First Watt F4 and F8

Hi at DIY Forum

Im new here.

And not exactly sure if the reason of my question have been discussed here before.

But anyway :

Is it possible to buy ALL the parts, needed to build the First Watt F4 and / or the F8 amp. Including PSU's and pre-drilled chassis and heatsinks ?

Best regards from Denmark 👍🤗

Alf Agerup
 
Hello Alf,

If you mean buy it from the single source, than answer is probably no.

Idea of building firstwatt amplifier is very good one. I don't think F8 is released to public yet. F4 is very nice amplifier, just bear in mind, that it has no voltage gain, so you need suitable / high gain pre for its rated power. And preferably a good pre as it will sound as good as your pre sounds.

Anyway it's not a hard task to source everything needed. On F4 example you can source:
1. Jfets, Other semis, amplifier and powersupply pcbs from diyaudio store
2. Case directly from modushop (it doesn't make sense to pay import taxes and over-sea transport, while it's made in EU)
3. All other parts from shop like Mouser / Farnell / TME
4. Optionaly you can source toroid from place like toroidy.pl

When you decide on certain amplifier, you can start, or join thread in Pass labs sub forum, you will get better support in there. Others can for example check your parts list / shopping cart.

Happy building
Lukas
 
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music soothes the savage beast
Joined 2004
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Hi at DIY Forum

Im new here.

And not exactly sure if the reason of my question have been discussed here before.

But anyway :

Is it possible to buy ALL the parts, needed to build the First Watt F4 and / or the F8 amp. Including PSU's and pre-drilled chassis and heatsinks ?

Best regards from Denmark 👍🤗

Alf Agerup
Definitely no.
 
There is no single source F4 parts kit but still completely buildable given current supply:
F4 boards, the Build of Materials (BOM) is linked here as well: https://diyaudiostore.com/collections/power-amplifier/products/f-4

Pre-drilled, ready-to-assemble chassis: https://diyaudiostore.com/collectio...mate-amplifier-chassis?variant=39313326211145

The F4 thread discussing the amp circuit itself: https://www.diyaudio.com/community/threads/f4-power-amplifier.97540/

The F4 build thread walking thru assembly once all parts are in hand:
https://www.diyaudio.com/community/threads/a-guide-to-building-the-pass-f4-amplifier.234355/

As others have mentioned, a diy F8 is unobtainium at this point.
 
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