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peranders 8th September 2002 07:29 PM

Luxman MC-amp
 
Hi!

Today I saw a Luxman MC amp model E-03(??) with rather extreme performance (some parameters). Anyone who knows something about it? I'm curious about the schematics (just my nature :) ).

Peter Daniel 8th September 2002 11:03 PM

2 Attachment(s)
I'll try to satisfy your nature.;) This schematic used to be on Luxman site, but for some reason is no longer there. The copy is poor, but it's better than nothing. As you see, nothing really revolutionary, usual Japanese stuff.;)

jcarr 9th September 2002 01:36 PM

Peranders:

The E-03 was mainly designed for cost-performance (it retailed for 120,000 yen), and was most certainly not about the ultimate performance. Interestingly, Luxman chose to build this as two completely separate equalizer circuits, one for MM, and the other for MC.

As Peter Daniels suggested, the circuit itself was an ordinary dual differential, with two dual 2SK389 JFETs for the front end of the MM equalizer, and 4 2SK389s for the MC equalizer. The second-stage differential used low-noise dual PNP BJTs (feeding a Widlar current mirror), and in general, low noise operation appears to have been a major goal. The passive EQ parts were custom-made for the product, being copper-foil polysterene caps that were inserted into copper tubing, potted and dampened. All in all, it appears that given the budget, Luxman tried to do a good job. And for the price and the vintage (1994), it was a credible performer.

The obvious problem of the E03 would be the redundant measures that Luxman implemented to get rid of DC offset - AC-coupled NFB loops in addition to AC-coupled outputs.

FWIW, Luxman had another phono stage with push-pull folded cascode circuitry that sounded considerably better, as far as I recall. The model name eludes me right now, but I do believe that it retailed for about twice the price of the E-03.

regards, jonathan carr

tvi 9th September 2002 03:27 PM

2 Attachment(s)
Couldn't find the E03, But I do have this for the E06<font size ="+1" face="symbol">a</font>

Sorry no component values :(


Regards
James

peranders 9th September 2002 04:02 PM

Thank you guys for the information.

hifidaddy 10th September 2002 06:51 PM

Luxman E03 Schematic as found in MJ12/94p.98-104
 
2 Attachment(s)
Hi,

hope that it helps ;-)

regards,
Hartmut

hifidaddy 10th September 2002 06:52 PM

power supply of said E03
 
2 Attachment(s)
regards,
Hartmut

hifidaddy 10th September 2002 06:53 PM

they used no LEDs in the E03, because they found them too noisy
 
2 Attachment(s)
regards,
Hartmut

peranders 10th September 2002 07:24 PM

Thank you very much guys.


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