reverb send outputs (6.35 mm TRS connectors)|
|2||+8dBm balanced studio-floor monitor send outputs (6.35 mm TRS connectors), with independent level controls, and auto-muting when an input-channel microphone is alive|
|2||Balanced control-both monitor send outputs (6.35 mm TRS connectors), with a combined level control, and auto-muting when the built-in control-booth intercom microphone is alive|
|1||Unbalanced, adjustable-level, headphone monitor socket for the monitor bus (6.35 mm stereo TRS connector, on the rear panel)|
|1||Front panel microphone for slate recording, and intercom to the two studio monitor busses and an independent third talkback output (+8dBm balanced 6.35 mm TRS connector).|
|2||Dual-redundancy 50 Volt DC linear power supplies|
If anybody can tell me what the NOL, ROL, & POL abbreviations stand for on the switches that pad the main VU meters, I'd like to know. The Astor mixer (type 4170-411-01) manual says nothing about it, and I could only guess at their meanings. (Normal, reserve, & peak output levels, perhaps?) I do know what they do technically, though: 0VU at the NOL position is +8dBm (normal metering), at ROL position it's +16dBm (8dB attenuation), and at POL it's +20dBm (12dB attenuation).