FSSA amplifier build thread with review

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#202
Thanks ClaudeG
To all group buy participants
You should have received the new version of the build manual by email for those who have already paid.
Note: R39 does not exist in the input stage test schematics. FSSA1 schematics version has some designations parts values inconsistencies to be corrected in a next release of build manual...🙄

I should be able to order FSSA pcb in a day or two.

Fab
 
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#203
Enjoy the build fellas

For me I'm satisfied if I only need to keep one I will keep fssa 2,

So it's a good idea to splurge on a good casing with big heatsink and oversized transformer make it look good and sound good. The preamplifier is also fantastic, it was reviewed again yesterday.. Nobody can find fault in it and it just perform as good as it should be

The speciality of this preamplifier is huge deep 3d stage with good focus. Very realistic and analog at the same time, very good drive yet subtle . Very linear and does not color the sound


It's what hi end is after.. Huge, real and transparent. Easily amongst the best with even commercial products, but you can build it for a mere couple hundred bucks..if you really like it splurge on a really good potentio
 
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#210
Hi Vunce

Just a question for my very own understanding...

You wrote: "I've got a question about HS size, would a 300mm x 150mm x 50mm heatsink per channel be sufficient to support the FSSA2 being powered with 48vdc @ 600mA bias current and 8R load?"

Is the load relevant to that calculation and if so how? I thought just bias and voltage, so wondering as personaly more looking into 4R.

Thanks again Vunce!

Claude
 
#213
Why not .. if heatsink is enough higher voltage higher bias . That would be really godzilla roarrr

You gotta test them

What I did is touch the transistor .till it's not burning hot after big loud bass song, at 800 it is burning hot, but heatsink is only 45 hottest.actually I think I can easily hit 1amp but ..thinking how hot our weather can be and longevity sake .. I just use 700ma. I want this amp to last as long as I can.

Also highly depedant on how low the impedance of speakers . 8 ohm it's very cool
 
#214
Also ..there is a zenmod trick

Enlarge the 3mm hole to 4mm hole on transistor use 4mm bolt and ring,
Buy 4mm hole heatsink ceramic pad

Mount final as close as 1/3 way from bottom

Maximise cooling effect and it's rock solid


As the saying goes ..m3 are for sissies

Also my usspa is 200ma @17v.. use a bigger heatsink..
YouTube

To my ears almost vfet like
 
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