[lupoal]

Hi,

with a srm-006ts I have some doubts the volume potentiometer is at its end of life... and seems no original spare parts are available since long time

I've read somewhere about use of TDK pot instead but no detailed info... it's a pitty to trought this energizer in the rubbish just because of a pot

any suggestion? any help?
thanks in advance

 

[bearFNF]

Hi,

with a srm-006ts I have some doubts the volume potentiometer is at its end of life... and seems no original spare parts are available since long time

I've read somewhere about use of TDK pot instead but no detailed info... it's a pitty to trought this energizer in the rubbish just because of a pot

any suggestion? any help?
thanks in advance

You might send Spritzer at Mjolnir-Audio.com an email and see if he has the part.

 

[oneguy]

The parts to reshell my L700 into an ES Labs Sigma L700 arrived today.



The build is pretty straight forward. No instructions were included but I managed. You will need to unsolder and re-solder the wires to get the wires in the housing.



I’d recommend to those that do this to put cardboard or tape at a minimum over the side of the driver without the screen when building this. It will offer a little piece of mind as you assemble everything.



To attach the ear pads you’ll need to cut the prongs off of the stock ear pads. I recommend using flush cut diagonal wire cutters. Cut the prongs low them gently move the leather away from the prongs and cut them flush to the plastic.




Adhesive is used to secure the pads to the housing. The kit comes with 2 or 3 pair but be warned they are difficult to get black adhesive to separate from the clear plastic adhesive protector. The Stax ones I bought yesterday were slightly better since they were paper on both sides.

Overall fit at and finish was pretty good.



The housing is 3-D printed and feels less sturdy than the Stax Sigma. Also I wish the hole to secure the cables strain reliefs to the housing was slightly smaller. I’ll have to some up with something to secure them better.

 

[KDS315]

Damping material??

 

[oneguy]

As supplied in the kit:


Looks to be some type of cloth (maybe polyester?) anda what appears to be 4 thin sheets of mineral wool.

 

[lupoal]

You might send Spritzer at Mjolnir-Audio.com an email and see if he has the part.

thank you

any DIY solution with alternative pot or dealer in european area? (in the last period custom fee became crazy expensive here in Italy)

 

[Sandro Sena]

when possible, please let us know how it sounds. Thank you.

 

[Chefguru]

The parts to reshell my L700 into an ES Labs Sigma L700 arrived today.



The build is pretty straight forward. No instructions were included but I managed. You will need to unsolder and re-solder the wires to get the wires in the housing.



I’d recommend to those that do this to put cardboard or tape at a minimum over the side of the driver without the screen when building this. It will offer a little piece of mind as you assemble everything.



To attach the ear pads you’ll need to cut the prongs off of the stock ear pads. I recommend using flush cut diagonal wire cutters. Cut the prongs low them gently move the leather away from the prongs and cut them flush to the plastic.




Adhesive is used to secure the pads to the housing. The kit comes with 2 or 3 pair but be warned they are difficult to get black adhesive to separate from the clear plastic adhesive protector. The Stax ones I bought yesterday were slightly better since they were paper on both sides.

Overall fit at and finish was pretty good.



The housing is 3-D printed and feels less sturdy than the Stax Sigma. Also I wish the hole to secure the cables strain reliefs to the housing was slightly smaller. I’ll have to some up with something to secure them better.

I assume the signature is pretty different?

 

[dynavit]

thank you

any DIY solution with alternative pot or dealer in european area? (in the last period custom fee became crazy expensive here in Italy)

Hi, you could ask Sören Schulze in Germany : https://www.inexxon.com/
He is very helpfull and has realistic prices.

 

[Sandro Sena]

The build is pretty straight forward. No instructions were included but I managed. You will need to unsolder and re-solder the wires to get the wires in the housing.

oneguy, I plan to import a Sigma housing from ES Labs soon to do exactly the same procedure, let me ask: did you re-solder the wires with the polarity reversed or did you keep it normal? it seems there is no consensus on how it should be done

 

[oneguy]

I assume the signature is pretty different?

I would categorize it as the same fingerprint but with different emphasis. I need some time to listen to them without my son watching TV in the background to do a more thoughtful evaluation. I should be able to do that today. Also, after talking with Benson last night apparently where I thought the yellow foam pieces go isn’t actually where they are intended to go. I will open the housing up today and reposition them. They are meant for sound signature tuning so what I heard last night isn’t likely what was intended.

oneguy, I plan to import a Sigma housing from ES Labs soon to do exactly the same procedure, let me ask: did you re-solder the wires with the polarity reversed or did you keep it normal? it seems there is no consensus on how it should be done

I kept them in the original polarity. Not that it would have changed my decision on the soldering but I didn’t realize the driver was meant to face the opposite direction (metal screen away from cavity interior) until after I soldered it.

 

[oneguy]

Sigma L700 vs Sigma Pro

-More background sounds present themselves with the the L700 version but some this can present itself as being less airy, or maybe veiled
-The Sigma Pro is more speaker like. The sound has the impression of coming from in front of you. This is likely due to the fact that your ear is actually inside the cavity with the Sigma Pro and can receive sounds from the driver directly where as with the L700 version your ear is not inside the cavity.
-L700 version has less sparkle than the Sigma Pro

Sigma L700 vs Stock L700

-More diffuse sound than the original L700
-Upper mids seem to have taken a hit, probably due to having to reflect the sound to get to ear opening
-Bass has picked up considerably. The cavity and the good seal allows bass to resonate better and pickup weight. The Sigma Pro doesn’t seal or maybe it may receive a bump as well.
-The Sigma L700 has a more encompassing sound vs the side of your head the the stock L700’s driver orientation affords

-Both Sigmas require the same level on the volume control which is significantly higher than where the stock L700 requires

 

[lupoal]

@dynavit

thank you

 

[KDS315]

@dynavit

thank you

Another source who does explicitely potentiomenet overhauls is Dominik Stritt at http://stritt-audio.de/ in Germany; he has the Pot service listed in his price list: http://stritt-audio.de/wp-content/uploads/2022/01/20220130_Preisliste_Driver.pdf (not cheap: EUR90-160 depending on type)

 

[kevin gilmore]

in all of my history i have never seen a volume pot die unless seriously abused.
what you may think is a bad pot could actually be bad plate resistors, way more common on 06t amplifiers.
the dual shaft pots are very hard to source.