The dsl joey mod thread

[Buggs.Crosby]

when i complete this pdf you will no longer need any help....it will all be right there....and when you need more info just click........i hope to have it done soon....i almost have the pot board done and the rear board is a joke in comparison....the main board will be hard because of it's size

[93DMTX]

Buggs, that sounds like a great project to help the DSL bretheren.

Was thinking that maybe I needed to pull the rear board to get the tube board out but now after I got the chassis back out it looks like the tube board best comes out from the top with the cover/power tube socket support.

Rjohns1, you ain't kiddin'...digital cameras are the best for this kinda stuff.

[Buggs.Crosby]

dont worry if you mess up and cant figure out what goes where just ask

[MartyStrat54]

Are you going to include the 401 boards, or just the 50 and 100?

[Buggs.Crosby]

for now just the 50 and 100....i would need good pics of the boards for the 401 and 201
know anyone with one disassembled?

[93DMTX]

Alrighty, C9/12 main Bd done. Just removed C46. This is an iss10 bd.

Worst part was thinking about all those cables...doing it wsn't bad!

I like it! Tanks for the help! Actually work first time back together.

[Buggs.Crosby]

you want to be careful on those W spade connectors....they suck and break easy which is why i am going hardwired

[Buggs.Crosby]

did you do the rear jack mod while you were in there?

[93DMTX]

Originally Posted by Buggs.Crosby

you want to be careful on those W spade connectors....they suck and break easy which is why i am going hardwired

I agree on those shitty things. Once I'm sure I got it where want it I might think about hardwire too.

That sure would take the amount of work getting the bd out to a whole other level wouldn't it?

[Buggs.Crosby]

for you and your board yes.....that why i'm getting rid of my rear board all together

[93DMTX]

Originally Posted by Buggs.Crosby

did you do the rear jack mod while you were in there?

I did the output jacks ground bus wire one early on.

[Buggs.Crosby]

smart move

[93DMTX]

Has anybody thought about adding a PPIMV to a DSL?

~or~ Is that a dumbass question for some reason I don't yet fathom and was asked purely out of my -> .

[Joey Voltage]

Originally Posted by 93DMTX

Has anybody thought about adding a PPIMV to a DSL?

~or~ Is that a dumbass question for some reason I don't yet fathom and was asked purely out of my -> .

Depends on what type of music you like. The purpose of most high powered, modern high gain amps such as the DSL is to produce 99.9% of the overdrive/distortion, and tone shaping in the preamp, and then rely on the PA to amplify it with only subtle coloring.

a PPIMV will allow you to over drive the phase inverter more heavily as well (amongst other things) which will lead to a whole different set of nuances you may or may not like. To heavily generalize, If you are a heavy metal player/harder rock player, and want a more stringent overdrive, a PPIMV may not be the order of the day. however if you are a bluesier player, and like a more smeared/creamy overdrive characteristic, you might like it very much. again these descriptions are not set in stone, you can work anything to your benefit, it just takes some insight, and depends on whether or the trouble justifies the means, or whether the end result just equate to a more elaborate way of getting what you originally had......... again this is all a gross generalization.

[tweed]

Well looks like my DSL is sticking around for a bit so I placed an order with Mouser yesterday. Gonna take a stab at some mods, mostly the Fortin stuff, and see how it turns out.

I'm excited to get back in there and change things. All I have done so far is grounding the speaker jacks and swapping R12 on the input board to 100k. Installed a choke when I first got the amp so that's one less thing to do...

[93DMTX]

I'm thinking that my first shot will be with something like the attached. All attaching can be done at the removed R4/R5 links.

I'll just carefully hang the pot out with shielded cable until I decide if I want to make it permanent.

[93DMTX]

Getting ready to try the first version of a PPIMV.

Interestingly this unused location for CON12 will be the perfect place to locate the cables out to the dual pot after removing the two links R4/5.

This board sure looks to me like there was some thought about a PPIMV in its design layout.

[Buggs.Crosby]

the only schem that even shows that Conn has it marked as Conn 9....but is does not say where it should go...it also labels the links as r47 and r48 as what looks to be 680k resistors.....i have the pot and rear boars plotted but i still have to do the tube board

[Buggs.Crosby]

do me a favor....look on your pot board for C9....does it exist?....same thing for r14

[93DMTX]

Originally Posted by Buggs.Crosby

the only schem that even shows that Conn has it marked as Conn 9....but is does not say where it should go...it also labels the links as r47 and r48 as what looks to be 680k resistors.....i have the pot and rear boars plotted but i still have to do the tube board

This bd is an iss10 and it seems to sorta match my iss7 schematic.

Originally Posted by Buggs.Crosby

do me a favor....look on your pot board for C9....does it exist?....same thing for r14

My pot bd is an iss5

C9 is NOT loaded
R14 seems to be loaded but markings not clear

here's a pic of the area,

[93DMTX]

Well, its done and works the way it should.

Jury is still out on whether or not it gets a permanent home.

Cheap ass radioshack pot will get replace if it gets made permanent.

[Buggs.Crosby]

Originally Posted by 93DMTX

This bd is an iss10 and it seems to sorta match my iss7 schematic.




My pot bd is an iss5

C9 is NOT loaded
R14 seems to be loaded but markings not clear

here's a pic of the area,

i bet if you look close enough r14 is a 22u cap.....and no C9.....this is one of the few oddballs i have found when creating the loading chart.....more will follow

[Buggs.Crosby]

sorry the pics are so big....i'll resize them

[Micky]

No D3 or C12 either...

[93DMTX]

Originally Posted by Micky

No D3 or C12 either...

C12 was originally loaded. Lowering the value or removing is a mod to darken OD 1/2.

[Buggs.Crosby]

on the only pot board schems i have (issue 1 50 watt courtesy of JCM's site and issue 1 100 watt) are at odds......the 50 watt version shows D3 to be a 1n4007 while the 100 watt shows it to have the 22u 25v cap that we have in R14......there are definitely either more schems out there or this is an unmarked change that will now be marked

[93DMTX]

I've got a JCM2-61-00 iss5 schematic.

I think it came from dr tube. The link seems to be labeled wrong. Labeled 61-02 iss5 but schem is actually a 61-00 iss5.

http://www.drtube.com/schematics/mar...jcm2-61-02.pdf

[Buggs.Crosby]

how did i not have that one....i think i did but must have deleted it by accident....on that it shows D3 not fitted......but it still shows the cap in it's place......the issue 1 board shows it to be a 10k.....

[tweed]

here's a silly question. I am venturing back in to the amp soon for some mods and I remember last time, even with photos, I managed to cross a few "con" connections from the input board and the main board. Is there a document somewhere that has all of these ribbon connections listed? Sort of like a re assembly checklist for dumb asses like myself?

[93DMTX]

Originally Posted by tweed

here's a silly question. I am venturing back in to the amp soon for some mods and I remember last time, even with photos, I managed to cross a few "con" connections from the input board and the main board. Is there a document somewhere that has all of these ribbon connections listed? Sort of like a re assembly checklist for dumb asses like myself?

Man, the tube board is the worst.

First time I pulled it I wrote down each connection - source and destination - as I disconnected and took digital pics.

I only disconnect at the bd I'm removing. And of course never pull the cables.

Then I reversed back through my list to reinstall. Made it very easy to re-install. Now maybe 10 minutes to fully reinstall.