Altec 1689A two-channel mic preamp #1


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Rackmount mic preamp from Altec. The 1689A has two inputs with direct outputs and a transformer-coupled mixed output with EQ controls

The unit is more complex & capable than it looks at first. Internal switches set gain, phantom power & high-pass filters per channel and each mic channel has a post-mix volume control unbalanced direct output . There’s a low-pass filter and eq defeat switch for the main output and the two Links jacks allow connection of additional mixer / preamplifiers

Clearly designed to be configured & then racked for use, the 1689A needs a bit of thought before use but has lots of useful options

The 1689A front panel has:

  • Front-panel gain control for mixed output
  • Main output mix controls for Ch 1 & 2
  • Main output low & high-frequency shelving EQ controls

Internally, the 1689A has:

  • Transformers for Ch 1 & 2
  • Mic / line switches for Ch 1 & 2
  • Gain select switches for Ch 1 & 2
  • 250 Hz high-pass switches for Ch 1 & 2
  • Phantom power switches for Ch 1 & 2
  • Low-pass 5 kHz filter switch for main output
  • EQ bypass switch for main output

These Altec units are built super-tough in a steel chassis. Main inputs & output are transformer-balanced on XLRs with unbalanced direct outputs & links on jack sockets

Tested & working 100%. Photos show one of the units for sale

The service / setup manual is available under the Links tab

Rackmount mic preamp with two inputs, direct outputs and a mixed output with tone controls. 15 Volt phantom power switchable internally. Short 50cm power cable
Standard rackmount device
Service / setup manual
In excellent used condition. Tested & working 100%. Photos show one of the units for sale