Citronic PPX1200 question

Vehmulski · 11th February 2011, 01:05 PM

Hi, can anyone tell me the bias setting for this amp??

burbeck · 11th February 2011, 03:48 PM

Quote:

Originally Posted by Vehmulski

Hi, can anyone tell me the bias setting for this amp??

100mA per mosfet pair

Vehmulski · 11th February 2011, 04:34 PM

Thanks Bob, I am seeing 5 pair per channel, so 500mA sounds good.

Xoc1 · 11th February 2011, 05:12 PM

100mA per pair is generally accepted as a good value for optimum sound quality, but in this case you are looking at 160V rail to rail so with 2 channels you will be dissipating 160W idling.
That is quite high for a PA amp. I'm not sure about the recomended bias for the Citronic but my c-audio mosfet amp has a quoted bias of 150mA This is probably quite enough to avoid any crossover distortion

Vehmulski · 11th February 2011, 07:15 PM

The schematic shows a total of 200v rail to rail (+100v to -100V), I've read elsewhere that these old citronic amps do run hot at idle, the cooloing fan will even cut in and out. Just got hold of this one and wanted to check that all was well before using it in anger!

11th February 2011, 01:05 PM	#1
Vehmulski diyAudio Member Join Date: Feb 2011	Citronic PPX1200 question Hi, can anyone tell me the bias setting for this amp??

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11th February 2011, 04:34 PM	#3
Vehmulski diyAudio Member Join Date: Feb 2011	Thanks Bob, I am seeing 5 pair per channel, so 500mA sounds good.

11th February 2011, 05:12 PM	#4
Xoc1 diyAudio Member Join Date: Nov 2008 Location: Devon UK	100mA per pair is generally accepted as a good value for optimum sound quality, but in this case you are looking at 160V rail to rail so with 2 channels you will be dissipating 160W idling. That is quite high for a PA amp. I'm not sure about the recomended bias for the Citronic but my c-audio mosfet amp has a quoted bias of 150mA This is probably quite enough to avoid any crossover distortion

11th February 2011, 07:15 PM	#5
Vehmulski diyAudio Member Join Date: Feb 2011	The schematic shows a total of 200v rail to rail (+100v to -100V), I've read elsewhere that these old citronic amps do run hot at idle, the cooloing fan will even cut in and out. Just got hold of this one and wanted to check that all was well before using it in anger!

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