Jag tvivlar faktiskt lite på att denna hörlursförstärkare är värd pengarna.
- En makalös makapär.jpg (199.9 KiB) Visad 4147 gånger
http://www.ebay.com/itm/Battery-Tube-Only-Headphones-Amplifier-for-Sennheiser-HD-580-600-650-Beyer-DT880-/332099672333?hash=item4d52aed90d:m:mF9seOwKkeTVkvtflEI3g-gThe Pleiades Electra is possibly the most transparent amplifier on earth. Contains no other components except 2 EF98 tubes for both (stereo) channels. The tubes are in cathode follower configuration and the headphones themselves are the cathode resistors. For the schematic Only please visit my other items or the euroelectron blogspot.
An electron tube on its own has a flat frequency response from 0Hz to many MHz. The surrounding components restrict this and limit the magic of music in other ways too. This is possibly the first amplifier on earth using 2 electron tubes and no other component.
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. A volume control may be added upon your request.
Reserving the right to make revision changes. Handling time is approximately 30 days. This amplifier is only suitable for high impedance stereo headphones such as the Sennheiser HD-580, Beyer DT880 or equivalent..
Specifications:
---Bandwidth <<0.000001Hz to >>MHz (DC to RF)
---12V extremely low noise battery operation
---Power consumption < 7W
---Input impedance >>MOhm
---No resistors, potentiometers
---No capacitors
---No transformers or 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
