ksa-50

MikeW · 9th March 2005, 05:26 PM

1st

MikeW · 9th March 2005, 05:27 PM

2nd

MikeW · 9th March 2005, 05:31 PM

3rd

MikeW · 9th March 2005, 05:48 PM

Jan and Troy thanks for the board. K-amps thanks for the transformer. Bias 600ma, rails 35 volts

Bill Fitzpatrick · 9th March 2005, 05:50 PM

What about it?

MikeW · 9th March 2005, 05:54 PM

Just wanted to post a few pictures with the boards from the group buy.

K-amps · 9th March 2005, 05:57 PM

Hey Mike's KSA-50's up and running! Good for ya. How's the sound? Tell us more.

Whats your emitter resistance and the voltage across each one in mV?

Bill I think Mike wanted to begin a new thread for completed KSA-50's because the KSA-50 PCB thread is kind of long now.

MikeW · 9th March 2005, 06:32 PM

The emitter resisters are .1 ohm, 30 mv across each one. I had them as high as 75mv but I could not touch the amp after about an hour. The amp sounds better than expected. Not as nice as the Aleph in the midrange, but much more punch in the low end.

Fred thanks for the heatsinks.

K-amps · 9th March 2005, 06:41 PM

75mV is 81 watts class-A with 160 watts idle dissipation.

30mV is only 13 watts pure class-A but with 60 watt dissipation.

for 50 watts pure Class-A, 59mV is needed. But as you say, we dont know if your heatsinks can take it. Also these calcs were done assuming you have 3 output pairs, I see 2 in your pics...

I am curious, how did the mids sound with the 75mV setting?

troystg · 9th March 2005, 06:57 PM

Quote:

Originally posted by MikeW
Jan and Troy thanks for the board. K-amps thanks for the transformer. Bias 600ma, rails 35 volts

Your very welcome. Thank YOU for the pictures.

So how is it setup? Source, cables and speakers? You mention midrange but what is the associated equipment? I thought I advised people NOT to use it with the Bozo AM-5 speakers. :-)

I AM JOKING.....

Thank you again for the pictures and reinvigorated enthusiasm..

9th March 2005, 05:54 PM	#6
MikeW diyAudio Member Join Date: Sep 2002 Location: North of Boston	Just wanted to post a few pictures with the boards from the group buy. __________________ MikeW

9th March 2005, 06:32 PM	#8
MikeW diyAudio Member Join Date: Sep 2002 Location: North of Boston	The emitter resisters are .1 ohm, 30 mv across each one. I had them as high as 75mv but I could not touch the amp after about an hour. The amp sounds better than expected. Not as nice as the Aleph in the midrange, but much more punch in the low end. Fred thanks for the heatsinks. __________________ MikeW

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9th March 2005, 05:50 PM	#5
Bill Fitzpatrick diyAudio Member Join Date: Jun 2001 Location: Eugene, OR	What about it?

9th March 2005, 05:57 PM	#7
K-amps diyAudio Member Join Date: Nov 2003 Location: Indiana	Hey Mike's KSA-50's up and running! Good for ya. How's the sound? Tell us more. Whats your emitter resistance and the voltage across each one in mV? Bill I think Mike wanted to begin a new thread for completed KSA-50's because the KSA-50 PCB thread is kind of long now.

9th March 2005, 06:41 PM	#9
K-amps diyAudio Member Join Date: Nov 2003 Location: Indiana	75mV is 81 watts class-A with 160 watts idle dissipation. 30mV is only 13 watts pure class-A but with 60 watt dissipation. for 50 watts pure Class-A, 59mV is needed. But as you say, we dont know if your heatsinks can take it. Also these calcs were done assuming you have 3 output pairs, I see 2 in your pics... I am curious, how did the mids sound with the 75mV setting?

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