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The Thermionic Culture Phoenix is a stereo valve compressor that utilizes the same side chain filter controls found in their previous Phoenix SC compressor, albeit with the inclusion of an HT switch. This latest addition allows the Phoenix to operate in a low power standby mode that extends the life of its valves and capacitors. Keep this control on when initially turning the unit on, especially if it has not been used for some time.


Additional upgrades include the addition of meter zero controls to the front panel. Make sure they display a value of 0 when the unit is not in standby mode or compressing anything. Concurrently, the unit’s sidechain filters cut its overall compression response to bass frequencies. It lends its magic to frequencies below 150Hz or 300Hz per channel; also, they operate as the average of the two sides whenever the stereo link parameter is switched on. Essentially, this means that stereo mode features five possible filter frequencies that one could choose from.

The Features

All valve signal path and side chain, point to point hand wired in England

Subtle control with "soft knee" compression, but more compression effects when pushed hard

Continuously variable attack, release and threshold controls

Stereo link for mix buss compression

Side chain filters to enable compression of all frequencies except bass

Flat frequency response over full audio range and beyond

Very low phase shift and harmonic distortion (unless pushed hard)

Push-pull design gives a natural warm sound with high output level

Output trim controls for fine adjustment or lower level operation

Balanced ins and outs with custom made Sowter transformers

Bypass switch on each channel removes all electronics

Standby switch to prolong valve life

Distortion effects can be created with Standby on

Thermionic Culture Phoenix Stereo Valve Compressor

  • Thermionic Culture Phoenix Stereo Valve Compressor
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