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Linn SMPS for LM3886
Linn SMPS for LM3886
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Old 8th August 2014, 10:55 PM   #1
vicdiaz is offline vicdiaz  Puerto Rico
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Default Linn SMPS for LM3886

Hi,

I have a damaged Linn 2250 amp and I'm considering using the Linn case and SMPS power supply for a pair of LM3886 mono boards.

Any idea what's the output voltage of the Linn SMPS?
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Old 9th August 2014, 10:52 AM   #2
saheb11123 is offline saheb11123
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Go ahead and measure with a multimeter.
Is this the amp which were built with chipamps?
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Old 14th August 2014, 01:56 AM   #3
vicdiaz is offline vicdiaz  Puerto Rico
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if the TDA7293 is a chipamp, then yes. Haven't measured the power supply voltage but I think its output voltage is 40V-45V DC so it's a lot higher than the 24v DC recommended for the LM3886 boards.

May try sourcing a pair of Quad 405 clones or NAP140 clone boards which are rated for that voltage.
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Old 16th August 2014, 01:24 PM   #4
AndrewT is offline AndrewT  Scotland
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You may have to add a dummy load to the SMPS to get a useful reading of output voltage.

Try 100r to start. That will draw 10mA for each volt of output voltage. i.e. a 20V supply will push ~200mA into that 100r and will dissipate 4W. It will get hot very quickly.

Add more 100r if you want to see how much the output voltage varies with loading.
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Old 28th February 2021, 09:23 AM   #5
tiefbassuebertr is offline tiefbassuebertr  Germany
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Quote:
Originally Posted by vicdiaz View Post
if the TDA7293 is a chipamp, then yes. Haven't measured the power supply voltage but I think its output voltage is 40V-45V DC so it's a lot higher than the 24v DC recommended for the LM3886 boards.

May try sourcing a pair of Quad 405 clones or NAP140 clone boards which are rated for that voltage.
For me it would be interesting to know the audible impression by a listening test between this SMPS from Linn and a classic 50/60Hz version (300VA toroidal transformer, ultra fast rectifier and capacitors with screw terminals.
Who have made this comparable test ?

The distortion and noise waveform with fundamental notched out at Klimax 500 don't looks good - go to the attachment (second image is the same diagram with Pass Aleph 1.2) and this test
Linn Klimax 500 Solo monoblock power amplifier | Stereophile.com
It cannot be completely ruled out, that the main reason therefore Linn's SMPS approach is.
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File Type: jpg Linklifig4.jpg (11.8 KB, 139 views)
File Type: jpg 693PASFIG4.jpg (19.1 KB, 139 views)

Last edited by tiefbassuebertr; 28th February 2021 at 09:31 AM.
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Old 28th February 2021, 11:41 AM   #6
Joseph K is online now Joseph K  Hungary
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When You are publishing those distortion plots, it would be always nice to have a sense of scale..
For example, if the Pass residual is nice sinusoidal but 100/1000 times higher than it's counterpart..
That could bring some extra insight..
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Old 28th February 2021, 11:53 AM   #7
Joseph K is online now Joseph K  Hungary
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Like this.. It is always better to serve complete information
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File Type: jpg 693PASFIG6.jpg (28.9 KB, 120 views)
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