F5 power amplifier

[Melon Head]

I am now seriously considering doing monoblocks with this amp.
So P Channel and N Channel output mosfets will be on sepparate heatsinks (ie on each side of the amplifier case).
Will there be any problems in doing this?
I guess this is what is done in the XA 60.5 monoblocks. So it should be doable.
Any advice on this would be appreciated.

[Beftus]

Originally Posted by Lucas_G

I live in the Netherlands and there are not so many options for transformers to use in the F5.

Check amplimo.nl. They offer 300VA, 500VA, 625VA, 800VA toroids with twin 18V secondaries. 500VA should be enough for a F5. Can be bought online @ deaudiofabriek.nl. Success!

[sangram]

Originally Posted by thanh1973

I am now seriously considering doing monoblocks with this amp.
So P Channel and N Channel output mosfets will be on sepparate heatsinks (ie on each side of the amplifier case).
Will there be any problems in doing this?
I guess this is what is done in the XA 60.5 monoblocks. So it should be doable.
Any advice on this would be appreciated.

I'm doing exactly the same thing, except mine will be uncased.

Peter's F5 is built like this as well, and his PCB is perfect for such a task as the devices are facing each other on the opposite sides of the PCB. Of course I will be running open chassis so the ~2" width of the entire assembly does not bother me.

Andrew posted some open questions regarding this arrangement, specially as the output offset depends on the temperature/operating point balance between the two halves and separating them like this means they can't 'talk' to each other. Peter uses a metal sheet to connect the two halves. I'm still wondering what to do, but probably I'll have a thick sheet of aluminum as the 'front panel' connecting the two halves, sliding into the slot on the heatsink.

[jackinnj]

Originally Posted by Nelson Pass

Nice chassis. Did you make it yourself?

They were offered out by another diyaudio-r, and I haven't see 'em in quite a while --

My usual amplifier box is recycled Hewlett Packard or Kepco power supply,and my heat sinks are military or industrial surplus. Because of WAF I use Audio Research in the public rooms of the household.

Edit, the listening room isn't public -- it has a Grizzly mill, an AP analyzer, my modified Thors, a pair of TM5006 mainframes, solder and rework stations, Heath power supplies, HP HV power supplies, a new sony CD/SACD player, tuner which (by intent) only receives AM radio, much-modded Adcom GFP565, a beat up Acoustic Research SP-11, and of course several F4 and F5 amplifiers.

[Nelson Pass]

recycled HP is class. old HP

[nicoch58]

HI Pass

the chassis look like http://diyenclosures.com/products/chassis/diy1013/

as I have one pair

[Jaac]

Originally Posted by Beftus

Check amplimo.nl. They offer 300VA, 500VA, 625VA, 800VA toroids with twin 18V secondaries. 500VA should be enough for a F5. Can be bought online @ deaudiofabriek.nl. Success!

I've recently bought two 300VA 2x 18V toroids directly from the amplimo site. Emailed the guy if he could pot them into metal cans. And they do, that it looks very nice i will post some pictures later on.

[danny_66]

Here's another source for transformers:
http://www.toroidy.pl/index.php?opti...id=6&Itemid=13
They have a range specially made for audio, good prices too.

[samoloko]

Originally Posted by Jaac

I've recently bought two 300VA 2x 18V toroids directly from the amplimo site. Emailed the guy if he could pot them into metal cans. And they do, that it looks very nice i will post some pictures later on.

how much cost additional center potting

Is there Interest at toroidy If so I will buy 1 or 2

[AlanElsdon]

Originally Posted by danny_66

Here's another source for transformers:
http://www.toroidy.pl/index.php?opti...id=6&Itemid=13
They have a range specially made for audio, good prices too.

I have used a couple of their transformers in my Patak style gainclone - they work extremely well; however in the UK we are now at a disadvantage (GBP vs EUR), but elsewhere in Europe I expect their prices are still good.

Ps these are the transformers I believe PD uses for his own Pateks (apologies Peter if that is not the case)