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Little Dot MK VI / Little Dot MK VIII SE Owners Unite - Page 65

post #961 of 2360

Zenpunk's MK VI+ arrived at home.

I'm very excited to test this unit, but still waiting for my cans to arrive.

 

Beside that, what do you guys use to upgrade the internal audio path ?

Copper or silver plated copper, PTFE coated ? And which section ?

post #962 of 2360
Quote:
Originally Posted by G600 View Post
 

Zenpunk's MK VI+ arrived at home.

I'm very excited to test this unit, but still waiting for my cans to arrive.

 

Beside that, what do you guys use to upgrade the internal audio path ?

Copper or silver plated copper, PTFE coated ? And which section ?

 

I personally don't recommend touching any of the wiring unless you have some knowledge on amp circuits and how it works and know what the output stage or in-line signal path is in the VI+.

 

Correct me if I'm wrong zenpunks VI+ has a burnt resistor? Regardless of whether or not it is within tolerance of it's rated resistance I'd replace it as burnt resistors indicate overcurrent or overvoltage, poor or inadequate cooling or under rated resistor. Replace with a 2-5watt ceramic metal film resistor or a good carbon film such as Mills or Kiwame.

post #963 of 2360

Yes there is a heated resistor. I've measured it and it is still rating 328 Ohm. But I'm about to buy 5W Kiwame and replace them -all of them ?- (on recent MK VI production, there are no more of this type of blue resistor).

 

For the wiring job, I'm not an audio expert, but I think I'm rigorous enough to replace carefully one cable after another (I'm not re-cabling all the audio path, just replacing PCB-connectors connections).

Maybe I'm wrong :tongue_smile:

As some of you noticed, wire solderings are looking very poor, and LD obviously made economy on wires.

 

And as long as I'm heating my soldering iron, why not replacing coupling caps with high end neutral ones ?


Edited by G600 - 11/24/13 at 11:39pm
post #964 of 2360

Hi JD,

you might have already come across the discussion about upgrading caps earlier in this thread but here is the link just in case ;)

 

http://www.head-fi.org/t/522099/little-dot-mk-vi-little-dot-mk-viii-se-owners-unite/345#post_8782348

post #965 of 2360
Quote:
Originally Posted by zenpunk View Post
 

Hi JD,

you might have already come across the discussion about upgrading caps earlier in this thread but here is the link just in case ;)

 

http://www.head-fi.org/t/522099/little-dot-mk-vi-little-dot-mk-viii-se-owners-unite/345#post_8782348

Yes, indeed !

I'm guilty of having read the whole thread :wink_face:

post #966 of 2360
Quote:
Originally Posted by G600 View Post
 

Yes there is a heated resistor. I've measured it and it is still rating 328 Ohm. But I'm about to buy 5W Kiwame and replace them -all of them ?- (on recent MK VI production, there are no more of this type of blue resistor).

 

For the wiring job, I'm not an audio expert, but I think I'm rigorous enough to replace carefully one cable after another (I'm not re-cabling all the audio path, just replacing PCB-connectors connections).

Maybe I'm wrong :tongue_smile:

As some of you noticed, wire solderings are looking very poor, and LD obviously made economy on wires.

 

And as long as I'm heating my soldering iron, why not replacing coupling caps with high end neutral ones ?

If you can't find 328ohm resistors then you can use some in series to add it to the right value.

 

Honestly from my own experiences as I have modded and built countless of integrated tube amplifiers, replacing the filter, audio signal caps to good coupling grade caps provide the most sonic improvements to sound. Why do you think $5000 or most $15000 tube amps that are point to point based don't use fancy grade cabling/wiring but mill-spec 600/1000V rated teflon wiring? Replace the Wima's to PIO or better MKP, V-Cap's are about as good as you can get but there supreme line is worth more than the amplifier itself. I'd also change out the crappy motorised ALPS pot to a good quality balanced stepper. 


Edited by DefQon - 11/25/13 at 2:12am
post #967 of 2360

I meant the heated resistor still measures 328 Ohm, just as the other in the amp. By reading the color chart, they are 330 Ohm 5W resistor, no big deal to find those http://www.audiophonics.fr/kiwame-resistance-film-carbone-haut-gamme-330-ohms-p-6731.html

 

I'm not sure I follow you on the rest. You mean replacing coupling caps is a better idea than replacing cables ?

I'm everything but a cable fanatic, but I don't think the hair-thick chinese spec cables are decent ones. I tried to unsolder and resolder one of them, to see what's inside : you have sponge-like soldering metal and the cable is full of plastic.

 

Fot the attenuator, I have no knowledge about that. If you have something in mind, I'm listening carefully.

 

But once more I may be wrong, and it's my placebo effect ;)


Edited by G600 - 11/25/13 at 2:57am
post #968 of 2360
Replace the mkp caps with better pio coupling caps. How much are u willing to spend on upgrades/mods?
post #969 of 2360

I d'ont know precisely. I think i'll start upgrading in a few weeks, maybe step by step, starting with coupling caps (maybe Jantzen or Mundorf Silver/Oil), depending on my budget. I just saw the price of quad attenuators, and cought a wallet-ache http://www.goldpt.com/prices.html

 

On the wire side, if I change all the 330Ohm/5W resistor, there are some of them on the back of the pcb. So if I change them all, and/or change the wires, it's a better idea to do this in the same time...

 

My goal is to fulfil the potential of this amp, BUT keep the circuits neutral to stay able to catch the differences between tubes.


Edited by G600 - 11/25/13 at 6:05am
post #970 of 2360

eww I was thinking about getting one but it's really... not that great >.> now If I get one I'll always wondered what a modded LK MK vi+ should sound like :[ 

post #971 of 2360
Quote:
Originally Posted by Mshenay View Post
 

eww I was thinking about getting one but it's really... not that great >.> now If I get one I'll always wondered what a modded LK MK vi+ should sound like :[ 

No, don't change your mind !

Tweaks and upgrades are available everywhere, and not only for the best. In French we have an idiom that says "the better is the good's enemy"

This amp is nonetheless wonderful, and a deserves your attention.

 

I'm just a weird guy who wants to personnalise everything. Buy it, have your butt kicked right out of the box, and start some tube rolling.

And don't get yourself catched by SS amps, they are the easy way... :ksc75smile: 


Edited by G600 - 11/25/13 at 9:28am
post #972 of 2360

I see that the resistor color code is then orange, orange, black and black for the 330 5 watt resistors. They seem to be carbon film type. I would think that changing the signal coupling caps for the two driver tubes would make the most difference in SQ change. I would have to figure out which caps would make the best difference in SQ for my needs.  I would have to see how much work it would take just to remove the one big PCB board out of the LD to work on it. Do to the amount of work it takes I would not like to repeat that work again. Woo amps are much easier to work on can be a consideration if you like to make changes with the amps. Changing the four gang pot is not the cheapest thing to replace and I would have to hard wire the connections.  The LD VI+ is going to take more labor time to work on it but maybe you like to do that. I remember as a kid it took me a bit of three months to build a stereo receiver and I had to do some troubleshooting afterwards to get everything working correctly. After I made all the changes to the LD I would like to double check the DC offset trimmer pots to make sure that the factory calibration is right on as close to zero as possible.

 

The LD VI+ is one of the greatest value in a balanced tube amp but not the easiest to make hardware changes on it.


Edited by john57 - 11/25/13 at 9:57am
post #973 of 2360
Quote:
Originally Posted by G600 View Post
 

No, don't change your mind !

Tweaks and upgrades are available everywhere, and not only for the best. In French we have an idiom that says "the better is the good's enemy"

This amp is nonetheless wonderful, and a deserves your attention.

 

I'm just a weird guy who wants to personnalise everything. Buy it, have your butt kicked right out of the box, and start some tube rolling.

And don't get yourself catched by SS amps, they are the easy way... :ksc75smile: 

Clever French Saying... and who knows I might one day buy mine then get it modded to hell and back by some one xD 

post #974 of 2360
Quote:
Originally Posted by john57 View Post
 

 

The LD VI+ is one of the greatest value in a balanced tube amp but not the easiest to make hardware changes on it.

true for the value and for the changes.

the interior is too small.

for me the global quality is good(capacitors, resistors, etc.)but i don´t like the pot.

i tried to put one dact: too long

post #975 of 2360
Yeah I second that John these not so expensive amps do fall in compromising some aspects and I for one hate troubleshooting double sided pcb tube amps especially when the designer has chosen to skimp out on terminal blocks.
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