Jcm 2000 Dsl 100w

[ibmorjamn]

Ok , so I am desperate right now trying to sift through mountains of info and reading is getting to me.
I just got a little trade/exchange/try out for the JMD.
Just in the door is the JCM DSL 2000 !
4 preamp tubes and I am wondering what goes where asap !
GT 12ax7R (phase inverter ?) JJ EC803s , EH 12ax7 and a marshall ecc83 ?

 

[Texasbluezman]

Think you might have a typo. Never heard of 12a7r.

You can put any of those tubes in any order that you like. Or even try different orders. It's called tube rolling. Lots of us here do it.

 

[ibmorjamn]

right GT12ax7r , I will fix it.

 

[Texasbluezman]

According to what I just read. That GT is a lower gain tube. Don't know why it's in a DSL. Previous owner must play classic rock and was trying to lower the gain some. It would be a V1 tube if I were looking to use it at all. Here's a little info: http://www.musiciansfriend.com/prea...d-series-gt-12ax7-r-preamp-tube#productDetail

But you can still put them in any order.

 

[Texasbluezman]

I have a JJ803S. It is a basically a long plated ECC83. Good to use in heads. I also have one of the EH's. I use it in V3. Supposed to be a good place for it. I just recently read where you don't have to have a balanced PI tube. So, it doesn't matter what goes there. The stock Marshall ECC83 would work.

 

[ibmorjamn]

Yeah , thanks. I will be testing I guess.

 

[Ken]

My advice is to retube the whole amp, but save the old tubes as they may be fine and you may even like some of the preamp tubes. Power amp tubes in a DSL are less critical as long as you bias them in the preferred 75-82 mA range. Get a set of EH, Ruby, etc. for the preamp, then sub your tubes one by one in each position. Since a DSL has so much gain on tap, a lower gain tube in V1 or V2 may be to your liking, OR the new tubes may seem to wake the amp up.

In the big picture, the DSL is a simple amp with a huge tonal range due to the EQ and gain structure. Tubes make a difference but that's the last place to tweak your tone, not the first.

Ken

 

[tschrama]

As said before, tube rolling is Bullshit

 

[Dmann]

As said before, tube rolling is Bullshit

It can definately get to a point of splitting hairs, however I have personally experinced some dramatic changes experimenting rolling various tubes through my amps.

 

[Micky]

As said before, tube rolling is Bullshit

How do you figure that?

 

[chuckharmonjr]

Cow tipping can land in bullshit....but tube rolling is fun and productive

 

[ibmorjamn]

My advice is to retube the whole amp, but save the old tubes as they may be fine and you may even like some of the preamp tubes. Power amp tubes in a DSL are less critical as long as you bias them in the preferred 75-82 mA range. Get a set of EH, Ruby, etc. for the preamp, then sub your tubes one by one in each position. Since a DSL has so much gain on tap, a lower gain tube in V1 or V2 may be to your liking, OR the new tubes may seem to wake the amp up.

In the big picture, the DSL is a simple amp with a huge tonal range due to the EQ and gain structure. Tubes make a difference but that's the last place to tweak your tone, not the first.

Ken

Well , not going to retube . Long story but a member and myself Are doing a trial amp exchange. I received the DSl yesterday and after much research going in circles I just put them in. I got recomedation of using the GT first and that works well.

 

[Ghostman]

As said before, tube rolling is Bullshit

 

[ibmorjamn]

And the Meek Shall Inherit the Earth...........

 

[ibmorjamn]

Bullshit relative to what tschrama , it does nothing or it's not worth it or you never got good results or everything is bullshit ?
Honestly I was just trying to figure out best positions to try this amp out however thanks for your help !