Krell KSA 100mkII Clone

[Flodstroem]

Why not, if the voltage & current ratings are right?
Quality-wise, standard industry transformers probably won't be inferior to that thing that sits in my Krell KST 100 and that annoys me with its loud hum.

Take a look at my last post, the link will tell you why I suggested a custom transformer though it could be very difficult to find a transformer like the ones used in Krell originals (all the output voltage, shielding, potted in a can, low noise etc..etc). The issue of a custom is relevant if the power supply will be similar as to the KSA 80/160/200..................otherwise you are probably right.

Regards

[AndrewT]

Hi,
is anyone else having trouble downloading the PDF in post 80?
Is my school viewer too old?

[pinkmouse]

It comes out as completely blank on my Mac with the latest Safari and pdf plugin. Is that your problem as well?

[pinkmouse]

Mark, no problem, I was only joking!

A TO3 output board should be no problem, as will be upgrading the driver board. What format should the files be so Dave can read them? Can he take Protel/Eagle files, or will he need to import Gerbers?

[gerhard]

Originally posted by AndrewT
Hi,
is anyone else having trouble downloading the PDF in post 80?

works here. Firefox 1.5.0.2, Acrobat 6.0



and no, I won't kill the KST100. Ignoring the mechanical hum, it's completely ok. Sounds good, controls the speakers oooh so tightly etc. If necessary, I'll have someone wind me a new transformer or overhaul the old. Should be no problem here in Berlin.

Buying a working Krell and killing it for parts is not cost effective and shows some hybris. Glueing pre-existing kits together is boring, as far as I'm concerned.

I'm not interested in soldering per se but more in design, simulation and learning new tricks. A few years ago, I built an amp for applications in geophysics that could spit out +- 650V, 1A, w/o bridging, no time limit, open, short and funny loads allowed. Sooner or later I'll redo it for audio with bipolars, without having to stack lots of p-channels to make them safely withstand 2 KV.

regards, Gerhard

[konst]

few years ago, I built an amp for applications in geophysics that could spit out +- 650V, 1A, w/o bridging, no time limit, open, short and funny loads allowed. Sooner or later I'll redo it for audio with bipolars, without having to stack lots of p-channels to make them safely withstand 2 KV

Now this i have to see, have you got a schematic, perhaps we can do a little sideline from the krell

[Flodstroem]

Now this i have to see, have you got a schematic, perhaps we can do a little sideline from the krell

Yeah! ±650v thats something, realy. 459.6Vrms thru 8 ohm yield a power output like 26406W. Hmmmmmm, had to change my speakers, but then it was the d... 1Amp, -we must get rid of that!

Regards

[konst]

heheh Imagine the spark into a 0ohm "Funny Load"

[AndrewT]

Hi,
could it cope with the 0r5 load that Krell say they can do?

now 650V divided by 0.5 ..... hey, that's a big number! >420kW

[Mark A. Gulbrandsen]

Also, I never understood why the drivers were on a separate board in Als version of the KSA50.

Its been covered before.

1. The JAN board had the tabs of the two drivers reversed form each other.... not a user friendly way to mount them and difficult for newbies to deal with.

2. Most also did not like the addition of current limiting..... Krell never used any.

3. 1/2 watt Vishay resistors just barely fit between the holes.

4. No bypass options.


With Al's board design you have the option to leave the driver board attached, or break it off and mount it in the main sink. what ever is your pleasure........


Al,

Dave does have Eagle but I don't know what version. He uses PADS for all his design work though so a gerber translator will be necessary.

Gerhard...

I've heard the KST-100 before. The KSA-50 is far better.

Mark