Pass DIY Addict
Joined 2000
Paid Member
Very cool implementation! I like the minimalist approach and use of materials.
F5TV3 monos finally finished
Here are some pics and details of my F5TV3 monos.
Bias per Nch/ Pch is currently at 2.4A per ch and heatsinks run around 44F above ambient. Should be no problem meeting design target of 100W Class A when bias is turned up to 2.5A. Voltage under present load is 46V.
Antek transformer mounted on separate sub chassis that rests on its own feet.
Toshiba Mosfets used.
Heatsinks USA heatsinks 4.5in x 20in on each side.
Store boards were drilled to accept 14AWG teflon coated silver copper wiring
No turn on or turn off noises or hums at all. Dead quiet. Very transparent relaxed sound after only 30 hours of use.
A big thank you to Nelson Pass for sharing his design on diyaudio and to everybody here who have patiently answered my many questions.
Nash
Here are some pics and details of my F5TV3 monos.
Bias per Nch/ Pch is currently at 2.4A per ch and heatsinks run around 44F above ambient. Should be no problem meeting design target of 100W Class A when bias is turned up to 2.5A. Voltage under present load is 46V.
Antek transformer mounted on separate sub chassis that rests on its own feet.
Toshiba Mosfets used.
Heatsinks USA heatsinks 4.5in x 20in on each side.
Store boards were drilled to accept 14AWG teflon coated silver copper wiring
No turn on or turn off noises or hums at all. Dead quiet. Very transparent relaxed sound after only 30 hours of use.
A big thank you to Nelson Pass for sharing his design on diyaudio and to everybody here who have patiently answered my many questions.
Nash
Attachments
Thanks Walter. I learned a lot from studying your build in which you discussed the merits of clamping the Mosfets.
Nash
Aleph 5 (No1)
Since 2009 to present I've made few Nelson's amplifiers.
Thank you Mr. Pass!
The first Aleph 5 is assembled from recycled electronics, housing is not very nice but it is robust and functional, it’s completelly DIY.
Power supply is dual-mono, 2x350VA xformers, CLC 56mF+2,2mH+ 56mF (total 448mF) .
In the meantime there was some improvements over the previous version (replaced transformers, high quality passive components, etc.)
More pictures here
Since 2009 to present I've made few Nelson's amplifiers.
Thank you Mr. Pass!
The first Aleph 5 is assembled from recycled electronics, housing is not very nice but it is robust and functional, it’s completelly DIY.
Power supply is dual-mono, 2x350VA xformers, CLC 56mF+2,2mH+ 56mF (total 448mF) .
In the meantime there was some improvements over the previous version (replaced transformers, high quality passive components, etc.)
More pictures here
Attachments
First Watt F5 (No2)
And the last, F5 classic, power supply is dual-mono, 2x150VA 33mF-0,47-33mF. Housing is DIY.
More photos by phases of construction:
housing construction
assembly housing
assembly and testing
Finish
That's all,
regard
P.S. I apologize for spelling errors, blame google 🙂
And the last, F5 classic, power supply is dual-mono, 2x150VA 33mF-0,47-33mF. Housing is DIY.
More photos by phases of construction:
housing construction
assembly housing
assembly and testing
Finish
That's all,
regard
P.S. I apologize for spelling errors, blame google 🙂
Attachments
Last edited:
Fugly!
though , I see you skimped on XLRs ......
You always flies at half of my writing
I have nothing balanced in the system, I don't need them for now 😉
Pass DIY Addict
Joined 2000
Paid Member
Wow - that is some construction - using gold coins as mosfet washers ;-)
VERY nice execution on the build!
VERY nice execution on the build!
ZP,
what's the reasoning behind the completely open bottom panel and the (odd attached) sub-chassis ?
(Most effective way to cool electrolytics is at the ends, btw. Some folks even use thermal goop, in particular with stud/nut mount cans)
Yes, there is plenty of space but do not know if it is necessary, the amplifier has excellent sound and without motor-rans.
This shall be decided our friend Woland and his junior ... propose to him when you see him.