Transforming a Luxman L-510 to an L-530 - possible? - diyAudio
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Old 16th March 2011, 07:46 AM   #1
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Default Transforming a Luxman L-510 to an L-530 - possible?

Hello!

The Luxman L-510 and L-530 are two almost identical integrated amps. The 510 outputs the first 8 watts into class A, and then 100 into class AB. The 530 does 15/120.

Both models have the same chassis, and mostly the same components, except for a few differences. The 30 has a different transformer, and 2x 30,000uF caps instead of 2x15,000uF of the 510.

The service manual for the two models is shared. And it notes the differences, at least for the most part.

I wonder if it would be resonable to change whatever is different in the 510 into what the 530 has. I am concerned about the transformer however, obviously it cannot be changed. So then, I assume it won't be possible to use the 30,000uF caps. But what other value in-between could be suitable? Would 18,000 be safe? Or even 22,000?

Also, I guess the bias would have to be changed to increase the power output, but this might not be particularly safe, since the 510 has lesser cooling than the 530. But if adding a fan, maybe it could be done. I am not confident on this however, and probably won't do it.

Any thoughts? :P
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Old 16th March 2011, 09:37 AM   #2
AllenB is offline AllenB  Australia
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I assume the higher output of the 530 means higher rail voltages, and as your transformer won't have these, you should find some of these steps easier. I am also assuming you are most interested in the available class a range and not the higher maximum output.

The larger caps may be needed for supply ripple performance at the higher quiescent current. The main issue would be inrush current, after this settles the larger caps shouldn't be a concern other than larger charging current pulses. Take a look at the fuses used in each of the models. If you decide to try this, monitor the transformer temperature, but I wouldn't expect any difference. If you are concerned, use a soft start circuit.

WRT the output, the heatsink will need to be up to the task. It may be OK as is. You may be able to take the current up in steps and try it gradually.
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Old 16th March 2011, 02:04 PM   #3
ilimzn is online now ilimzn  Croatia
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Location: Zagreb
The heatsinks are different, too. Over-biasing the 510 will heavily tax the transformer, especially with increased filter caps.
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