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Old 6th March 2009, 01:19 PM   #1
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Default Luxman L58A / 2SK163-2SJ44?

I have just bought a very nice Luxman L58A still working - But , the circuit for the amplifier part showed, that Luxman for the input differential stage has used 2SK163 and 2SJ44 from NEC.

It is possible to buy the 2SK163 in Europe but impossible to find the complementary 2SJ44.

Does anyone know if there is a substitute pair of fet's available with the approx. same spec's?

Have just bought the output fet's - the original were 134/49 but the 2Sk135/2SJ50 bought takes 160V instead of the original 140V.

Any help would be appreciated.

Rgds.
Kim Hansen
Denmark
Europe

Please find some vintage Luxman amps at: www.tubeamp.hobbysider.dk and find the link to "Skysite"!
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Old 6th March 2009, 10:06 PM   #2
mlloyd1 is offline mlloyd1  United States
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a forum search for 2sj44 turned up this link:
Mystery NEC J44/K163 JFETs in a Hafler XL-280

good luck,
mlloyd1
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Old 6th March 2009, 10:47 PM   #3
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Default 2sj44

Thanks mlloyd1,

Yes - hav'nt read the thread yet - hobe to find some substitutes for the old fet's, but it seems difficult - at least in Europe.

Rgds. Kim
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Old 27th May 2010, 05:06 PM   #4
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Default Luxman L58A schematic

Quote:
Originally Posted by KJ2005 View Post
I have just bought a very nice Luxman L58A still working - But , the circuit for the amplifier part showed, that Luxman for the input differential stage has used 2SK163 and 2SJ44 from NEC.

To "Fixingthings"

Luxman L58A
Hello

I'm looking for a repair manual schematic of a L58A amplifier. I've downloaded and payed for several pdf wich supposed to be the right schematic but it was for the 55a ampli, Do you have the correct one.

Thanks
Well - I have just received a scanned copy of the Luxman L58A schematic.

I was about to open a new thread to see whether someone has a better scan or pdf?

Some Luxman L100/L58A and valve stuff on:

http://leakstereo20.skysite.dk/

Rgds Kim

Ps. if this difficult to read post me.
Attached Images
File Type: jpg l58 003b.jpg (660.8 KB, 738 views)
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Old 27th May 2010, 09:31 PM   #5
Gudmund is offline Gudmund  Iceland
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Quote:
Originally Posted by KJ2005 View Post
Well - I have just received a scanned copy of the Luxman L58A schematic.

I was about to open a new thread to see whether someone has a better scan or pdf?

Some Luxman L100/L58A and valve stuff on:

leakstereo20

Rgds Kim

Ps. if this difficult to read post me.
Would like to have a copy of your L58A file.

Kind regards
Gudmund
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Old 28th May 2010, 09:33 AM   #6
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Quote:
Originally Posted by KJ2005 View Post
find the 2SJ44.
Nearest source is Williges electronics in Bremen, at some 200 sniper clicks from the southern Danish border.

Nice power amp stage, a parallel pair of the 1S devices in the output stage would have turned it a killer in the late '70s, early '80s.
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Old 28th May 2010, 12:00 PM   #7
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Quote:
Originally Posted by jacco vermeulen View Post
Nearest source is Williges electronics in Bremen, at some 200 sniper clicks from the southern Danish border.

Nice power amp stage, a parallel pair of the 1S devices in the output stage would have turned it a killer in the late '70s, early '80s.
Thanks Jacco - I shall try to find Williges Electronics.

Yes, I have been told that the L58A design is very good, and I agree, while the sound , at least to me, is very detailed and "musical".

When I bought the L58A , I thought that the powerstage included 4 output Hitachi fet's per channel. Unfortunately there are only one pair per channel, and the lack of sufficiant ampere-power is possible to hear by use of speakers with efficiency as low as 85-86 dB/1watt.

This is the reason why I tried to find a Luxman L100 ( four output transistors per channel and approx 110W). This amplifier is not with fet's in the output stage I think. I like the sound of the old Hitachi 2SJ50/2SK135 - well, I have just received the L100 and the old amplifier need a chance to demonstrate it's reputation.

You can find the "new" L100 on:

leakstereo20

Rgds
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Old 28th May 2010, 12:16 PM   #8
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Quote:
Originally Posted by jacco vermeulen View Post
Nice power amp stage, a parallel pair of the 1S devices in the output stage would have turned it a killer in the late '70s, early '80s.
Anyone who has changed the Luxman L58A outputstage from one pair to 4 Hitachi's per channel? The internal space for the change is sufficient in L58A.

If so - anyone who has experience whether the powersupply is capable to deliver the extra ampere?
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Old 19th June 2010, 05:11 AM   #9
EUVL is offline EUVL  Europe
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Jacco,

Have you bought any 2SJ44s from Williges or first hand experience with them ?
Are they original ?

According to this forum at least, they do sell non-original, third-party parts :

kleinere Endstufe, symm aufgebaut, Elektronik-Selbstbauprojekte - HIFI-FORUM

"hab doch noch zum glück einen kleinen laden um die ecke gefunden, der die dinger auf lager hatte! sind zwar keine "original"-Sanken, die hier scheinbar gefeiert werden, aber der kleine, feine unterschied war auch, das Williges für einen EIC nicht 8-13€ plus versand und 25 € mindestbestellung haben wollte, sondern 3,30€ plus märchen."

Williges-Online-Shop

(4 Euros for a 2SC1116.)


Patrick
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Old 20th June 2010, 12:32 PM   #10
EUVL is offline EUVL  Europe
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I checked with Williges.
They don't have any in stock.

Patrick
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