SESS
There is Andrea Ciuffoli's SESS Tube Headphone Amplifier (SESS means "single-ended, single-stage, single-tube") :
http://headwize.com/projects/showfile.php?file=ciuff4_prj.htm
There is Andrea Ciuffoli's SESS Tube Headphone Amplifier (SESS means "single-ended, single-stage, single-tube") :
http://headwize.com/projects/showfile.php?file=ciuff4_prj.htm
Keep it simple
I must confess that I am predisposed to like simple designs. If a simple amplifier also sounds good, I probably want it. Usually, if a more complex design is the only known way for significant improvement, then I will choose the more complex one.
On the other hand: If a triodised EL95 can give you about 1 W output then I am quite sure that a half of ECC83 can give 50 mW as well. If the headphone's sensitivity is about 100 dB / 1 mW then you have enough reserve for 117 dB. Do you need more?
I must confess that I am predisposed to like simple designs. If a simple amplifier also sounds good, I probably want it. Usually, if a more complex design is the only known way for significant improvement, then I will choose the more complex one.
On the other hand: If a triodised EL95 can give you about 1 W output then I am quite sure that a half of ECC83 can give 50 mW as well. If the headphone's sensitivity is about 100 dB / 1 mW then you have enough reserve for 117 dB. Do you need more?
Hi all,
I am planning to build Morgan Jone's headamp but i want it not only as headamp but also as linestage. Anyone can help me what modify the circuit for this purpose?
TIA
I am planning to build Morgan Jone's headamp but i want it not only as headamp but also as linestage. Anyone can help me what modify the circuit for this purpose?
TIA
An externally hosted image should be here but it was not working when we last tested it.
Last edited:
Hi,
That should work as a line stage without modification.
R7 could be higher, maybe 470k.
Gain may be a little high... if so try reducing R8 to 47k.
Circuit assumes no DC on the input (or use capacitor).
Another version is here:
The Cavalli Jones Headphone Amplifier
The Cavalli Jones Headphone Amplifier
That should work as a line stage without modification.
R7 could be higher, maybe 470k.
Gain may be a little high... if so try reducing R8 to 47k.
Circuit assumes no DC on the input (or use capacitor).
Another version is here:
The Cavalli Jones Headphone Amplifier
The Cavalli Jones Headphone Amplifier
For a linestage; yes, those values should work well.
However for a headphone amp, if the headphones are low impedance (30 R), then you may need R8 to be 100 k. The reason is that output impedance forms a voltage divider with the load, meaning that the gain must go (back) up to compensate.
Perhaps best is to make R8 variable from 47 k to 100 k.
Good luck with it.
However for a headphone amp, if the headphones are low impedance (30 R), then you may need R8 to be 100 k. The reason is that output impedance forms a voltage divider with the load, meaning that the gain must go (back) up to compensate.
Perhaps best is to make R8 variable from 47 k to 100 k.
Good luck with it.
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