Krell KSA 50 PCB

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#5,861
Took me a while to find em... quicker than trying to find it on my computers drives though. I just did a search for Stuarts name in the Solid state forum.

Perhaps we can get Stuart to pop in and add anything else he might want in there that I failed to find on the search.

Thanks!

Mark

P.S. As this thread approaces 600 pages... I am constantly amazed!
 
#5,863
Thanks again Mark for your reply.
i see your point about the 27v zeners.
My transformer delivers +/- 31 Vdc (measured) but thats without any load(just 2 capacitors 10.000 uf).
i suspect that under load it will come pretty close to the zener-voltage.
To be safe i think its best if i try it first using my existing transformer before ordering a second one.
Better safe than sorry


Greetings,

Klaas
 
#5,864
Hi Mark and thanks for asking

I'd be interested if the cost isn't too high. Who will be making them? Would you please post a link to the GB?
Click to expand...

I have not yet received a price for this transformer though I designed it right now, but if you look at my post in the GB thread you will get a clue for pricing:
http://www.diyaudio.com/forums/showthread.php?s=&threadid=74125

I should receive new prices in this week

The manufacturer for the transformers will be the same as for the earlier KSA50: Avel Lindberg. I have specified the transformer to be "dead silent" at 1/2 to full power output. It will be potted in a black round steel-can and all flexible leads will come out from the transformers bottom side.

600VA for stereo 2 x 50-80W class-A or for mono 1 x 100W+

BTW, the electrolytic caps for amps in this class are very expensive. At least they will cost
as much as $ 57.00 each here in Norway if buying 8 pcs for two mono blocks. Yields a total of $ 456 net and this is only for the caps, no mountings - phu...........
(specs for caps: 105°C 47,000µF/63V EPCOs)

Do you guys think there is an interests in a GB for caps ? Either it will be Rifa PEH169 or the BHC ALS40 series (33.000µF/63WV or maybe 47.000µF/63WV, all 105°C)

Regards 😎
 
#5,866
"Damn low price" if I may say

Hi Mark
Sounds cheap to me. Are these type computer grades screw on poles caps?
Could you specify physical dimensions for these caps ? Are these new stock or.....?
How many could you supply etc....many questions you see.

My specs for a possible GB caps was for a very high quality, long lives 105°C caps. But to a price of 10 bucks.............well then Im in.

Sounds great to the trading suggestion. Would like to come back to this issue when I have ordered transformers.

You could also send me a PM/e-mail if desired.

Regards 😎
 
#5,868
Mark, Perfect caps to my project

I was thinking of the prices for the semiconductors used in Krell clones and other amps described at the forum

One of the cheapest I have found is Newark.com. When comparing prices with for example
Digi key, they are cheaper, or am I wrong ?

MPSA42/92_______$ 0.087 each if buying a minimum of 100pcs of each

MJE15032/33_____$ 0.78 each if buying .........................25 pcs of each

MJ15003/4_______$ 2.94 each if buying.......................... 25pcs of each

Just to mention some examples.
Ore, is there a cheaper supplier than this one?

Any comments to this are welcomed

Regards 😎
 
#5,869
Going once....

I have 2 Jan kits left if any one wants them.

If I don't get a reply by Wednesday I will convert them to Al kits and they will be up for grabs.

I hope to have 10 (12 if I convert the Jans) Al kits available by next weekend.

To be clear, AFTER March 14th I will have a few more kits and I will accept email requests.



EDIT:

I was looking for the Excel spread sheet BOM that I posted on the Wiki. Has it been removed? If so, does anyone have it as mine left on the PC I sent with my soon to be X.
 
#5,870
RE: 12B4 and KSA-50....

I know that some time ago Al wondered if I had paired the two together... Since I had built the 12b4 I had not done so since my KSA-50 was torn down for quite some time awaiting a decent chassis. Tonight I have finally had the time to pair them up and all I can say is Holy Cow! This is a pair made for each other! This only re-inforces just how good both pieces are and the level of detail, soundstage and depth that both these pieces are capable of. The KSA-50 does not exhibit even the slightest harshness or artifact of its own on the top end. Magnificent! This pair has to be heard to be believed!

Mark
 
#5,877
KSA kits

Emailed Klaas diectly, this is just general info for the masses.

Jan's brds were single sided and yellowish while Al's were double sided and green.

Cost is $75 + shipping.

Shipping can ether be insured and trackable via FedEx / UPS or UNinsured via snail mail postal system.

Out of country (OOC) FedEx /UPS is ~ $50, snail mail (ie postal system) is ~ $15 but is UNinsured and UNtrackable. If it gets lost in the post it is not refundable.


Side note, I will start assembling my KSA this weekend after I finish the kitting of the last parts... I am going to try the KSA-50 in the case I just bought but if they run too hot :hot: I will turn them into mono-blocks... I bought two of the 1.2K transformers for them incase I have to split the pair. :smash:
 
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