Aronov LS9100 - any info ???

gingertube · 12th April 2011, 07:46 AM

A friend has purchased a pair of these monoblocks and has asked if he can fit KT88 in place of the existing 6550 (4 on each monoblock for 110W output)

Can anyone provide a schematic or any knowledge of if it is cathode biased / fixed biased etc.

Any info gratefully received.

Thanks,
Ian

llwhtt · 12th April 2011, 04:21 PM

I have two of the 110 Watt stereo amps (YM-100) with four 6650s and a 6AN8 per channel. These amps are based on one of the circuits in the Dynaco transformer catalog and are fixed bias. When I first got these I contacted the manufacturer here in California and asked for some info but didn't get very far. First I was told they are NOT fixed bias but I knew different. All other info I have found says their amps are cathode bias. Maybe mine are early ones as there are no serial numbers in the serial number block on the back. Anyway all you need to do is remove the bottom and check the size of the resistor on pins 1 and 8 of the output tubes. Mine are 10 Ohms which definitely means fixed bias, cathode bias would be 500 Ohms give or take. I think KT88s would be fine here. The circuit is very simple and it would be no problem to draw a schematic which I would love to see, hint, hint.

Craig

12th April 2011, 07:46 AM	#1
gingertube diyAudio Member Join Date: Oct 2004 Location: Adelaide South Oz	Aronov LS9100 - any info ??? A friend has purchased a pair of these monoblocks and has asked if he can fit KT88 in place of the existing 6550 (4 on each monoblock for 110W output) Can anyone provide a schematic or any knowledge of if it is cathode biased / fixed biased etc. Any info gratefully received. Thanks, Ian

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12th April 2011, 04:21 PM	#2
llwhtt diyAudio Member Join Date: Jun 2008	I have two of the 110 Watt stereo amps (YM-100) with four 6650s and a 6AN8 per channel. These amps are based on one of the circuits in the Dynaco transformer catalog and are fixed bias. When I first got these I contacted the manufacturer here in California and asked for some info but didn't get very far. First I was told they are NOT fixed bias but I knew different. All other info I have found says their amps are cathode bias. Maybe mine are early ones as there are no serial numbers in the serial number block on the back. Anyway all you need to do is remove the bottom and check the size of the resistor on pins 1 and 8 of the output tubes. Mine are 10 Ohms which definitely means fixed bias, cathode bias would be 500 Ohms give or take. I think KT88s would be fine here. The circuit is very simple and it would be no problem to draw a schematic which I would love to see, hint, hint. Craig

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