DIY F5 pure class A power amp(Nelson Pass design)

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Re: DIY F5 pure class A power amp(Nelson Pass design)

Postby philpath » Thu Sep 20, 2012 12:24 am

endrik35 wrote:
brainf wrote:
trod93 wrote:Great job on the amp and preamp. Awesome look! Kapag nakakakita ako ng ganitong trabaho parang gusto ko na rin matuto ng electronics. Congrats!


Can't take any credit for this. Before i met Doc E. I was content with diy projects that were working and safe. Now they have to be aesthetically pleasing too! Haay... i spent more time working on then chassis than on the board and testing :lol:

Definately a positive evolution :clap: Thanks Doc.

Btw this project is not complex or hard to build at all. Sourcing good components from all over is the difficult part!



You're too kind Les. I believe that form and function goes hand in hand. . .but I also believe in the "sleeper" look! Looks ordinary but when it sounds off . . .! Kaboom! Tulala lahat! ;) Pangulat lang. More power on your magnificent builds and Godbless!


Thus one of the effects of the real "UPGRADE KING" on us mere mortals. Form and function are the mantras of the real "UK"!!!!!!!!
Last edited by philpath on Thu Sep 27, 2012 12:00 am, edited 1 time in total.
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Re: DIY F5 pure class A power amp(Nelson Pass design)

Postby brainf » Thu Sep 20, 2012 8:43 am

endrik35 wrote:I've read that master jojoD is making an F5 power amp mated to a dcb1 preamp. Same setup as yours Leslie. I'm very happy about this diy craze. I'm pretty sure master jojoD's build will be awesome too. Napapadalas bisita ko kay Leslie just to hear the dcb1 and F5. Even at low volume, details abound with tactile bass! Thanks Nelson Pass for sharing your gifts! :) Loi, paguwi mo, sabay na kayo ni Obet at Tony! I assure you na hindi mawawala ngiti niyo. . . ;)


Always a pleasure having you over Doc. Will let you know once it's in its final form (still waiting for those Caps...). Looking forward to having you folks over.

cheers.
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Re: DIY F5 pure class A power amp(Nelson Pass design)

Postby endrik35 » Sat Oct 13, 2012 8:05 am

Finally, the industrial grade Cornell Dubilier caps (33,000 microfarads each) arrived last week and was installed on the F5

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Sound wise(accdg to leslie), he had to turn off his MK subs because the bass output of his Monitor Audio RS6 increased considerably. If you noticed the fiberglass board, there are two slots left for 2 more caps. Other SQ findings will be filled in by Leslie(brainf). This guy is a happy camper and imho has hit the jackpot with this DIY project! HAIL NELSON PASS!!! :clap: :clap: :)
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Re: DIY F5 pure class A power amp(Nelson Pass design)

Postby edrel sison » Sat Oct 13, 2012 8:20 am

congrats leslie! nice one doc endrik!
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Re: DIY F5 pure class A power amp(Nelson Pass design)

Postby Tjaderman » Sat Oct 13, 2012 8:28 am

Baka naman ikaw ang happy camper, Doc "UK" Endrik!!.... :lol: :lol:
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Re: DIY F5 pure class A power amp(Nelson Pass design)

Postby endrik35 » Sat Oct 13, 2012 8:32 am

thanks Sir Edrel and Cal. . .kung aken lang sana yung F5. . .hu hu hu :(
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Re: DIY F5 pure class A power amp(Nelson Pass design)

Postby AbadSantos 7 » Sat Oct 13, 2012 6:26 pm

endrik35 wrote:Finally, the industrial grade Cornell Dubilier caps (33,000 microfarads each) arrived last week and was installed on the F5

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Hi Doc,

Isn't 25V Caps is too low for the existing rail voltage?

I have with me 2 pairs of F5 Turbo Main Board rated at 100W Class A.

Tig-isa tayo? Gusto mo? Mura lang.. :devil: :devil: :devil:

Cheers.
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Re: DIY F5 pure class A power amp(Nelson Pass design)

Postby brainf » Sat Oct 13, 2012 7:18 pm

edrel sison wrote:congrats leslie! nice one doc endrik!


Thanks Edrel... the caps are doing your traffo justice. Will get the final "bits" from you and then I can call it a completed project. (Fully debugged already and ready for final wiring). :)
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Re: DIY F5 pure class A power amp(Nelson Pass design)

Postby brainf » Sat Oct 13, 2012 7:22 pm

endrik35 wrote:thanks Sir Edrel and Cal. . .kung aken lang sana yung F5. . .hu hu hu :(


Haha! You're welcome to a home audition anytime Doc. Too bad the girls took over the sala when you came by. Yep no more sub duties for the MK for audio now :(
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Re: DIY F5 pure class A power amp(Nelson Pass design)

Postby brainf » Sat Oct 13, 2012 7:28 pm

AbadSantos 7 wrote:
Hi Doc,

Isn't 25V Caps is too low for the existing rail voltage?

I have with me 2 pairs of F5 Turbo Main Board rated at 100W Class A.

Tig-isa tayo? Gusto mo? Mura lang.. :devil: :devil: :devil:

Cheers.


My build is the standard (non-turbo) version which runs on 25V DC rails (hence only 25W into 8 ohms) :) Voltage after rectification and filtering is approximately 23.5VDC.

Cool - you have the F5 Turbo boards, start scouting for a REALLY BIG chassis for that monster! :rock:
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Re: DIY F5 pure class A power amp(Nelson Pass design)

Postby AbadSantos 7 » Sat Oct 13, 2012 8:26 pm

brainf wrote:
Cool - you have the F5 Turbo boards, start scouting for a REALLY BIG chassis for that monster! :rock:


Hi Les,

Yes this is the version 3.

For the Chassis should be no problem. I found an ACCUPHASE P Series Clone Gold Face Plate Chassis Already.

A little costly but im planning to purchase by next month.

Hi Doc Endrik....Mag F5 ka na :devil: :devil: :devil:
Mura lang pati Chassis hindi magiging problema... may kasama pang metro :devil: :devil: :devil:
Kaya lang may problema sa metro...may lente :geek: :geek: :geek:
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Re: DIY F5 pure class A power amp(Nelson Pass design)

Postby endrik35 » Sat Oct 13, 2012 9:06 pm

Thanks for posting Loi. Naglalaway ako sa casing! Napakaganda! What do you mean na may problema sa metro? Magnified yung vu panel? ;)
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Re: DIY F5 pure class A power amp(Nelson Pass design)

Postby AbadSantos 7 » Sat Oct 13, 2012 9:13 pm

endrik35 wrote:Thanks for posting Loi. Naglalaway ako sa casing! Napakaganda! What do you mean na may problema sa metro? Magnified yung vu panel? ;)


Hi Doc,

Joke lang.. :lol: :lol: :lol:

Pero ung chassis...seryoso ah...
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Re: DIY F5 pure class A power amp(Nelson Pass design)

Postby AbadSantos 7 » Sat Oct 13, 2012 11:45 pm

endrik35 wrote:Thanks for posting Loi. Naglalaway ako sa casing! Napakaganda!


Doc...tuloy na natin paglalaway mo :devil: :devil: :devil:
I think you can decide easily now to go for F5 Turbo V3...

Hi Les,
Help me more to push the good Doctor to dive for Class A 100W :devil: :devil: :devil:
so that your F5 will have a father of its own :lol: :lol: :lol:

BTW, Congrats. If you need my help for your next project just send me a PM.

Cheers.

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Re: DIY F5 pure class A power amp(Nelson Pass design)

Postby brainf » Mon Oct 15, 2012 8:56 am

You know I will Loi!

This project wouldn't have been possible without your help.

Haha Doc, even if you just got the casings that will look awesome in your listening room!
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Re: DIY F5 pure class A power amp(Nelson Pass design)

Postby tony » Mon Oct 15, 2012 11:18 am

AbadSantos 7 wrote:
brainf wrote:
Cool - you have the F5 Turbo boards, start scouting for a REALLY BIG chassis for that monster! :rock:


Hi Les,

Yes this is the version 3.

For the Chassis should be no problem. I found an ACCUPHASE P Series Clone Gold Face Plate Chassis Already.

A little costly but im planning to purchase by next month.

Hi Doc Endrik....Mag F5 ka na :devil: :devil: :devil:
Mura lang pati Chassis hindi magiging problema... may kasama pang metro :devil: :devil: :devil:
Kaya lang may problema sa metro...may lente :geek: :geek: :geek:
Image
Image
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Image


cool, what happened to the innards? at least the power traffo and main filters can still be serviceable...can you post the price? thanks...
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Re: DIY F5 pure class A power amp(Nelson Pass design)

Postby brainf » Mon Oct 15, 2012 11:35 am

Hi Tony!

Loi (AbadSantos7) is a pinoy engineer based in the land of "clones". It's probably just the chassis of an Accuphase copy, judging from the pictures. (correct me if I'm wrong, Loi). :)

cheers,
leslie
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Re: DIY F5 pure class A power amp(Nelson Pass design)

Postby tony » Mon Oct 15, 2012 12:40 pm

they are quite good though.... :)
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Re: DIY F5 pure class A power amp(Nelson Pass design)

Postby AbadSantos 7 » Mon Oct 15, 2012 12:44 pm

Hi Tony,

Les is correct, All I posted is a clone chassis for Krell and Accuphase.

Measured 480X480X182 these are huge and heavy. The supplier told
me its from 15 to 20kg.

Cheers.
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Re: DIY F5 pure class A power amp(Nelson Pass design)

Postby tony » Mon Oct 15, 2012 1:05 pm

AbadSantos 7 wrote:Hi Tony,

Les is correct, All I posted is a clone chassis for Krell and Accuphase.

Measured 480X480X182 these are huge and heavy. The supplier told
me its from 15 to 20kg.

Cheers.


thanks for the info...any links or websites that we can look at?
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