[coinmaster]

Time to order more Duelunds LOL. No actually I'm not that patient, with the mods I'm planning to do for my amp I'll be out of money until next year already lol. Don't wana spend another $900 on another quad of duelunds.
Jensens perhaps.
Wish there was an easy way to test the sonic qualities of my industrial caps, since their "technical" specs like esr/esl/irms seem to surpass every other cap in existence that I have ever seen. Not sure what makes a "good" sounding cap.

 

[Mogos]

..........................

I was going to place these .33uf Rifa,
on other side of board, like member "coinmaster":

This is good for an MK6,
As most the wiring is in between tubes...

But take note, the blue "Output wire" is too thin(!)
As are ALL the output wires,
Leading from the board to the XLR jacks..
And so they all need upgrading...(!)

For the MK8, there was some space restrictions for placing the .33uf RIFAs on top like the pic above,
because the wiring is on the side those caps would be..


The smart move is to do this bypass cap installation at same time as replacing the super thin output wires, (from board to sockets).
That way, you only pull out the board ONCE...

My wire upgrade (from board to sockets), was done with OCC copper there(doubled,twisted& taped),
Which is extremely difficult to keep in place without hotglue..



 

Maxx what was the gauge of the thin wire. If I have undersood you correctly you have replaced it with two wires (twisted). Will it not borne any side effects - raise in wire capacitance or something else. 

 

[SonicTrance]

Ok more news,
From my listening trials,
This "new" cap to upgrade is more important in quality over size,
Which Redge78 is currently finalizing..

So we are talking about, and very similar to coupling cap quality...

What I can also say,
For those that have an MK8, the clarity increase actually allows you to easily differentiate between the power tubes..

In case no one realizes, there IS NO tube swap available for MK8 power tubes,
Except for only three made types,
In which only the DR supertube was said to be best....

I have two, the EH gold pin, and the elusive Russian "DR" Supertubes...

Now with the mod in place,
there is NO LONGER any clear superiority of the DR tubes...
Instead a more clear differentiation of their positive traits...
They are more like just a tube swap, with preference being the choice, not superiority..

So this new cap upgrade elevates the performance of the powertubes....

The MK6, having a larger tube with 8pins, does have different WCF grid resistor locations,
that may or may not need upgrading(depends if you have blue resistors)...
But the cap upgrade is the same.
You WILL hear
BOTH :
a more holographic clear performance

and a more tube characteristic performance

Edit:
Also, as mentioned in beginning,
the cap upgrade itself will also introduce its sonic trait/influence on the performance as well,
So my suggestion of sound quality over size is in order.

You can use 6SN7's as powers with a 6CG7 to 6SN7 adapter. So there are other options

 

[Maxx134]

..........................


I was going to place these .33uf Rifa,

on other side of board, like member "coinmaster":



This is good for an MK6,

As most the wiring is in between tubes...


But take note, the blue "Output wire" is too thin(!)

As are ALL the output wires,

Leading from the board to the XLR jacks..

And so they all need upgrading...(!)


For the MK8, there was some space restrictions for placing the .33uf RIFAs on top like the pic above,

because the wiring is on the side those caps would be..




The smart move is to do this bypass cap installation at same time as replacing the super thin output wires, (from board to sockets).

That way, you only pull out the board ONCE...


My wire upgrade (from board to sockets), was done with OCC copper there(doubled,twisted

Maxx what was the gauge of the thin wire. If I have undersood you correctly you have replaced it with two wires (twisted). Will it not borne any side effects - raise in wire capacitance or something else. 

The stock wire was shockingly thin..
Thinner than the wires used evrerywhere else..
They were the thinnest wire!

I recommend some good quality OCCcopper, 20-22ga min.
In the begining Ridge posts covers wire guage, althoughbit deals with the wire type that goes along side the amp, not the board wires ,
Which are short and thin..

I was quite shocked just how thin are these wire,
But the length isnshor anyways, maybe 8in...

So you need four runs of wire to come off each tube,
To the rear sockets...

I doubles my wiring because I am a bit onbessive,
And twisting them is the common procedure for running wires with least interference...

But a good single 20guage run is what would work perfect...

 

[Maxx134]

Ok more news,
From my listening trials,
This "new" cap to upgrade is more important in quality over size,
Which Redge78 is currently finalizing..

So we are talking about, and very similar to coupling cap quality...

What I can also say,
For those that have an MK8, the clarity increase actually allows you to easily differentiate between the power tubes..

In case no one realizes, there IS NO tube swap available for MK8 power tubes,
Except for only three made types,
In which only the DR supertube was said to be best....

I have two, the EH gold pin, and the elusive Russian "DR" Supertubes...

Now with the mod in place,
there is NO LONGER any clear superiority of the DR tubes...
Instead a more clear differentiation of their positive traits...
They are more like just a tube swap, with preference being the choice, not superiority..

So this new cap upgrade elevates the performance of the powertubes....

The MK6, having a larger tube with 8pins, does have different WCF grid resistor locations,
that may or may not need upgrading(depends if you have blue resistors)...
But the cap upgrade is the same.
You WILL hear
BOTH :
a more holographic clear performance

and a more tube characteristic performance

Edit:
Also, as mentioned in beginning,
the cap upgrade itself will also introduce its sonic trait/influence on the performance as well,
So my suggestion of sound quality over size is in order.

You can use 6SN7's as powers with a 6CG7 to 6SN7 adapter. So there are other options

Really?!
Are you sure?
I have the MK8 not 6.
Hmm interesting...
I will look into it..

 

[SonicTrance]

Really?!
Are you sure?
I have the MK8 not 6.
Hmm interesting...
I will look into it..

I know you have mk8, lol
I had a mkivse that also uses 6H30Pi power tubes. I used 6sn7's in my mk4 with very good results. But in the end I used 6AS7G's with external heater psu. That took the little amp to another level

 

[Maxx134]

Dam just when I was over the hill with upgrading.

 

[SonicTrance]

Haha. And there's a LOT of different sounding 6sn7's out there. You could even use the Mullard ECC32 as powers with same adapter. They draw same amount of heater current as 6h30pi, 0,9A.

 

[Redge78]

I know you have mk8, lol
I had a mkivse that also uses 6H30Pi power tubes. I used 6sn7's in my mk4 with very good results. But in the end I used 6AS7G's with external heater psu. That took the little amp to another level

 
You know you just created a monster !
 
Now you'll have to tell us everything about that !
 
How you moved from noval to octal tubes ?
How did you adjust the electrical constants, if so ? If not, why not ?
 
Welcome !

 

[SonicTrance]

You know you just created a monster !

Now you'll have to tell us everything about that !

How you moved from noval to octal tubes ?
How did you adjust the electrical constants, if so ? If not, why not ?

Welcome !

No electrical adjustments. Just a simple pin adapter and the tubes are plug n play. Before a did anything though, I read about 600 pages of the LD tube rolling thread

 

[Redge78]

No electrical adjustments. Just a simple pin adapter and the tubes are plug n play. Before a did anything though, I read about 600 pages of the LD tube rolling thread

How detumefying !  I have had a brief look at the datasheets and I was wondering how you managed the tenfold rise of the plate resistance ... 
 
 
 
There is not one tube in the world (that I know of) that is "plug'n'play" with the 6H30 ! Not one. Nada. Que dalle.
 
... which doesn't mean that your swap didn't work wonders. But most probably you were pushing your tubes outside their nominal specs, with an undefined impact on their life expectancy.
Which may or may not be trivial, depending on how much you paid them, I suppose.

 

[coinmaster]

Hey look! More of these!
 
 

 
That makes SIXTEEN giant capacitors 

 Now you are beginning to see why I'm rebuilding my amp from scratch with point to point construction. Even with my giant wooden box it still wasn't enough.
Take that along with the LDR control system I'm replacing my pot with and the capacitors I will be using for his "new" mod it's going to be big. Very big.
So big in fact that I decided I'm going to see if I can make MKVI+ monoblocks instead of 1 giant amp.

 

[Maxx134]

Well then Coin,
Get ready to BUY MORE!
LOL

Because...

NEW UPDATE MOD HAS BEEN POSTED!!!

Will also be refined soon..

 

[coinmaster]

Gunna get some Jupiter copper foil pio caps for that. I'd rather have Duelunds but money is an issue right now. 
The overall cost of my particular modifications are going to be about $4,000-$5000.

 

[Maxx134]

I have noticed a more noticable sonic change in tube swapping of the driver tubes...

The means that the clarity has increased due to the latest mod.

Before this new mod,
The amp was more sweeter and forgiving before the change of coupling cap,
from the Mundorf to the jupiters.

The jupiters made sound very natural and not sweet, but more neutral and deep..

As I have noted to Redge78, the sonic traits of sweetness came back when I put the Mundorf in the new WCF Coupln Cap locations...

SO the sweetness of trebles came back,
But not the forgiveness..
This tells me it was the garbage red cap holding it back..

The increase in clarity makes it much more realistic and spooky, depending on your tubes..
Changing tubes have greater influence, so time for tube re-evaluation...



The next test I will perform, will be swapping out my Mundorf caps with a different type to verify further the sonic infuences, specifically in treble area...