High end tube Headphone amplifier - DIYPARADISO
High end tube Headphone amplifier
This project started on request of a client , after viewing some websites
And going through some magazines ( glass audio , sound practises )
I realised it’s nothing more then a small SE mini amp .
The simple circuits often offer the best sound , and you get what you pay for .
All components are crucial , since there are so few of them , the only negative to this type of circuit is that its very sensitive to hum in the powersupply .
Basically you can use any tube in the amp section that falls more or less in the same specs
Suitable tubes are :
ECC81 , 6H30 , 6SN7 , 6BL7 , 6BX7 , 6DN7 , 12BH7 and many more ,
Even a 6V6 or 6F6 or EL84 can be used .
I propose however 2 versions to show you the general setup ,
Schematic is identical and powersupply also
Note the voltage can be varied by changing the first capacitor .
Without it the max voltage Ucc (40mA drawn ) will not exceed 175 volts
With it (say 47µF ) you can obtain about 300Vdc with (40mA)
Basically :
Super high quality no compromise Panasonic precision plastik film pot
50K log for volume control
Lundahl iron , an outputtransformer is necessary to drive the low impedance headphones
They can be from 32 to 600 ohm and more but not lower as 32 ohm
Tube rectified powersupply for smooth sound , lots of chokes for channel separation and filtering , big caps for ripple reduction .
Filaments run on DC , guarantying no hum from power supplies through filaments .
Version 1 :
V1 is 5842
Zo = LL1660/30mA
The secondaries are in series and used as primaries
The primaries are paralleled and used as secondaries
R1 = 100 ohms
Version 2 :
V1 is half of 6189W or 5814A oe ECC82
Zo = LL1630/10mA
The primaries in series
The secondaries in series
R1 = 330 ohms
All parts are supplied , but no real kit exists , we offer a nice housing but the holes need to be drilled , we will offer a pcb and a paper drawing to help drilling .
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