Krell Clone on 60V rails

dshortt9 · 13th September 2006, 03:32 AM

I have the Delta Audio KSA 50 boards and wish to run them on ~58V rails. I have PLENTY of heatsinking. What parts should I change to what values? Will take all suggestions with caution. Willing to use a bit less bias. Should I use the I/V limit circuit or eliminate it?

TomWaits · 13th September 2006, 04:26 AM

I have always had an interested in this quest too. Waste of time? I don't know?

Has anybody used more than 6 output devices per channel in their build (3-NPN & 3-PNP) ?

Shawn.

jacco vermeulen · 13th September 2006, 07:50 AM

12, Sanken 2SA1216/2SC2922.

Search for Stuart Easson's posts on CCS on the KSA thread.

pinkmouse · 13th September 2006, 07:52 AM

Exactly what I was just about to type. I have a b@stardised Krell running in class B with 5 pairs of outputs on 55V rails, but it's still with a friend. When I get it back I'll post pics.

jacco vermeulen · 13th September 2006, 07:55 AM

Allow me to supplement Al's words by welcoming you to the f@tB@stard (Austin Powers copyright) amp club

TomWaits · 13th September 2006, 01:43 PM

Quote:

Originally posted by dshortt9
...What parts should I change to what values? Will take all suggestions with caution. Willing to use a bit less bias. Should I use the I/V limit circuit or eliminate it?

Any takers for dshortt9's questions or is there no concern?

Quote:

Originally posted by jacco vermeulen
12, Sanken 2SA1216/2SC2922.

NICE !

Quote:

Originally posted by pinkmouse
Exactly what I was just about to type. I have a b@stardised Krell running in class B with 5 pairs of outputs on 55V rails, but it's still with a friend. When I get it back I'll post pics.

Again, very NICE! No tweaks involved? Could it be fired up with +_60 VDC? It sounds like you guys did not modify anything?

Shawn.

pinkmouse · 13th September 2006, 01:53 PM

I tweaked a few resistors in the tails of the input stage, can't remember what values I used, but it's all Ohms law to keep the currents through the diodes similar to the 35-40V version.

I removed the IV limiting in my version because of space constraints, but it depends on your usage as to if you use it or not.

dshortt9 · 13th September 2006, 02:09 PM

Thanks for the info. I have plenty of matched 2sa1216/c2922 to use. F@tB@stard KSA 200 here I come. The front end ran around 7 mils I think. Could I change the 27V zeners to accomplish the same?

dshortt9 · 13th September 2006, 02:32 PM

So if I stay with the 27V zeners there will be a 33V drop across R108/R109 @7ma. 60 volt rail. That means I would need a 33/.007 or 4.7K resistor. Yes?

dshortt9 · 13th September 2006, 02:35 PM

Would R112/R116 - R113/R117 also need to be 4.7K?

13th September 2006, 03:32 AM	#1
dshortt9 diyAudio Member Join Date: Apr 2001 Location: Milwaukee, Wisconsin	Krell Clone on 60V rails I have the Delta Audio KSA 50 boards and wish to run them on ~58V rails. I have PLENTY of heatsinking. What parts should I change to what values? Will take all suggestions with caution. Willing to use a bit less bias. Should I use the I/V limit circuit or eliminate it?

13th September 2006, 04:26 AM	#2
TomWaits diyAudio Member Join Date: Aug 2005	+_60 VDC KSA 50 I have always had an interested in this quest too. Waste of time? I don't know? Has anybody used more than 6 output devices per channel in their build (3-NPN & 3-PNP) ? Shawn.

13th September 2006, 07:52 AM	#4
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	Exactly what I was just about to type. I have a b@stardised Krell running in class B with 5 pairs of outputs on 55V rails, but it's still with a friend. When I get it back I'll post pics. __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

13th September 2006, 01:53 PM	#7
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	I tweaked a few resistors in the tails of the input stage, can't remember what values I used, but it's all Ohms law to keep the currents through the diodes similar to the 35-40V version. I removed the IV limiting in my version because of space constraints, but it depends on your usage as to if you use it or not. __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

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13th September 2006, 07:50 AM	#3
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, just under Rotterdam	12, Sanken 2SA1216/2SC2922. Search for Stuart Easson's posts on CCS on the KSA thread.

13th September 2006, 07:55 AM	#5
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, just under Rotterdam	Allow me to supplement Al's words by welcoming you to the f@tB@stard (Austin Powers copyright) amp club

13th September 2006, 02:09 PM	#8
dshortt9 diyAudio Member Join Date: Apr 2001 Location: Milwaukee, Wisconsin	Thanks for the info. I have plenty of matched 2sa1216/c2922 to use. F@tB@stard KSA 200 here I come. The front end ran around 7 mils I think. Could I change the 27V zeners to accomplish the same?

13th September 2006, 02:32 PM	#9
dshortt9 diyAudio Member Join Date: Apr 2001 Location: Milwaukee, Wisconsin	So if I stay with the 27V zeners there will be a 33V drop across R108/R109 @7ma. 60 volt rail. That means I would need a 33/.007 or 4.7K resistor. Yes?

13th September 2006, 02:35 PM	#10
dshortt9 diyAudio Member Join Date: Apr 2001 Location: Milwaukee, Wisconsin	Would R112/R116 - R113/R117 also need to be 4.7K?

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