Robot Ring Modulator ! - Early 2000’s Burford Electronics

For your consideration is a Burford Electronics “Robot” ring modulator built by Alan Exley in the very early 2000’s !  A very unique pedal that rarely comes up for sale. 

Alan was early boutique effects builder & luthier in the UK. The Robot is an intense ring modulator that has a classic sound.
A bit more from Alan’s original website : 

“Boutique effects pedal from Burford Electronics
Hand built in the heart of England.

Feed your guitar through this device and you will get the guitar sounds mixed with the sum and the difference between the guitar and the oscillator frequencies, producing 'metallic' overtones to your guitar and various strange techno sounds, depending on where the oscillator pitch is set.

What was it used on? If you listen to the guitar solo on the track Paranoid, by Black Sabbath, you will hear pure distortion guitar on one side and ring modulation on the other. In the stereo image this sounds quite weird. I'm quite sure it's been used on many things. Another classic example is on the Doctor Who theme.
This device is great for playing riffs, creating loops, and other weird phrases. The features of this pedal are:

It has two controls, modulation and oscillator. The modulation control adjusts the mix of the dry signal to be effected. The oscillator controls the pitch of the oscillator tone.
It has two switches: one is accent, the other one is range. The accent adds another feature to the oscillation, which gives a slightly different character to the sound. The range switch has three ranges. 1 is the upper band (easier to tune to high frequencies). 2 is upper and lower band. 3 is the sub band. This gives low-fi, tremolo type sounds, (which can be quite "nasty"). Also there tends to be a "click", almost like interference from the oscillator - with the accent on you can get some bizarre type sounds by playing with or against the beats that are going on: all you need is root and octave. It also sounds very different if you play against the bridge.
It has two jack sockets: one in and one out and it has true bypass.

Setting suggestions to get you going..... 
With modulation fully anti-clockwise, range on 1, oscillator fully clockwise, tune into higher pitch range and play riffs, chords or lead and adjust modulation to suit. Switch on the accent setting and then generally mess around.....
Try tuning the oscillator to the key you are playing a riff in, adjust modulation accordingly then try going down an octave on the oscillator and see what happens......
Go to 3 on the range switch, about half-way on the oscillator, turn modulation up full, hit an open A and get familiar with the beat then put the accent on and play either with or against the beat with root and octave....
Have FUN!! “

Offers welcome !