Finished F5

[MJPAudio]

Hi there,

First of all thank you Nelson Pass.
2x Mono F5, 300v Antek toroid, 4x10.000uf, Tech-diy components, Peter Daniel PCB, Heatsink from HeatsinkUSA.

About 10hrs listening to the amplifiers. I am play with Scan-Speak Revelator speakers 2-way 89db and a B1 preamp with 2n3819 (30volt). My previous amp was a TA2024 and listening to the F5 gives clearly a improvement. The only thing i don't get around yet, is that its sounds a little leaner then the TA2024. Not sure if that's the way it should sound or the TA2024 just sounds to rich.

See pics below.

 

[6L6]

Wonderful!!

Our most sincere congratulations on a successful project!

Can you post some photos of the inside?

 

[CanAm Man]

Great job...... really looks nice!

I think the last time I saw heatsinks like that, they were on a Cray II tera-FLOP mainframe!

 

[a.wayne]

Hi there,

First of all thank you Nelson Pass.
2x Mono F5, 300v Antek toroid, 4x10.000uf, Tech-diy components, Peter Daniel PCB, Heatsink from HeatsinkUSA.

About 10hrs listening to the amplifiers. I am play with Scan-Speak Revelator speakers 2-way 89db and a B1 preamp with 2n3819 (30volt). My previous amp was a TA2024 and listening to the F5 gives clearly a improvement. The only thing i don't get around yet, is that its sounds a little leaner then the TA2024. Not sure if that's the way it should sound or the TA2024 just sounds to rich.

See pics below.

Most comments seem to suggest the F5 is lean in the bass regions, this of course will enhance the mid/high when listening ...

 

[qusp]

nice build, love the heatsinks, but i tell you what, thats some of the nicest looking wood cabinets ive seen, very very nice indeed!!

one thing i feel needs saying, there are so many f5 threads popping up to show off the build, is there not another venue for this?

 

[Melon Head]

Nice scanspeak drivers.
What cd player do you use?

 

[qusp]

yeah that slitcone is beautiful. if i hadnt bought my 21w/8554k i would be buying the set that are in the fs area at the moment

 

[osscar]

Great! 😱

 

[EUVL]

Looks like the 8.5" version, 11" long :

8.460" Wide x 11" Long Heatsink - HeatsinkUSA, LLC Store

Simulation with 1 FET per heatsink (for F5 SE monoblock), 32W per FET, 25°C ambient temperature.

Good solution for F5 SE. 😉


Patrick

 

[EUVL]

For balanced F5, or one heat sink for 2 FETs (32W each), going to the 10" version, 12" long will also do.

10.000" - HeatsinkUSA, LLC Store

(Some here would say too hot. Not if you use Keratherm, IMHO.)


Patrick

 

[EUVL]

Going to 10" / 2.5" fins (instead of 1") helps, but only a little and not by a factor of 2.5, as some might imagine.

10.080" - HeatsinkUSA, LLC Store

Patrick

 

[EUVL]

With our F5X Mini Tower (2x heat sink 350x40x380mm* per channel), things are very comfortable again.
* Fischer SK523 380, or slightly thicker still, Conrad MF35-380.

😉


Patrick

 

[EUVL]

There is a query by PM about the data input.

The heat sink types are all listed, so are the lengths for each case..
Ambient temperature is 25°C for all cases.
All natural convection, blank heat sinks with no anodising.

Each "red spot" represents a MOSFET 20x26mm (2SK1530, etc.) dissipating 32W each.
The MOSFET positions you can scale roughly from the plot and the given heat sink dimensions.

That's all. But close enough to reality.


Patrick

 

[juma]

... 4x10.000uf...

Seems a bit thin...

 

[vdi_nenna]

Dig the speakers! I think I saw something like them in an issue of Elektor dedicated to speakers. For some reason, the name Flanders comes to mind, but I could be wrong.

Very nice F5 too!

Vince