Just saw this up on Ebay. A metal frame, 2 Tubes and some wires for a mere $70.000.
What do you think? ;)
Specs/description copied from the Ebay auction:
Pleiades Electra, possibly the most transparent amplifier on earth. No other components except 2 tubes for both (stereo) channels.
For the schematic Only please visit my other items.
An electron tube on its own has a flat frequency response from 0Hz to many MHz. Surrounding components restrict this and limit the magic of music in other ways too. This is possibly the first amplifier on earth using electron tubes and only.
Since the signal passes through an electron tube and nothing else, the amplifier is possibly the closest there is to a wire with power gain!
Gain being fixed it must be connected to a passive preamplifier or a source that has variable output. Volume control may be added on your request.
Item may not look exactly the same, reserving the right to make revision changes. Handling time approximately 30 days. This amplifier is only suitable for high impedance stereo headphones such as the Sennheiser HD-580, Beyer DT880 or equivalent..
Bandwidth <<0.000001Hz to >>MHz (DC to RF)
12V extremely low noise battery operation
Power consumption < 7W
Input impedance >>MOhm
No resistors, potentiometers
No transformers, inductors
No solid state, diodes, transistors, FETs, ICs
The signal is amplified by only 2 electron tubes in class A.
Only suitable for headphones with impedance >150, <600 Ohms