[alan_g]

bought the little jumper,have just put them on the pins and now my mullard cv4015 are singing.

thanks again to david for his instruction

 

[Pricklely Peete]

Alan that avatar is making my caterpillar restless

A double pun

Peete.

 

[Dept_of_Alchemy]

Quote:

Originally Posted by alan_g /img/forum/go_quote.gif bought the little jumper,have just put them on the pins and now my mullard cv4015 are singing. thanks again to david for his instruction

Sometimes I wonder if the jumpers are in the signal path and if using gold contact jumpers rather than the stock tin plated ones would make a difference sonically. Back in my computer modding college days we used to get these same jumpers for our motherboards and the guys used to insist on gold contact ones because the heat would oxidize the cheapie tin jumpers overtime and make the machines less stable.

- DoA

 

[Penchum]

Quote:

Originally Posted by Dept_of_Alchemy /img/forum/go_quote.gif Sometimes I wonder if the jumpers are in the signal path and if using gold contact jumpers rather than the stock tin plated ones would make a difference sonically. Back in my computer modding college days we used to get these same jumpers for our motherboards and the guys used to insist on gold contact ones because the heat would oxidize the cheapie tin jumpers overtime and make the machines less stable. - DoA

As far as I know, which isn't far, they are in the voltage line only. Weird thing is, I don't remember why I thought that? I've heard of the oxidation theory before, but that was a long time ago, like Intel 8088-2 days or earlier.

 

[Namrac]

Received my MKII this morning, much to my surprise, given the olympics and such, I was prepared to wait at least another few days, but it got here in a week. =D Cheers to David and Little Dot.

Initial impressions are... good not great. Bass is bloated and kinda boomy, and it seems kinda... muted. Of course, I have 45 minutes on it, so it's got some considerable burn in to do.

 

[Meliboeus]

what phones are you using it with ? i'm still waiting for my MkII...surely give feedback when i'll get it...if i recover quickly from my otitis...it's terrible i've not listened to any music for days...

 

[Namrac]

Sennheiser HD580s.

It's gotten a bit better, even in the couple hours since I first started. It feels a bit livelier, not as dark. A good change. =D

 

[Dept_of_Alchemy]

Quote:

Originally Posted by Namrac /img/forum/go_quote.gif Received my MKII this morning, much to my surprise, given the olympics and such, I was prepared to wait at least another few days, but it got here in a week. =D Cheers to David and Little Dot. Initial impressions are... good not great. Bass is bloated and kinda boomy, and it seems kinda... muted. Of course, I have 45 minutes on it, so it's got some considerable burn in to do.

The MkII comes with Chinese 6J1 as stock drivers right?

 

[Namrac]

6J6, I believe.

 

[Dept_of_Alchemy]

Quote:

Originally Posted by Namrac /img/forum/go_quote.gif 6J6, I believe.

They have Chinese characters written on them right? I would recommend replacing those with drivers like the Mullard M8100 or the Russian made 6J1P-EV, it would improve the sound greatly as the Chinese tubes in my experience are quite poorly made.

 

[alan_g]

i have to say that since i swapped over the stock tubes for mullard cv4015. This little amp becomes a different proposition altogether

 

[Meliboeus]

while waiting for my ldII i ordered some tubes to replace the original ones, i got a pair of mullard Ef95...and a pair of 6n6p power tubes, they should be ok with stock jumper settings and no modding, right ? I've not fully understood how the jumper settings affects tube compatibility..."ef95/ef92 family" are all driver tubes...so does the jumper interfere only with drivers ?

 

[Namrac]

Quote:

Originally Posted by Dept_of_Alchemy /img/forum/go_quote.gif They have Chinese characters written on them right? I would recommend replacing those with drivers like the Mullard M8100 or the Russian made 6J1P-EV, it would improve the sound greatly as the Chinese tubes in my experience are quite poorly made.

I was planning on holding off on tube rolling until I got my second MKII, but it's getting harder to resist.

 

[alan_g]

Quote:

Originally Posted by Meliboeus /img/forum/go_quote.gif while waiting for my ldII i ordered some tubes to replace the original ones, i got a pair of mullard Ef95...and a pair of 6n6p power tubes, they should be ok with stock jumper settings and no modding, right ? I've not fully understood how the jumper settings affects tube compatibility..."ef95/ef92 family" are all driver tubes...so does the jumper interfere only with drivers ?

jumpers on for the ef92 family,off for ef95

 

[Meliboeus]

ok but ef92 or 95 families are driver tubes ...what about the power ones ?what i've understand is that the kind of power valves you can fit is not affected by the jumper setting