my luxman l-450 keeps blowing fuses

maciek · 1st July 2010, 03:09 AM

Any idea for solution and fix?

bob91343 · 1st July 2010, 04:44 AM

Get a service manual and check the power transistors.

moray james · 1st July 2010, 06:37 AM

I think that the 450 and the 480 are pretty much the same amp. Dual dif jfet front end cascoded second stage bipolar output. If you change the bias and put in a mosfet output you will have a stunningly fine amp a real keeper. Find the problem fix it and recap it. Enjoy it's a superb amp. If you google you should be able to find a schematic for free if not lots for sale.

maciek · 5th July 2010, 03:50 AM

Thank you for advice.

1st July 2010, 03:09 AM	#1
maciek diyAudio Member Join Date: Jul 2010	my luxman l-450 keeps blowing fuses Any idea for solution and fix?

1st July 2010, 06:37 AM	#3
moray james diyAudio Member Join Date: Aug 2003 Location: Calgary on the Bow	I think that the 450 and the 480 are pretty much the same amp. Dual dif jfet front end cascoded second stage bipolar output. If you change the bias and put in a mosfet output you will have a stunningly fine amp a real keeper. Find the problem fix it and recap it. Enjoy it's a superb amp. If you google you should be able to find a schematic for free if not lots for sale. __________________ moray james

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1st July 2010, 04:44 AM	#2
bob91343 diyAudio Member Join Date: Mar 2010	Get a service manual and check the power transistors.

5th July 2010, 03:50 AM	#4
maciek diyAudio Member Join Date: Jul 2010	Thank you for advice.

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