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Old 19th September 2010, 11:00 PM   #11
Rodeodave is offline Rodeodave  Austria
hates ground loops
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Location: in the alps
Whats what and which
https://addons.mozilla.org/en-US/fir...anguage-tools/ is taking care of my typing, highly recommended no brainer!
Gravity - Making the G since 13.7 billion B.C.
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Old 19th September 2010, 11:10 PM   #12
woodturner-fran is offline woodturner-fran  Ireland
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BTW, I wasn't being too much of an a**hole... I should have added a few

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Old 19th September 2010, 11:11 PM   #13
a.wayne is offline a.wayne  United States
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Originally Posted by Bksabath View Post
Ok Aleph 2 Aleph 5

Aleph 5 6o W
The room I am listening in is 22X14 fot
Polks Ls 15 are about 87 dB at one W this would give 105 dB at 64 W which is plenty loud I think but no head room.. Got to borrow the sound level meter from work and try and see what I am getting out of the Kandy I am using at present...

My tinking is 60 W may be enoug especialy considering the kind of power suply (600VA Trany) in Nelson amps.

As i said the 25 W sudgen sounded ok but could not cope, 3 more dB out of a 50 W maybe is a good start.

You will need almost a 1KW to get 105 db @ a listening distance of 9ft from that speaker......With 64 Watts you will get 93 db...

Figure on 81-82 db nominal in order to have good transients and dynamics from 64 watts .......

Last edited by a.wayne; 19th September 2010 at 11:16 PM.
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Old 20th September 2010, 03:08 PM   #14
Bksabath is offline Bksabath  United Kingdom
Join Date: Dec 2007
Tanks Wayne I was Just triing to keep thing simple so just one chanel at one meter.

Eventualy I will mesure the SPL or to keep it simple the RMS V at a confortable listening level.

As I started this post this is a briliant site but all the god information is burried under loads of dross.

I am realy chuffed to have already a pointer from (if I may) Papa Nelson...

What I dont need is pointers to spell cekers or such.

Yes I know there are loads of mistakes but as long as my math is right I dont realy care.
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Old 23rd September 2010, 03:10 PM   #15
Bksabath is offline Bksabath  United Kingdom
Join Date: Dec 2007
I have managed to take a reading of the output level to the speakers at a comfortable level +some more.

I got 8.29 V RMS listening to a decent Hi Dynamic record (Black Sabbath Vertigo VO6 847 903 VTY)

This put things a bit more in prospective and maybe I don’t really need the 100 w amp I was thinking about.

So far after few hours reading trough the Post I have found same good information from Blitz a Grollins.

As Nelson recommended the F75 is the target but first I will give a stab at

Aleph J F5 Aleph XJ the Hi powered aleph xj and BA2.

As usual I am writing on the fly but I will put a few pointers of my findings on the post, as I would like this to be a guide of what is what and which.

Pointer 1: you may think that you need something really powerful to drive your speakers in truth a well built amp 1/4 of that may be just right.
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Old 23rd September 2010, 09:22 PM   #16
Russellc is offline Russellc  United States
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Location: midwest
Whats what and which
Originally Posted by Nelson Pass View Post
Unfortunately, the only diy amplifier of mine that can do the
100 watts is the A75, which is probably better for experienced

I should fix that one of these days.

I await this task and pray one of these days is close....

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Old 24th September 2010, 01:02 AM   #17
eyoung is offline eyoung  United States
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Location: Sunny SC,USA 15 min south of Charlotte NC
grollins is not monitoring this frequency, if you have questions not answered on this board note my id, most questions can be answered by remaining participants(us). if you want the full experience, build small to get a feel for the vibe and then upscale to the Burning Amp level...Roast a few transistors

Your Guidance Councilor, E
"Lead me not into temptation...I can find it myself."
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Old 24th September 2010, 01:19 AM   #18
jupiterjune is offline jupiterjune  United States
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Originally Posted by Russellc View Post
I await this task and pray one of these days is close....

Don't rule out the A75 just because it is an old design -- it is an amazing sounding amp. It uses some of the coolest design tricks too, such as the folded cascode second stage. It uses many of the same mosfets still in use today in many of Nelson's great amps.

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Old 24th September 2010, 03:53 PM   #19
Bksabath is offline Bksabath  United Kingdom
Join Date: Dec 2007
Tanks Eyoung

Agree with you 100 %

Planning an F5 Just to wet my appetite still be nice to get a link or 2 to where the skematics and mod/ construction notes are kept hidden.

EG I read that there is a WIKI regarding the ? XJ 100XJ but can not find it

Cuould any one please drop in the Jucy links and short cuts please?

JJ maybe wire crossed some where I feell thet the A75 is going to be my targhet.

You quote Russel

I beliewe he was hinting that he would be moderateley happy if big Papa had a look at the A75 to take it up to date.

Personaly I would suggest that the "moderatley" may be taken as a joke.

Personaly as Londoners do it be good to get a revision for the A75 "thas all right in it'

Maybe we should start a new tread

314159265358979323846264.... good rasons why Papa should have a play with the A75.

As I started this is meant to be a ussefoul place for info altrought with loads of TYPO or bad spelling notting is more usefoull or used then the number abowe.
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Old 29th September 2010, 06:56 PM   #20
Bksabath is offline Bksabath  United Kingdom
Join Date: Dec 2007
Same rusults at last.

Being working a 62 hours week most of the rest looking at this site.

So far then:

F5 nice and easy loads have beeing built same realy good pictures on tread

25 W Push Pull suply + / - 24 V consumption 160 W

(vannilla version)

Article on AudioXpress May 2008

Article construction notes First Watt site

Schematics this site F5 Power Amplifier Nelson Pass Full schematic page 9 post 89
Revised schematics revised parts please drop the links here.

To follow Aleph JX Aleph JX 100 Burning amp 2 A75 eventualy
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