Spectrum Shifter Surrey Electronics Phazing Unit RARE Studio Gear Frequency FX

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via this eBay listing

It appears to have an original red Surrey Electronics case, compared to this racked one. You'll find a spec sheet there as well.

"Surrey Electronics Spectrum Shifter

Uses the same principle as Bode frequency shifter. Ostensibly for 'Howl Reduction' but capable of some very interesting effects. Essentially, unlike a pitch shifter, a frequency shifter does not preserve the harmonic relationships in the input signal. In practice this means the output quickly starts to deviate from what is going in and extra tones are added which then interact and interfere with the source producing new harmonics and drones. Very good with other fx. Great studio addition as you can plug allsorts in not just for vocals.

31cm x 27cm x 24cm
240v unit

Mono input and output via 1/4" jacks on the rear. (standard 'guitar' Jacks)
some scuffs and slider plastic is missing, did not replace as does not affect use. See photos."

This one was spotted and sent in via
M Me.

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Surrey Spectrum Frequency Shifter

Note: links to listings are affiliate links for which the site may be compensated.

via eBay

This is the first Surrey post. Via the listing:

"This is something special and quite unique.. The Spectrum Shifter by Surrey Electronics. Rare audio processing device from the 70-ties, not the same principle as a pitch shifter. A bit like a budget Bode shifter. The slider might need some cleaning but everything works and it is ready to play or mod into...

Please have a look at the pictures and see for yourself. Let me know if you have any questions. Please check my 100% positive, music/synth/studio related feedback. I'm a serious and professional seller AND packer.

Something about frequency shifters from the web:


'a frequency shifter will shift all frequencies additively. Thus, the spectra (overtone content) of the source will become increasingly distorted with shifting. This is opposed to say, a Harmonizer's pitch shifting. Frequency Shifters usually use a quadrature oscillator as the carrier (these were usually voltage-controlled in analog synth oriented models), and at low rates, can be used to reduce microphone feedback. The famous devices designed by Harold Bode can shift up to 5k and good carrier rejection, and were used in electronic music studios to radically alter sounds, especially sources with a lot of noise, such as percussion. FS's were featured in several analog synths, such as the Buchla, Serge (two versions, one with external carrier), and the Moog (licensed from Bode).'"

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