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X5HV - the F5 principle applied to a headphone amp
X5HV - the F5 principle applied to a headphone amp
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Old 13th January 2021, 09:30 PM   #51
hesener is offline hesener  Germany
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X5HV - the F5 principle applied to a headphone amp
Patrick, this is a fantastic piece of work, congratulations!

Thats a nice amount of power dissipation however, 70W (250V x 0,07A *2 (pos and neg) *2 (for both channels), I guess this wins the competition for output power to power dissipation ratio

Well it is negative temp in Munich and snow outside, so that would certainly help....

Just now (~1 week ago) I finished my new preamp which has the X5HV modules inside as well, 8 years in the making - finally I get to listen to what I was building back then, and what got this thread started. It does sound very nice
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Old 13th January 2021, 11:58 PM   #52
EUVL is offline EUVL  Europe
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Good to hear that I am not the only one.


Best reagrds,
Patrick
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Old 14th January 2021, 07:21 AM   #53
hesener is offline hesener  Germany
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X5HV - the F5 principle applied to a headphone amp
Did you try yours with a headphone? I am curious to know if the higher bias current is making a difference.
In fact, with this level of standing current, it might be appropriate for an electrostatic speaker, although the voltage levels might not be sufficient given the larger distances membrane - stators.
At some point I was considering building electrostatic supertweeters (10kHz up) with a little 3D printed horn, where this amplifier came in handy.... guess it will take another 8 years or so....
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Old 14th January 2021, 01:16 PM   #54
EUVL is offline EUVL  Europe
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The pair of boards were given to a friend who is in the process of housing them properly.
With regulators, etc. Slow progress.

Are you not going to show us some photos ?


Patrick
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Old 14th January 2021, 07:27 PM   #55
hesener is offline hesener  Germany
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X5HV - the F5 principle applied to a headphone amp
Of course Sorry for the delay, we had a online wine tasting this evening (hosted by the german magazine ZEIT, and themed around Beethoven) which was very nice.....

Here you can see the preamp front and back, it is fully symmetrical as is the X5HV, along with a nice teflon socket for the STAX headphone and adjustable polarisation voltage. The phono stage is the RTP5 circuit from Allan Wright / Vacuumstate, and the line stage is the same as Acoustic Research AR25. The coupling caps are Jantzen Silver caps and the RIAA caps are Military NOS KS caps from Siemens, that I recovered when my father passed away and we cleaned up the house, years ago.

The inside picture shows the phono and line stage on the left side, built on white teflon boards, and the headphone amplifier is the same as it was 5 years ago, mounted into the chassis vertically so the hot air can drift upwards.

Hope you like it!
Attached Images
File Type: jpg preamp1.jpg (311.6 KB, 66 views)
File Type: jpg preamp2.jpg (105.0 KB, 65 views)
File Type: jpg preamp3.jpg (111.1 KB, 63 views)
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Old Yesterday, 07:48 PM   #56
EUVL is offline EUVL  Europe
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Thx,
Patrick
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Old Today, 09:23 AM   #57
hesener is offline hesener  Germany
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X5HV - the F5 principle applied to a headphone amp
Small correction, the line stage is the LS25 from Acoustic Research, sorry for the mistake.
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Old Today, 09:26 AM   #58
hesener is offline hesener  Germany
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X5HV - the F5 principle applied to a headphone amp
So I guess my build looks a lot more like done with a hot needle, while your builds are admirably beautiful..... Sigh.... Its rather a prototype, modified in action and upgraded while building, and it works fine, so I am ok with it

By the way, next in line is my F5X, with the kit sitting in the basement, waiting for me to finally go for it!
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Old Today, 10:10 AM   #59
EUVL is offline EUVL  Europe
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Morde just finished his in record time and is totally satisfied.
He has reduced bias to 1.5A to keep heatsink temperature lower.
F5X -- the EUVL Approach - The Build Thread

Also some dual diodes to try.
Contact him direct for details / rectifier PCBs.


Patrick
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Old Today, 12:31 PM   #60
hesener is offline hesener  Germany
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X5HV - the F5 principle applied to a headphone amp
very nice build! getting that itch.....
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