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Old 30th June 2006, 11:03 AM   #1
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Unhappy Help on a LUXMAN MQ 3600

Hello all,

I've a Luxman Mq3600 to modify for the 6550 tubes.

Anyone have the original and modified scheme to send me?

Thanks for your help.

Maurizio
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Old 1st July 2006, 06:48 PM   #2
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Hi There:
here is the link for the schematic:
http://f2.grp.yahoofs.com/v1/ILimRB_..._MQ3600_p1.gif

art
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Old 1st July 2006, 09:52 PM   #3
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Maurizio,

Here it is:

http://telefunken.te.funpic.de/luxman/MQ3600-02.jpg

Regards.

Alain.
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Old 2nd July 2006, 10:23 AM   #4
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Hi art,

I can't open the link you send me..This is the modified version?

Can you help me about?

thanks
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Old 2nd July 2006, 12:25 PM   #5
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Maurizio,

what I did find on:

http://www.allaudios.org/detail-7211106.html

\
AFAIK, an 8045G IS a 6550 wired as a triode (by jumpers in the base).
See: http://www.triodeel.com/images/8045.gif

Most of the "8045G" labelled tubes I've seen were US made 6550's
with jumpers added in the base.

| This may be a difficult and expensive
| change, though less expensive than finding new 8045Gs.

Wiring the socket for a 6550 or KT88 is not difficult,
nor should it be expensive.
Ned Carlson Triode Electronics Chicago,IL USA
www.triodeelectronics.com


Then connect about 100 ohm, a couple watt resistors from pins
| 3 to 4.
|
| With no output tubes installed, fire it up (preferably with a
| Variac, but *SAFETY FIRST* in any case - allow no children or
| pets in the room).
|
| Observe voltages at points marked "C1" and C2". Adjust the 30K
| ohm bias pots for maximum voltage.
|
| Power off. Observe all supply voltages and wait until they've
| fallen to a low level, maybe a coupla volts.
|
| Install your new matched quad of Svetlana or maybe JJ power tubes.
| Fire it up again and observe. Everything OK?
|
| Bias is measured at the cathode pins (pin 8). I'd run modern
| tubes at between 50 and 70 mA (500 mV and 700mV on pin 8).
| The 10K ohm pots are to balance the current in each pair.
|
| Try various bias currents and use the least that doesn't affect
| sound quality. And no more than 80mA.

Hope this will help.

Alain.
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Old 2nd July 2006, 11:43 PM   #6
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Hi Maurizio:
here is the schematic, copied from yahoo luxman group:
art
Attached Images
File Type: jpg luxman_mq3600_1.jpg (59.0 KB, 413 views)
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Old 3rd July 2006, 06:39 AM   #7
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Thanks a lot ART.

Tell me, the OY 3.6k of MQ3600 have ultralinear taps?

Cause in the original scheme with 8045 doesn't appear.

Thanks.

Maurizio
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Old 3rd July 2006, 02:55 PM   #8
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hi maurizio:

I don't know. Never owned one, should not make any difference for switching to 6550. the schematic I copied from luxman yahoo group.
may be you should consider joing the group.
art
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Old 3rd July 2006, 03:18 PM   #9
al2002 is offline al2002  India
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Quote:
Originally posted by Alain Dupont
Maurizio,

snip

AFAIK, an 8045G IS a 6550 wired as a triode (by jumpers in the base).
See: http://www.triodeel.com/images/8045.gif

snip

Alain.
The NEC 8045 was actually a TV sweep valve, internally triode connected.

6LF6 or similar valves should work well, don't know what the going price is now.
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