Thermionic Culture FREEBIRD 3 Channel Tube Equalizer


Thermionic Culture FREEBIRD 3 Channel Tube Equalizer

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The Freebird is a 3 Channel valve Equaliser and comes in Thermionic Culture’s half rack style format and features a built-in but detachable power supply. It is going to function usually as a stand alone unit but if desired The Freebird may be place in a Thermionic Culture 19 inch rack case along with another unit to offer 6 channels of EQ, or you can add a different Thermionic Culture half rack unit like The Nightingale.

The Freebird EQ circuit has a broad and musical nature. It adds a warmth and organic sounding character on it is personal and can be utilized in conjunction using the output from a DAW to supply the character and normal really feel that a plugin EQ will struggle to ever really match.

Getting three channels means that this unit does not must be consigned to a stereo bus alone, or it can be believed of as a multichannel type EQ including that discovered on a classic mixing console.

The indented and switched controls give the user a high degree of recall-ability that is really useful when moving in between mix projects.

The EQ section of the Freebird is based about many models.

The Baxandall ‘Bass’ and ‘Top’ controls give the user two shelving EQs that may move constantly among cut or increase.

We have given two frequencies (15/9 KHz and 100/50Hz switched) at which the ‘Top’ and ‘Bass’ controls operate.

Just these controls alone give a really broad but effective and interactive variety of EQ.

The ‘Presence’ manage provides the user 5 special lifting EQ curves based about the midrange frequencies. This curve was very first created by Vic Keary in 1960 to emulate the difference in frequency response when playing back a tape machine track with an NAB curve when recorded using a CCIR curve.

Switched positions ‘L’, ‘M’ and ‘H’ take the curve centre from about 700Hz to about 3KHz with a improve of about 3dB. Positions ‘H+’ and ‘H++’ take the lift from the ‘H’ curve up by 5dB and 8dB respectively.

The ‘Midcut’ is a 31 position indented pot that offers the user a narrow cut in frequencies at 700Hz constantly variable from 0 to 20dB. This EQ curve is taken from the Rooster ‘mid cut’ control because it proved to become so popular with users.

The ‘HPF’ control gives 12dB/octave higher pass filters operating at 25Hz and 65Hz. The 25Hz position will efficiently remove undesirable sub bass frequencies as well as enable the user to go further with all the volume of bass boost that they choose to use.

The Get manage is an indented constantly variable handle and it can either help the user to match the EQ’d signal’s apparent volume for the un-EQ’d volume. Or it may permit the user to experiment with all the variation in sound with operating level.

The Input is transformer balanced so that any input may be applied towards the Freebird with out any loss of level. The output is unbalanced to preserve the great “open” top quality for which this kind of circuit is renowned. The Bypass switch removes each of the electronics enabling a comparison to be created between the original as well as the eq’d signal, with the aid of the obtain handle.


  • 3 Channel valve eq. with a broad and musical nature adding warmth and naturality.
  • Made in half rack format enabling use with a 2nd Freebird or a Nightingale.
  • Built-in but detachable power supply.
  • Baxandall ‘Bass’ and ‘top’ controls.
  • ‘Presence’ control giving the user 5 unique lifting EQ curves.
  • Indented and switched controls enabling recall.
  • Gain control ranging from -12dB to +5dB.
  • ‘HPF’ control gives 12dB/octave high pass filters operating at 25Hz and 65Hz.
  • Can be used in conjunction with the output from a DAW without loss.
  • Great Stereo buss eq. with a ‘free’ extra channel.
Additional information

Additional information

Weight 33 lbs


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