Loading... Please wait...
  • Image 1
  • Image 2

Product Videos

Thermionic Culture Phoenix SB Audio Demonstration (03:46)
Charlie of Thermionic Culture introduces the Phoenix SB, an all valve stereo compressor. The Phoenix SB is a smooth 'soft knee' compressor with independent controls for both channels, a side chain filter and a stand by switch to preserve vavle life. Handmade in England. For more information visit: http://www.thermionicculture.com/index.php?option=com_virtuemart&view=productdetails&virtuemart_product_id=20&virtuemart_category_id=1&Itemid=54 Thermionic Culture. Simply the finest outboard equipment powered by thermionic valves. Video by Moon Food Media http://www.moonfoodmedia.com/
  • Thermionic Cul...
    Charlie of Thermionic Culture introduces the Phoenix SB, an al...
write a review

Product Reviews

This product hasn't received any reviews yet. Be the first to review this product!


Max. o/p level (MOL): +19dB into 600Ω; +24dB into 10kΩ
Max gain: 30dB
THD (at no compression): better than 0.06 % @ 100Hz & 1kHz
Noise, IEC weighted: better than 100dB below MOL
Input impedance: 15kΩ
Frequency response: <1dB variation over range of 12Hz to 56kHz
Attack time: 0.004s to 0.12s
Release time: 0.04s to 2.4s
Output impedance: 600Ω

Valve complement (2 ea)
Input/Compression: PCC85 (equiv. 9AQ8)
Output: ECC81 (equiv. 12AT7, CV4024)
Side chain detector: EB91 (equiv. 6AL5, CV4025)

Find Similar Products by Category

Vendors Other Products

Thermionic Culture Phoenix Stereo Compressor

Your Price:
$4,199.00 (You save $1,100.00)
Phoenix Stereo
10.00 LBS
Usually ships within 24 hours
Calculated at checkout

Product Description

The Phoenix SB is now the standard production version of the Phoenix compressor. Alongside the now classic circuit design of the original Phoenix, it incorporates the side chain filter controls from the previous standard Phoenix SC model with the new addition of an HT standby switch.

The additional HT Standby switch allows the user to put the Phoenix into a low power standby mode that is designed to increase the life of the unit's valves and capacitors. When first switching on, or if the unit's not in use for a while, have the Standby on. Switch off Standby and it will instantly come back to full life.

We have also placed the meter zero controls on the front panel for much easier access. Both meters should read "0" when the Phoenix is off standby and not compressing. They can be adjusted easily by any user without harm to the unit.

The side chain filters can be used to cut the Phoenix's compression response to bass frequencies. The filter operates below either 150Hz or 300Hz on each channel and when stereo link is engaged the filters operate at the average of the two sides. This enables the user to choose from 5 filter frequencies when in stereo operation.

The Phoenix is well known for its smooth "soft knee" compression characteristic and excellent specifications. This means that it can be used as a compressor that will not harm your signal quality, whilst subtly controlling dynamic range. It is also possible to drive the unit harder to produce harmonic distortion and higher ratio compression if desired. Many users have found these features bring life to mixes or individual instruments, and control vocals, with a natural "warm" quality.

Contrary to the above, users have found that if the unit is operated in standby mode (it still passes audio) a "symmetrical" distortion occurs, not unlike that produced by overloading analogue tape. Perhaps this fact alongside an exaggerated compression curve lends to the Phoenix in standby mode another dimension.


  • 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