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Old 1st July 2013, 07:38 PM   #8491
THD+N is offline THD+N  United States
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Quote:
Originally Posted by fatbattery View Post
Ok I bought two. The cheapest guys are these. I have dealt with them before. He recons they are tested.


YJ KSA50 Class A Mono Amplifier Board New | eBay
I bought a pair of these boards and replaced all the silicon and capacitors. The resistors appeared to be ok for initial tests and listening. I also relocated the bias transistor since it was just sitting on top of the PCB, which is not where it needs to be. The PCB itself appears to be fairly good quality: double-sided w/ plated thru holes.

I have mine biased at 120mA across the 0.22 Ohm emitter resistors. This is a temporary setting as I make adjustments and get my fan cooling part of the project complete.

As other people have said, the KSA-50 clone is dead quiet and very revealing. I am using slightly modified Klipsch Heresy's (originals - 1977) and the sound is pretty good.
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Old 16th July 2013, 02:57 PM   #8492
Man304 is offline Man304  Thailand
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Quote:
Originally Posted by JKoch View Post
Hi henryve

I made KSA-50 Mk2 based on my own project of pcb. This is a copy of original Krell's pcb.

Janusz
Great the Project. Do you have the Equipment complete set too match?
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Old 31st July 2013, 11:53 PM   #8493
JKoch is offline JKoch  Poland
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Hi Man304

I regret but all parts and pcbs were sold last year.
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Old 1st August 2013, 01:21 AM   #8494
K-amps is offline K-amps  United States
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I have a pair of assembled KSA-50 PCB's (Pinkmouse/Troy version) somewhere... never installed in chassis... let me know if interested. All PCB components are included. I have other parts too if interested.
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Old 17th September 2013, 01:50 PM   #8495
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Hi,

Is there a design for a balance input for this Krell Ksa50? If not, how do I incldude one?

Thanks.
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Old 17th September 2013, 02:41 PM   #8496
troystg is offline troystg  United States
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Quote:
Originally Posted by pmchoong View Post
Hi,

Is there a design for a balance input for this Krell Ksa50? If not, how do I incldude one?

Thanks.
Passive transformer is the easiest way. The factory design was unbalanced IIRC.
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Thinking positive doesn't make things better, it makes you a better person.
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Old 17th September 2013, 03:23 PM   #8497
AndrewT is online now AndrewT  Scotland
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Cordell shows a balanced to unbalanced input for his amp.
Bryston also show their balanced input circuit.

Either of these discrete circuits can be added to get your Balanced input amplifier.
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Old 19th September 2013, 01:26 AM   #8498
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Hi Andrew,

You mean in his book?
http://www.amazon.co.uk/Designing-Au...692563&sr=8-17

Thanks.
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Old 19th September 2013, 01:33 AM   #8499
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[/QUOTE]troystg, I think the KSA50 does have balance input.....probably the MK2, version.
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Last edited by pmchoong; 19th September 2013 at 01:35 AM. Reason: include image
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Old 19th September 2013, 01:46 AM   #8500
Arick is offline Arick  Canada
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Look's more like the KSA-50S
Eric
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