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Old 28th May 2011, 12:40 PM   #11
Previously: Kuei Yang Wang
 
Join Date: Nov 2002
Hi,

Quote:
Originally Posted by anka58 View Post
Is on your side some experiance with Emission Labs tubes for THE Lux MonoMax? EML 300XLS or 5U4G ? I use them with in my 4 year old LD91 monos.
No experience.

Quote:
Originally Posted by anka58 View Post
I got notice that Brian had some problem with the EML on the Tram pre. Can you explain on that?
The EML's have thicker pins, in the high grade PTFE Sockets they damaged the contacts, or more precisely, it expanded them so they made poor contact with other tubes.

Ciao T
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Old 31st May 2011, 10:43 AM   #12
anka58 is offline anka58  Switzerland
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Join Date: Aug 2010
Quote:
Originally Posted by ThorstenL View Post
Hi,



No experience.



The EML's have thicker pins, in the high grade PTFE Sockets they damaged the contacts, or more precisely, it expanded them so they made poor contact with other tubes.

Ciao T

Does it mean that when i use only the EML it would work fine with the PTFE Sockets?
Anka
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Old 1st June 2011, 04:39 PM   #13
Previously: Kuei Yang Wang
 
Join Date: Nov 2002
Hi,

Quote:
Originally Posted by anka58 View Post
Does it mean that when i use only the EML it would work fine with the PTFE Sockets?
Yes. But it also means you may have to change the sockets if you ever want to use other tubes.

Ciao T
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Old 4th December 2011, 01:18 PM   #14
hkl is offline hkl  Hong Kong
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Join Date: Nov 2011
Location: Hong Kong
Hi all - I'm the proud new owner of the Lux91 monos with silk tx, and while at it I also bought the Tram2. I've had it for about a week and have been steadily burning it in with in the evenings with some light music. Comparing by contrast (my existing system was solid state - Roksan Caspian M1 integrated amp / CD player, and Roksan FR-5 floorstanding speakers), the Lux / Tram2 is more dynamic, more energetic, more musical. The soundstage is wider and the instruments clearer. Its still got a bit of burning in to do, so hopefully the sound will continue to improve.

I'm using the Roksan CD player as source and also the Roksan speakers. The speakers don't seem to be the best combination as they're not high efficiency (87db in 8 ohms), and I find that voices and instruments sound a bit distant. What speakers are other Lux91 owners using? I don't want to spend yet more $$$$ to upgrade the speakers right now, but I'm thinking the current speakers are a bit of a compromise to the Lux and Tram2.

Also, a couple of observations about the Lux.. My Lux91 is slightly different to the one in the manual as the on/off switch is now at the front. The IEC is still in the back. I don't know much about electronics or amp design, but would that mean more potential for interference? I guess there must be a reason for the change, but curious why.

Another thing, inside the Lux91 several tag boards are used, and one of those is used between the input signal path and the 310A pentode. I'm curious whether going for direct soldering instead of using the tag board would improve the sound? The tag board looks like its steel, not silver, and it looks a little off-colour - like its a bit oxidized. So I'm wondering if the signal is travelling through the tag board, albeit via short distances, would that degrade the sound quality?

In any case, I'm really enjoying my first foray into tube amps and grateful for others' knowledge on these forums. Thanks!
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Old 5th December 2011, 07:17 AM   #15
Previously: Kuei Yang Wang
 
Join Date: Nov 2002
Hi,

Quote:
Originally Posted by hkl View Post
I'm using the Roksan CD player as source and also the Roksan speakers.
You may want to try borrowing one of the Clearout Prototype dual TDA1541 Satch DAC's for a trial. You may find it will lift up the systems quite a few notches.

Quote:
Originally Posted by hkl View Post
The speakers don't seem to be the best combination as they're not high efficiency (87db in 8 ohms), and I find that voices and instruments sound a bit distant.
Try both 4 Ohm and 8 Ohm Taps.

Quote:
Originally Posted by hkl View Post
Also, a couple of observations about the Lux.. My Lux91 is slightly different to the one in the manual as the on/off switch is now at the front. The IEC is still in the back. I don't know much about electronics or amp design, but would that mean more potential for interference? I guess there must be a reason for the change, but curious why.
That is my fault, as I find rear switches a MAJOR PITA. So I had it changed.

As the wires carrying the mains run on the opposite side of the chassis and are twisted I don't think there is anything to worry...

Quote:
Originally Posted by hkl View Post
Another thing, inside the Lux91 several tag boards are used, and one of those is used between the input signal path and the 310A pentode. I'm curious whether going for direct soldering instead of using the tag board would improve the sound?
I doubt it.

Quote:
Originally Posted by hkl View Post
The tag board looks like its steel, not silver, and it looks a little off-colour - like its a bit oxidized.
The Metal is too soft for steel, I think it is a copperalloy (Brass etc), tinplated. The tagstrips are quite old and thus the tin surfaces tarnishes.

Ciao T
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Old 5th December 2011, 01:27 PM   #16
hkl is offline hkl  Hong Kong
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Join Date: Nov 2011
Location: Hong Kong
Hi Thorsten

Thanks for your reply. Sure I will check with Simon if I can try out the Satch prototype. I guess this is my advantage for living in HK! You guys are never far away.

I've been switching between the 4 ohm and 8 ohm taps. I need a bit more auditioning to determine which one is better. But I want to ask, if I use the 4 ohm tap, would that lead to a larger load on the Lux91s? And would that in turn mean the tubes will wear out quicker? Is that how it works?

Regards
HKL
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Old 6th December 2011, 07:53 AM   #17
Previously: Kuei Yang Wang
 
Join Date: Nov 2002
Hi,

Quote:
Originally Posted by hkl View Post
I've been switching between the 4 ohm and 8 ohm taps. I need a bit more auditioning to determine which one is better. But I want to ask, if I use the 4 ohm tap, would that lead to a larger load on the Lux91s?
Not in the sense in which you think it will.

What the tap does is it regulates the matching of speaker to the tube. Best think of this as being like the gearbox in a car.

The motor in the car likes to run at high revolution and (relatively) low torque, just like the tube wants high voltage but low current. The road wheels want low revolutions and high torque, just as the Speakers want low voltage and high current.

In the car the gearbox translates one to the other without much loss, in the tube amp the transformer does this. If you have the wrong gear in a car you will not get the right torque (if you want to go from stop to driving) if your gear is too high or you will not get much speed while driving even with the accelerator floored if your gear is too low.

So for every set of wheels, speed etc. there is a "right" setting for gear and the accelerator...

Similar, if the Output Tap is wrong for your speaker the results may not be as you desire. Which is right is a little hard to predict, especialy if there is minimal information. Getting the Tap that "sounds right" or "more right" usually means you also optimise the matching between Speaker and Amp/Tube.

Quote:
Originally Posted by hkl View Post
And would that in turn mean the tubes will wear out quicker? Is that how it works?
No, especially in Class A Amplifiers (SE or PP) the Tube Wear is strictly related to cathode current / dissipation and possibly the number of turn on cycles (the last not for the Lux 91 as it soft-starts both heater and HT VERY softly)...

Ciao T
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Old 6th December 2011, 07:58 AM   #18
diyAudio Member
 
Join Date: May 2003
Location: UK
Quote:
Originally Posted by hkl View Post
if I use the 4 ohm tap, would that lead to a larger load on the Lux91s? And would that in turn mean the tubes will wear out quicker? Is that how it works?
No, simply use whichever sounds better.
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Old 25th December 2011, 05:55 AM   #19
hkl is offline hkl  Hong Kong
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Join Date: Nov 2011
Location: Hong Kong
Its been a month since I first picked up the Lux91 monos. Overall I'm quite satisfied with them and yet I keep feeling they possibly have more to offer, if only they were paired to higher efficiency speakers.. I've switched around between 4 and 8 ohms and have settled with the latter. The sound seems to be more dynamic at 8 ohm, but the difference wasn't really that big. Now, I just keep wondering - what if the speakers were different.....? In particular:

1. SET magic - I've read a lot about this, and forums have told me that only high efficiency speakers will reveal this magic to me. Although the Lux sounds good, I wouldn't exactly say there's a huge wow factor when I went from solid-state to the Luxes. Am I missing out with my current 87db 2-way floorstanders?

2. Go full range? Has anyone paired their Lux91s with single drivers without crossover? Lowther? Fostex? Audio Nirvana? Could anyone share their experience with these? What would be the pros and cons compared to crossed-over x-way speakers?

3. Lowther / horn loaded speakers - these speakers confuse me.. Some say they're great (i.e. Lowther for life), and others say they have limited range and don't sound tonally accurate. I wouldn't want to go for those gigantic boxes like those vintage Lowthers, but probably more like the Fidelios, or even the Commonsense Audio 1.3s or 2.8s.. Anyone had experience with these?

4. Open baffle - i.e. Bastanis? Reviewers and users speak highly of the Bastanis paired with the Luxes. Any opinion on how they compare with hon loaded speakers, or those in a conventional box? I also read that open baffles may throw a bigger soundstage, but positioning within the soundstage is not as accurate - e.g. less able to pinpoint where the performers are. Is this true?

In summary, I guess I'm looking for speakers that take me as close to a real-life performance as possible, and for not too much $$$. I once briefly heard the US$10k+ Audio Note AN-E mated with an EL84 push-pull amp (forgot the name of that amp), and the realism of the soundstage impressed me. E.g. when the trumpet blew, it was there right in front of me, and instruments extended well beyond the speakers. Although my current Roksan floorstanders sound good tonally, the trumpet is 10m away. Is it possible to spend much less money than the AN-Es but still get that magic?

Thanks plenty
HKL
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Old 25th December 2011, 07:28 AM   #20
Previously: Kuei Yang Wang
 
Join Date: Nov 2002
Hi,

Quote:
Originally Posted by hkl View Post
1. SET magic - I've read a lot about this, and forums have told me that only high efficiency speakers will reveal this magic to me. Although the Lux sounds good, I wouldn't exactly say there's a huge wow factor when I went from solid-state to the Luxes. Am I missing out with my current 87db 2-way floorstanders?
Yes. To give you an idea, the original Lux 91 was a custom design I made for one specific reviewer who uses Speakers that are around 93dB/W/m efficient. He had tried another one of my custom Amp's (D3a choke loaded driver, 300B at 350V/60mA/5K) and found he liked the sound much better than a very expensive 300B PSE Amp, but he did not get enough power (the Amp was around 7 Watt).

So the first Lux91 was born and then people asked to buy the same Amp...

So currently you are more than 6dB of required efficiency short, probably more as the 87dB on the pro Ac's is optimistic.

Quote:
Originally Posted by hkl View Post
2. Go full range? Has anyone paired their Lux91s with single drivers without crossover? Lowther? Fostex? Audio Nirvana? Could anyone share their experience with these? What would be the pros and cons compared to crossed-over x-way speakers?

3. Lowther / horn loaded speakers - these speakers confuse me.. Some say they're great (i.e. Lowther for life), and others say they have limited range and don't sound tonally accurate. I wouldn't want to go for those gigantic boxes like those vintage Lowthers, but probably more like the Fidelios, or even the Commonsense Audio 1.3s or 2.8s.. Anyone had experience with these?
Well, DIYHiFisupply currently have a pair of nicely finished Lowther Fidelio Cabinets in clearance sale, quite cheap if local pickup.

The OEM factory for Audio Nirvana is only a bit north of Hong Kong in Dongguan and have a nice Driver that would fit the Fidelio's well and is sold on chinese E-Bay, but you would probably need a subwoofer.

Earlier Lowther drivers had grave tonal problems, current Lowthers have introduced a number of changes that correct most of these issues, but I feel they do not offer good value for money.

You could also build (or get build) my old "D3L2QD" speaker system, which the lathe Stanley Chu (the Lowther HK) and Diyhifisupply did in the late 90's, we could make an updated versions using Audio Nirvana OEM Drivers (I notice BTW that the guy behind AN has stolen this design and markets it as his own...)...

Quote:
Originally Posted by hkl View Post
4. Open baffle - i.e. Bastanis? Reviewers and users speak highly of the Bastanis paired with the Luxes. Any opinion on how they compare with hon loaded speakers, or those in a conventional box? I also read that open baffles may throw a bigger soundstage, but positioning within the soundstage is not as accurate - e.g. less able to pinpoint where the performers are. Is this true?
Open baffles need space, they may not very suitable for HK sized rooms.

They have a great advantage, namely no box colourations, but they need to be pretty big and either need a lot of space behind them or absorbtion of the rearwave, or imaging is confused.

Incidentally, there is an Open baffle design using the Ciare CH250 which was also published here, DIYhifisupply has some left over CH250 in stock that will likely go fairly cheap, in case you like to try:

'JASD' (Just A simple Dipolspeaker)

Drawings are here:

Offene Schallwand (OB)

Quote:
Originally Posted by hkl View Post
In summary, I guess I'm looking for speakers that take me as close to a real-life performance as possible, and for not too much $$$. I once briefly heard the US$10k+ Audio Note AN-E mated with an EL84 push-pull amp (forgot the name of that amp), and the realism of the soundstage impressed me. E.g. when the trumpet blew, it was there right in front of me, and instruments extended well beyond the speakers. Although my current Roksan floorstanders sound good tonally, the trumpet is 10m away. Is it possible to spend much less money than the AN-Es but still get that magic?
The AN-E is available as Kit, should you like.

There are also some AN-E'ísh speaker projects from Troels Gravensen and the AN-E was one of the speakers I had in mind to partner the Lux91...

Of course, the Crescendo (Grande) Kit is my personal answer to High Efficiency Speakers and I suspect you heard those...

You can use them with certain generic off the Shelf Subs, rather than the ones that come in the "grande" kit, REL ST Series ones would be good, maybe you can get part exchange against your Pro-Ac's?

Maybe you want to see when I am next at the diyhifisupply office and we can meet up for a chat? There is quite a bit of stuff (samples, singles) on the shelfs that may give you options.

Ciao T
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