KSA50 AMP（New production Live in...）

[gxcnabin]

Has stayed for one day in the laboratory,Before sleeping, and everybody shares today's achievement.
1）the 210V high pressure's noise control very outstandingly.
2)Has joined 200 ohm impedance matching in the output.
3)The ARC power circuit and the traditional CRC electric circuit's difference is as follows:
a.The CRC power source, the sound dyed are many,Noise control general，The sound characteristic, like “the monosodium glutamate” were many.
b.The ARC power circuit, the sound dyes are very few, is very straight, dynamic is very strong, that kind of feeling has no way with the writing to express. . .
Please look that the following picture, is the audio frequency output noise,Regarding this test result unusual satisfaction,Then these days started to revise PCB.
Good night!
abin

 

[Pocoyo]

Supply Capacitor

Hi Abin

Sorry for disturb you from the lab activity

if i look your KSA50 you use 4X BC 6800uf 63uf
so total caps 27.200uf per channel, is this enough ?

if i compare with First (Dupont - Dudek) & second (Pinkmouse) GB KSA 50
they used minimum capacitance is 44.000 uf per channel

http://web.archive.org/web/20080117145909/http://www.diyaudio.com/wiki/index.php?page=Building+guide

 

[gxcnabin]

Hi Abin

Sorry for disturb you from the lab activity

if i look your KSA50 you use 4X BC 6800uf 63uf
so total caps 27.200uf per channel, is this enough ?

if i compare with First (Dupont - Dudek) & second (Pinkmouse) GB KSA 50
they used minimum capacitance is 44.000 uf per channel

diyAudio.com Wiki - projects by fanatics, for fanatics

Hello! PCB has received?
The capacitor use is much large capacity, this decides by you.
You may use 15000UF*4, or is higher.
However I suggested that as far as possible do not use the ring transformer, should better use the EI transformer.
When receives the PCB board, oneself perform the experiment, please remember that the upload picture, lets me also share your achievement.

 

[gxcnabin]

PCB completes.

 

[gxcnabin]

.......................

 

[tangmonster]

gxcabin , do you have the schematic for your ksa 50 board?

I want to see changes between ksa50 circuit and yours.

Thanks

 

[gxcnabin]

gxcabin , do you have the schematic for your ksa 50 board?

I want to see changes between ksa50 circuit and yours.

Thanks

Hi! tangmonster
KSA50 has assembled?
Sorry, I have not emptied reorganize the schematic diagram.
But you may look at PCB, this electric circuit is very simple.
Remembered that gives me a better suggestion.
abin

 

[tangmonster]

Not 100% assembled yet.

still looking for heatsink that is not too expensive

 

[gxcnabin]

The signal input, outputs PCB to complete.

 

[gxcnabin]

ALPS switch PCB board.

 

[Pocoyo]

Build of Material (BOM)

Hi

can you make Build of Material (BOM) like file i attached
this thing will help us for purchase the parts

taken from (Thanks to Troystg)
http://www.diyaudio.com/forums/solid-state/31077-krell-ksa-50-pcb-802.html

 

[gxcnabin]

Hi

can you make Build of Material (BOM) like file i attached
this thing will help us for purchase the parts

taken from (Thanks to Troystg)
http://www.diyaudio.com/forums/solid-state/31077-krell-ksa-50-pcb-802.html

OK, PCB board has received?

 

[Pocoyo]

Hi

I received your KSA50 PCB today
Excellent !!! Thank you Abin

Best regards, jeffry

 

[gxcnabin]

Hi

I received your KSA50 PCB today
Excellent !!! Thank you Abin

Best regards, jeffry

Real? Too good, remembers the upload picture, shares together with everybody.And please propose the valued suggestion, thanks!

 

[gxcnabin]

..........

 

[gxcnabin]

Vacuum tube Pre-amplifier PCB (12AX7 12AU7 Aaw1.1 edition), already sent to the factory to manufacture, the manufacture time approximately is 10 days.
Then, continued my wooden bugle.
http://www.diyaudio.com/forums/multi-way/166551-12-inch-wooden-horn-speaker-4.html

 

[johngalt47]

Are the KSA boards still available?

 

[gxcnabin]

Are the KSA boards still available?

Also has.

 

[Jozua]

Hi

I am keen to know if this PCB layout sounds different to the previous two (Jan Dupont and Pinkmpuse versions ?

Has anyone done a comparison?

Regards to all the Krell die-hards across the globe, we never die just gently fade away...


Jozua

 

[Pocoyo]

The Different is in the INPUT STAGE

- Jan Dupont use 2 x MPSA42 - 92, 2 x 2sa970 - 2sc2240 & 2sc3955
- Pink Mouse use 3 x MPSA 42 - 92
- Gxcnabin use 3 x 2sa970 - 2sc2240 & 2SD669

Some people build Jan and pinkmouse version and make comparable
of them, a view diy compare them with commercial version too