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?
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?
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.
May try sourcing a pair of Quad 405 clones or NAP140 clone boards which are rated for that voltage.
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.
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.
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.
Attachments
Last edited:
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..
For example, if the Pass residual is nice sinusoidal but 100/1000 times higher than it's counterpart..
That could bring some extra insight..
