F5 power amplifier

[cjkpkg]

Well if I redo the PSU, do I get another set of psu boards and another 300VA xformer or just replace the existing with a 600VA unit?

It would be easy to add another 22,000 uF per rail.

 

[dantwomey]

Well if I redo the PSU, do I get another set of psu boards and another 300VA xformer or just replace the existing with a 600VA unit?

It would be easy to add another 22,000 uF per rail.

Recommended 300VA per channel?

Regards,
Dan

 

[labjr]

I don't think it matters much if you do mono or stereo. Try adding the capacitors first. I just wonder if the 300VA Antek is enough transformer. Most have built the F5 with a 400VA Antek. Won't hurt to have a little extra.

 

[danieljw]

Having built one myself i have a much heavier duty power supply.

however i think the issue may be gain i find mine sounds better with a preamp of some sort in front of it.

depending on the output of your source unit.

i am listening to mine everyday at the moment

-Dan

 

[Bigun]

Dan,

How would you compare the sound of your F5 with your Le Monstre - the F5 looks like it came from the same DNA ?

 

[danieljw]

Hi Bigun,

The F5 has less gain, has a very low noise floor (supply/build/case affects this)
And a very natural sound. i think the F5 sounds a little more laid back than the monstre but is not dissimilar.

both are really nice

-Dan

 

[danieljw]

Also you are right about the DNA - i used the same case with modded supply for the F5

however i opted for a regulated supply with alot of capacitance

-Dan

 

[pixeljedi]

Dan,
I would personally go for the 470000uf panasonic one's on Ebay.
2pcs Panasonic Radial Capacitors 47000uf 25v 85C - eBay (item 200449742234 end time Apr-12-10 09:54:46 PDT)
I've bought other stuff from this guy before. Quick service.
I use 4x 47000uf Panasonic's in my F5. Under load, the are 22.5v on V+, at least on mine.

Thanks for the link! Just ordered 10

 

[Renron]

Thanks for the link! Just ordered 10

With that much capacitance don't forget the soft-start thermistors, or you'll own stock in a fuse company.

Ron

 

[bobodioulasso]

These are "general purpose" quality.
An F5 deserves better than this. Something like high ripple, low ESR.
Quantity does not replace quality .

 

[labjr]

These are "general purpose" quality.
An F5 deserves better than this. Something like high ripple, low ESR.
Quantity does not replace quality .

Which "these" are you referring to?

 

[bobodioulasso]

Those Panasonic one were speaking about.

 

[umut1001]

Hi.I am selling some new Kendeils and i am going to use them for my F5 amplifier too.They are great quality made in Italy capacitors and the stock is going down day by day http://www.diyaudio.com/forums/swap-meet/163913-50v-68000uf-kendeil-caps-sale-2.html

 

[labjr]

Those Panasonic one were speaking about.

Doesn't the First Watt F5 use general purpose Panasonic Capacitors?

 

[Renron]

Hi.I am selling some new Kendeils and i am going to use them for my F5 amplifier too.They are great quality made in Italy capacitors and the stock is going down day by day http://www.diyaudio.com/forums/swap-meet/163913-50v-68000uf-kendeil-caps-sale-2.html

We now return you to your regularly scheduled broadcast......

Ron

 

[bobodioulasso]

Doesn't the First Watt F5 use general purpose Panasonic Capacitors?

I do not think so.

 

[gk7]

Doesn't the First Watt F5 use general purpose Panasonic Capacitors?

They are Panasonic THSA (Datasheet says "with high ripple current capability") and they are reasonably priced:
Panasonic TSHA

 

[labjr]

I do not think so.

It appears First Watt uses capacitors with 85c ratings. As fas as I can tell the 15,000uf/25v is only available in TS-UP and TS-UQ series which are both general purpose.

If they're good enough for First Watt, I think they're good enough for anybody here.

 

[Renron]

They are Panasonic THSA (Datasheet says "with high ripple current capability") and they are reasonably priced:
Panasonic TSHA

I'm using those TSHAs and have Zero complaints.
8 x 22,000uF 35V 105*, solid bass and highs as light and clear as a snowflake. Thanks Papa!

Ron

 

[gervenja]

I am using these baby's,
up and running for a few days now and I am happy with them.
Had to fix a B1 buffer for it was to loud directly connected to my cdplayer