F3 as headphoneamp?

[Ryssen]

Has it been done?I gues I have to lower the current through the amp.Any advise?

 

[rayma]

Don't go deaf.

 

[Deleted member 544066]

i use an F4 as my headphone amp, but i have hard to drive headphones. Best solid state amp ive heard with headphones. I also used an inline attenuator for headphones that werent so hard to drive.

 

[EUVL]

You first have to change the LU1014 triode cell from 1.3A bias to 200mA.
See :
https://www.diyaudio.com/community/...l-fet-class-a-zgf-headphone-amplifier.225577/

Then you can simplify the Aleph current source with a single LM317HV :
https://www.diyaudio.com/community/threads/hybrid-zen-amplifier-lm317-efficient-and-simple.402477/

Of course you need to adjust resistor values to suit your requirements.
Best to simulate in Spice first.
No copy and paste.


Patrick

 

[Ryssen]

How high should the B+ be,24v,18v or 15v?

 

[Ryssen]

Dynamic audeeze I think 70 ohms

 

[Ryssen]

yes Closed back.

 

[Ryssen]

5w seems a little bit high for headphones.

 

[Ryssen]

I f I go with this model I guess I will have learn spice..

 

[EUVL]

I f I go with this model I guess I will have learn spice..

This is a power amp for 4~8 ohm speakers.
I already told you how to change it for headphone in post #4.
First is to understand how the circuit works.


Patrick

 

[Ryssen]

0.15F on the out, headphones/loudspeakers have 0.25 ohm?.. 🤣
Maybe better to make something like diamond buffer or "dual-railed" single-ended HPA or something else?..
And F3 will build for loudspeakers?.. Anyway the out capacitor must be excellent quality.

I am going to scale it down......