The Very Best Amplifier I Have Ever Heard!!!!

[homemodder]

QUOTE=homemodder
......... it has complementary input LTPs, complementary vas LTPs and a Lmosfet outputstage, I havent seen any design close to it on this forum or any other for that matter.

........i think the elektor crescendo amps look like your description,they used sk135/sj50..........
greets

Thats the only other amp Ive seen using this topology, I built this amp back in 1986, many years before the elektor and I recall it was a year or two old already, its one of the very best amps Ive ever heard, called KW-MOS250.

 

[jacco vermeulen]

I assume you've likely never seen the K-Lang amp schematic ? (was published in the electronics mag Menno van der Veen wrote for here)

I'm not in an All-Santa mood right now, certainly not at this thread.
One decent trick to find parts, and anything else, is to google in different language settings (which i'm awfully good at, btw)
Frequently there's a real good deal here and/or there.
Like close to 200 TO3s for $1 each here : http://www.diyaudio.com/forums/swap-meet/121949-obsolete-transistors-2sk135-2sj50-3.html#post1566603 (not that i didn't already have any K135, magnatecs, or anything TOP3. )
Couple of months later i ran into a large stash of J50s for $5 each, by using the routine above, makes $6 the pair. (and nearly 100% same batch)

 

[wahab]

Thats the only other amp Ive seen using this topology, I built this amp back in 1986, many years before the elektor and I recall it was a year or two old already, its one of the very best amps Ive ever heard, called KW-MOS250.

Crescendo in its 2X140W version date from early 1984 if not 1983...

 

[mlloyd1]

personally, i'd be A LOT more interested in conversation about the design and "cloning" of this spectral amp. even without seeing the schematic, the mechanical design and construction alone would be, as mr spock used to say, "fascinating".

mlloyd1

Nice reading : Spectral Audio DMA-180 High-Current Reference Amplifier
...
You gents are heading for a world of pain.

 

[jacco vermeulen]

This is turning into the relic thread.

www.albs.de
Press : Produkte
Press : MOS 100-300

(sorry to say i built just about all of them in AB and A, all SS or Hybrid.
Anything from 20 to 200W, 50KHz to 1MHz bandwidth, including the oldy Burbely DC100 with servo.)

Last call, i'm outahere.

 

[godfrey]

There are two 33K resistors in the schematic...
[snip]
This PCB is 100% correct and extremely well designed, layed out.

There is an extra 33K resistor on the PCB. R13 has been duplicated. See pic below. The PCB is wrong.

 

[gaborbela]

Hello
That is what I wrote many times .
Also the connection of the 33K's wrong!
Greetings

 

[alex mm]

...yes , my mistake , only one resistor from b T6 to gnd will be soldered on PCB , so the right PCB can see below .
Alex .
L.E. gaborbela witch one ? and whay ?

 

[gaborbela]

Hello

That 33K you took out from the layout , that was an extra and made wrong connection.
I wrote about these many times . I you go back some post earlier you can see it.
Now it since to me is fine.
Thank you Alex!
Greetings

 

[Dougie085]

Well I don't think I feel comfortable buying the boards without them being prototyped first. Maybe if there is a second batch I'll go for that one.

 

[gaborbela]

Hello
If I understood well Nagy will get 4 board and He will test them at first..
Otherwise many people who really interested on these project will feel the same as you.
Greetings

 

[Dougie085]

Ok well if that's the case then I may be interested.

 

[Melon Head]

but look at the x & y values alongside the frequency. They do not correspond.
Please explain what the F X Y values are telling us?

They are telling us nothing except where the cursor is on the screen. You can't see the cursor because it is hidden.
The coordinates have nothing to do with the results.

I hope I have answered your question.
I can post another image so can see the cursor if you like.

 

[bigpanda]

Hi Alex,

I need the dimension of the small protection board for quote. Any progress on problem with the gerber files that I told you in the email? Tks

 

[arthur]

are BSS71 BSS74 available?
what are the replacement trs?
thanks

 

[NagysAudio]

BSS71/BSS74 can be replaced by MPSA92/MPSA42 in this schematic. You might need to change the bias 270ohm resistor (R20) with a 330ohm resistor.

 

[arthur]

Hi NagysAudio
Thanks

 

[imagios]

Well guys I observed the thread for some time and the project really seems to be nice, I might be interested in the boards as well, can someone please summarize the project as
type of amplifier, expected power, and put a parts list together? This might help to have in one reply as the complete informations, what might help as well might be a powersource design. Just to make a complete overview.
Regards,
Daniel

 

[bigpanda]

Maybe you like this bom

 

[bigpanda]

Also a pcb with the component ID also