F5 power amplifier

[Luke]

On my Parallel caps I did it like this, because of the nice color contrast with the copper wire and brass bolts on caps, how ever doesn't always make good contact maybe didn't get all the enamel off the wire or not a good way ?.

An externally hosted image should be here but it was not working when we last tested it.

Hi awc,

try soldering your copper cable to one of these ring terminals.
3.2mm Ring Terminal Red 10pk | R1-3V

should give you a better contact. I also ise these with flat ofc cable I bought a while ago. Looks sharp and can handle lots of current. Yours is a little on the lean side IMO.

 

[Luke]

Ive used in parallel 11 Mallory 6400 uF 60 vot 45x80mm they not quite fitting for this circuit but they give a nice tone and detail etc to the amp in front of them i have 4 10.000 in serial with ov to earth on them. small caps I suspect have better ESR but using what i had still have 30 6400uF if any one what some ?
NOS. I cant even use them for door stoppers they just roll away.

You got any 100V 10000uF+ caps?

 

[awc]

No 100v sorry, I sell on trademe under name of "kirwee"

 

[Luke]

ok thanks

 

[ma_coule]

ok thanks

Hi Luke,
I've found Kendeil 100V caps here:
kendeil - Offerte kendeil, Audio, TV, Elettronica, Commercio e Industria su eBay.it
Maybe helps...

 

[Luke]

thanks Ma_coule,

Its shipping that makes it too expensive.

 

[rmsds]

Keindel caps

Hi Luke,
I've found Kendeil 100V caps here:
kendeil - Offerte kendeil, Audio, TV, Elettronica, Commercio e Industria su eBay.it
Maybe helps...

There is also an ongoing thread about a "GB" of sorts of Keindel caps. It started with some 50V ones but they are now looking for interest in 100V caps:
http://www.diyaudio.com/forums/swap-meet/163913-50v-68000uf-kendeil-caps-sale-6.html#post2195175

 

[bear]

bear, Ive just been looking at your site, and the way your power supply done on Symphony amp, its brilliant I'll get some copper I think,
you have to transformers in parallel ?

Thanks for the compliment - if you want to discuss, it needs another thread elsewhere as it is not a Pass thing. If you start one, give me a heads up so I know?

Let's just say for now, "it is one way to do things".

_-_-bear

 

[bear]

Luke, I would opt for heavier gauge wire. One choice that is inexpensive is 12ga or not quite as good 14ga solid core AC mains wire (the stuff that goes in walls)...

_-_-bear

 

[tinitus]

If you have matters that doesnt concern F5 you might also use your mail account/PM

 

[Luke]

Luke, I would opt for heavier gauge wire. One choice that is inexpensive is 12ga or not quite as good 14ga solid core AC mains wire (the stuff that goes in walls)...

_-_-bear

I know me too, isnt that what I suggested?

 

[Marra]

Thanks JackinJ my mosfets have arrived.

 

[bear]

sorry, "awc" was the intended party...

 

[meanman1964]

Can you use a 2x21Vac toroid instead of a 2x18Vac for this amp?

 

[bobodioulasso]

Can you use a 2x21Vac toroid instead of a 2x18Vac for this amp?

Yes with a capacitance multiplier to drop a few volts.

 

[meanman1964]

Yes with a capacitance multiplier to drop a few volts.

??

 

[bobodioulasso]

Look at Zen V9 article and it's active filter supply.
You have to build one on the negative rail also using an irfp9240.

 

[cviller]

??

The voltage 21VAC will give you rails that are too high for the jfets. You can lose a few volts in a cap multiplier like suggested - google around to learn more, they are quite nifty. Here is a basic explanation:
Capacitance multiplier - Wikipedia, the free encyclopedia

You can also lose the volts in with a cascode of the frontend, but that is at least as complicated. 😉

 

[bobodioulasso]

I draw the zen cap mult with its symetrical

 

[meanman1964]

Thanks Bobo very clear now