Muamp development from the start
Muamp started with an initial aim to design and build an ideal headphone that provides ultimate sound reproduction.
This is a selection of photos shown in chronological order from the start showing the development of the headphones.
New photos are now added to the top of the page. Going down the page goes back in time.
Close up of the headphone audiophile cable.
Muamp sheath cable. This style of cable is preferred by the headphone audiophiles.
Close up of the new Muamp plaited cable.
This is an improved variation of the Muamp plaited cable. Thinner wire with greater insulation. Very light and flexible.
The original cable used on Muamp#1. It has separate conductors held with cable clips. Very low cable capacitance.
Muamp Perspex plug.
Hardwood end Muamp plug.
A range of Chinese bought-in ear cushions were tested to see if they would be suitable for Muamp ESHS. Large ear cushions made from synthetic materials to lambs leather were tested, but none could compete wth the comfort and breathablity of the Muamp fleece ear cushions. When listening to headphones for long periods, they must be comfortable and not make the ears sweat with build-up of condensation.
Muamp#4 photographed for a sales promotion.
Close up of the surrounds with ultra thin headband cross frame, just before inserting the electrostatic panels.
The customer of Muamp#5 requested an ultra thin cross frame to make the back as open as possible. Pleased to say he liked the result. The cross frame still allows the Muamp style headband, providing protection to the panel, but also provides extreme openness.
Final construction phase of Muamp#5.
Making Muamp#5 - custom made with ultra thin headband cross frame. Hardwood surround construction with the new style headband crossframe made of thin metal rod. Thinner and further away from the panel making it acoustically transparent.
Me at the computer with Vectric CUT2D.
Me with my CNC.
CNCing a set of spacers on ½mm Bungard single sided FR4.
Now cutting outer edge.
Cut complete. The multi-edge mill bit leaves a smooth finish.
New style electrostatic headphone cable. Tidier than the last design and still ultra low capacitance.
These are aluminium stators. PCB fabricated as 1mm aluminium sheet covered with a dielectric and then a copper layer. The copper side is tinned and sprayed with polyurethane clear Spray. Although these stator are the most rigid and should be the best out of all the stators I have made, they are not as flat as the Bungard stators. In future I will keep to CNC'ing my stators from Rapid Bungard FR4. Not only is it the flattest of all my stators, I can make them as I need them with changes I decide to make and not needing to write more Gerbers and then waiting for PCB production companies to send a batch in the post.
A test panel, the same as above, but using wire mesh outer dustcover.
The stators, spacers and dustcovers used in the finished item.
Now we're getting somewhere!
Mmmm..., Large panels completely covered in foam was not a good idea.
PCB (FR4) stators and MDF surround. Experimenting with different hole sizes and spacer thicknesses.
Making a Stax compatible cable.
Semi-boxed and nearly ready for use.
A CNC was used to cut the tracks and holes on this PCB for the energiser.
Early work on a valve energiser.
Testing panels with a 'measurement condensor' microphone.
Various test panels with 304 stainless steel and thin neoprene spacers.....
Testing small 'On ear' panels.
My first energiser (transformer type) testing another early panel. In this one I have replaced the plastic spacers with FR4.
Home wound audio toroidals are not easy to wind.
My very first panel. Using two pieces of perforated 304 stainless steel. It uses a basic transformer energiser and isolated mains step-up for the bias.
For a simple panel, it has amazingly good sound.