F5 Turbo Circuit Boards

[AndrewT]

The continuous power demand of a ClassA amplifier does give the rectifiers a difficult job.

Generally a small heatsink within a cool air volume that is free to escape, lowers the rectifier temperature adequately.

 

[jacco vermeulen]

8 Hexfreds heat up a plate to almost 60°C

So do not use HEXFREDs (or at least not HFA08tb60)

 

[studiostevus]

Sorry guys... bailing out, will build a normal F5 first before venturing into Turbo...

 

[Rush]

Sorry guys... bailing out, will build a normal F5 first before venturing into Turbo...

You know, with these boards you can build a normal F5 and then have the flexibility to turbo it later.

Rush

 

[UKToecutter]

Prototype boards should be arriving tomorrow.
Quite exciting............

 

[Rush]

Prototype boards should be arriving tomorrow.
Quite exciting............

Excited too!

 

[Horio]

Nice! Looking forward to seeing/hearing how they turn out. 🙂

 

[UKToecutter]

Just arrived.

They look stunning in black !!!

 

[Daniel(Del)]

Photos photos photos!

 

[labjr]

Just arrived.

They look stunning in black !!!

Maybe they'll sound better with a blacker background.

 

[UKToecutter]

oh....

OK. Gimme 5 minutes to find my camera...

 

[Daniel(Del)]

hehe 😀

 

[UKToecutter]

OK,

Here they are.

PSU Board

SE Input Board

Balanced input board

Single Output Board

F5 V2 Combo Board

V2/V3 Output Board

 

[UKToecutter]

1 sec. Photos will be back in a mo

Changed the photos as there was too much flash glare.
I had to take the boards outside into the garden to photo without flash.

 

[Daniel(Del)]

Guys... What do you think about using the case of this amplifier to build F5T?
It was an amp made around 20 years ago.

It's original specs (don't know how true they were, perhaps a little too pretencious given 950VA power consume on max. signal):
200W RMS @ 8 Ohm
325W RMS @ 4 Ohm

The case dimensions are:
420 x 185 x 430 mm (WxHxD)

PS: The fins are bigger then they appear on the photos. I'm going to measure them myself and post them here.

More photos/specs:
AUDIORAMA - Equipamentos de Audio - NASHVILLE A77is
AUDIORAMA - Equipamentos de Audio - NASHVILLE Amplificador

Thanks!

 

[6L6]

Daniel - That chassis look like it could handle a F5v2 easily. I like it. 🙂

Toecutter - Wow! Wonderful!! Thanks for posting the photos!!!!

 

[Daniel(Del)]

Really beautiful!

 

[a.wayne]

Sweet ......

 

[Daniel(Del)]

Daniel - That chassis look like it could handle a F5v2 easily. I like it. 🙂

It seems I won't be able to use the diodes, right? There won't be enough room to place the two output boards on top of the other with the diodes, because of the case height, and the depth is not enough for allowing them side by side.

 

[UKToecutter]

You could build a V2......