Luxman SQ38FD mkII, schematic

toprepairman · 16th March 2011, 02:24 PM

Hi.
Anyone with a schematic/circuit diagram of this amp, please?
Regards
Henry

toprepairman · 17th March 2011, 08:18 AM

Hi again.
Guess there's no copies of the schematic available.
No probs, I've got by without, but what is now needed is a replacement output transformer, anybody got one?
Also the output valves are interesting (50CA10) as they claim to be triodes, but are in fact beam tetrodes, internally reconnected as triodes.

LinuksGuru · 17th March 2011, 08:26 AM

I don't think its possible to order replacement transformer anywhere but at Luxman. These amp are very rare, and not likely to appear on eBay on sale for spares.

toprepairman · 17th March 2011, 08:51 AM

Hi Linuks.
Thanks for the reply, kinda figured that would be the case.
Would the factory still be able to supply these transformers?, hope they're not in northern Japan.......

LinuksGuru · 17th March 2011, 12:20 PM

Quote:

Originally Posted by toprepairman

Hi Linuks.
Thanks for the reply, kinda figured that would be the case.
Would the factory still be able to supply these transformers?, hope they're not in northern Japan.......

Sorry, I don't know if Luxman (which is now Alpine) can supply replacement parts for EOL products.

Once I wished to order replacement output transformers for Sansui AU-111 (made now by Hashimoto), price was 500 EURO/pc + VAT.

multi · 17th March 2011, 11:27 PM

Hi; I have a circuit; can Photo copy and send.
Very pleasant sounding amp.
Any suggestions for a replacement tubes?
Phil

Eli Duttman · 18th March 2011, 01:17 AM

Quote:

Any suggestions for a replacement tubes?

A look at the data sheet shows low R_P, low μ, and high gm. Between those characteristics and the 12 pin base, finding suitable replacements (other than the "6" V. version) looks like trouble.

toprepairman · 18th March 2011, 08:11 AM

Hi Phil.
That's brilliant, I'll send a PM.
Many thanks
Henry

LinuksGuru · 18th March 2011, 08:44 AM

I seen somewhere Shuguang made a copies of 50CA10 series tubes. There is a lot on eBay for $169/pair.

Transformer can be repaired, but if its potted (like Luxman), it is too problematic.

toprepairman · 30th March 2011, 08:05 AM

Hi Phil.
The diagrams arrived yesterday.
Many thanks for the nice clear copies, excellent!
No luck so far with finding a replacement transformer, but apparently they do come up from time to time on Japanese forums so hopefully will be able to get one before too long.
Incidentally, I do have quite a collection of circuit drawings, (many I've had to trace out myself) so if you're ever looking for something specific, do ask and I'll be only too happy to send you.
All the best
Henry

16th March 2011, 02:24 PM	#1
toprepairman diyAudio Member Join Date: Nov 2010	Luxman SQ38FD mkII, schematic Hi. Anyone with a schematic/circuit diagram of this amp, please? Regards Henry

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17th March 2011, 08:18 AM	#2
toprepairman diyAudio Member Join Date: Nov 2010	Hi again. Guess there's no copies of the schematic available. No probs, I've got by without, but what is now needed is a replacement output transformer, anybody got one? Also the output valves are interesting (50CA10) as they claim to be triodes, but are in fact beam tetrodes, internally reconnected as triodes.

17th March 2011, 08:26 AM	#3
LinuksGuru diyAudio Member Join Date: Aug 2008	I don't think its possible to order replacement transformer anywhere but at Luxman. These amp are very rare, and not likely to appear on eBay on sale for spares.

17th March 2011, 08:51 AM	#4
toprepairman diyAudio Member Join Date: Nov 2010	Hi Linuks. Thanks for the reply, kinda figured that would be the case. Would the factory still be able to supply these transformers?, hope they're not in northern Japan.......

17th March 2011, 11:27 PM	#6
multi diyAudio Member Join Date: Jan 2011	Hi; I have a circuit; can Photo copy and send. Very pleasant sounding amp. Any suggestions for a replacement tubes? Phil

18th March 2011, 08:11 AM	#8
toprepairman diyAudio Member Join Date: Nov 2010	Hi Phil. That's brilliant, I'll send a PM. Many thanks Henry

18th March 2011, 08:44 AM	#9
LinuksGuru diyAudio Member Join Date: Aug 2008	I seen somewhere Shuguang made a copies of 50CA10 series tubes. There is a lot on eBay for $169/pair. Transformer can be repaired, but if its potted (like Luxman), it is too problematic.

30th March 2011, 08:05 AM	#10
toprepairman diyAudio Member Join Date: Nov 2010	Hi Phil. The diagrams arrived yesterday. Many thanks for the nice clear copies, excellent! No luck so far with finding a replacement transformer, but apparently they do come up from time to time on Japanese forums so hopefully will be able to get one before too long. Incidentally, I do have quite a collection of circuit drawings, (many I've had to trace out myself) so if you're ever looking for something specific, do ask and I'll be only too happy to send you. All the best Henry

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