via this auction
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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