JTM100 build taking off! IT LIVES!

Detailed assembly steps separated into threads.

Moderator: VelvetGeorge

User avatar
C J H
Senior Member
Posts: 183
Joined: Thu Apr 14, 2005 7:43 am
Location: Sweden

JTM100 build taking off! IT LIVES!

Post by C J H » Wed Dec 05, 2012 3:32 pm

Hi,

It´s been a while since I posted here, more or less 5 years or so. Spent 4 of them in the swedish armed forces and I´m about to head home from my second tour in A-stan in a couple of days. Can´t wait!

Anyway when I left this forum last time I had plans of rebuilding my 10xxx series to "black flag specs" but they ended when I had to spend all my money replacing two blown G12h´s... Then I really haven´t played much guitar in the last 4 years, not nearly as much as I used to atleast. Thats all about to change, I´m putting my boots and beret in the basement for god! Civvy life here i come. That means some kind of college and lots of time to put into music.

So, ofcourse i revived my old plan of refurbishing my 10xxx SB build. It was built in 2005 using an alu-chassis from Georges first batch, 1203-80-ML PT and Metros 1202-132 OT. I´ve got some new boards on the way from Brian H and 8 47uF axial caps from a swedish source. I´ve had some other parts and a wire kit lying around back home since 2007 so the plan is to tidy up the build and really take my time doing it right while also going for something kinda odd.. Basically a JTM100 w a single rectifier.

I´ve been reading up on lost knowledge and just checking some other builds (bbeautiful ones!) on the forum during the past weeks. I´m catching up alright but still can´t really remeber how values adds up when wiring caps series or parallel and so on.. can´t remember which is which either. Therefore the filter/recto board is the only thing that still has some ? before I can get started. I´ve done two layouts (-- in paint, bare with me) and I would be very glad if someone could check them out as for correct values (23.5 PI ,23.5 SCREENS ,47 MAINS) and connections. I´ve chosen to wire it up the "safer" way with HV secs coming off the standby switch. Anyway, pics..

Thanks!
Jake

EDIT: Removed the faulty layout to avoid confusion.
Attachments
JTM100-2.JPG
JTM100-2.JPG (35.95 KiB) Viewed 6087 times
Last edited by C J H on Sun May 05, 2013 7:18 am, edited 4 times in total.
"blah blah, wof wof!"

User avatar
C J H
Senior Member
Posts: 183
Joined: Thu Apr 14, 2005 7:43 am
Location: Sweden

Re: JTM100 build taking off!

Post by C J H » Wed Dec 05, 2012 3:42 pm

.. God damnit.. where it says PT sec tap I mean PT common. I guess it´s time for bed.


EDIT: Yeah must a been relly tired. Not sec tap, not common it should say center tap!


Jake
Last edited by C J H on Thu Dec 06, 2012 12:52 am, edited 1 time in total.
"blah blah, wof wof!"

User avatar
neikeel
Senior Member
Posts: 7231
Joined: Tue Dec 06, 2005 8:31 am
Location: Suffolk, England

Re: JTM100 build taking off!

Post by neikeel » Wed Dec 05, 2012 4:52 pm

Bottom one is correct.

Two 47uF in parallel for approx 100uF in series with two more to give 50uF (approx) with PT centre tap to mid point of caps to evenly balance load, if period looks not important add a couple of 220k 2 watt (at least) MO fire proof resistors across them too.
Neil

User avatar
C J H
Senior Member
Posts: 183
Joined: Thu Apr 14, 2005 7:43 am
Location: Sweden

Re: JTM100 build taking off!

Post by C J H » Wed Dec 05, 2012 11:21 pm

Sweet!

Just to clarify, are these assumptions correct? Wiring series (+ >> -) gives yUf/x where y= capaciatance of the individual caps wired in series x= number of caps. As for my screensand PI, I have 2 47uF caps (y=47,x=2). They connect with one caps pos(+) end joining the others neg(-) end, this is "wired in series" right? 47/2= 23,5 uf

Parallell (+ >> +, - >> -) adds the values of the caps. So 2 47uF caps gives 94uF. Wiring two of these parallell sections in series (.. by adding the horizontal jumper between the mains filters for instance) basically means I´ve wired 2 94 uF caps in series and this gives (94/2=47uF), this is whats called series/parallell?

As I said, still trying to refresh some old knowledge :roll:
Thanks alot for your input Neil!

Jake
"blah blah, wof wof!"

User avatar
neikeel
Senior Member
Posts: 7231
Joined: Tue Dec 06, 2005 8:31 am
Location: Suffolk, England

Re: JTM100 build taking off!

Post by neikeel » Thu Dec 06, 2012 5:42 am

C J H wrote:Sweet!

Just to clarify, are these assumptions correct? Wiring series (+ >> -) gives yUf/x where y= capaciatance of the individual caps wired in series x= number of caps. As for my screensand PI, I have 2 47uF caps (y=47,x=2). They connect with one caps pos(+) end joining the others neg(-) end, this is "wired in series" right? 47/2= 23,5 uf

Parallell (+ >> +, - >> -) adds the values of the caps. So 2 47uF caps gives 94uF. Wiring two of these parallell sections in series (.. by adding the horizontal jumper between the mains filters for instance) basically means I´ve wired 2 94 uF caps in series and this gives (94/2=47uF), this is whats called series/parallell?
Yes correct.
Neil

User avatar
C J H
Senior Member
Posts: 183
Joined: Thu Apr 14, 2005 7:43 am
Location: Sweden

Re: JTM100 build taking off! (.. and some sideprojects)

Post by C J H » Mon Dec 17, 2012 7:13 pm

.
Last edited by C J H on Sat May 04, 2013 12:49 am, edited 1 time in total.
"blah blah, wof wof!"

User avatar
C J H
Senior Member
Posts: 183
Joined: Thu Apr 14, 2005 7:43 am
Location: Sweden

Re: JTM100 build taking off! (.. and some sideprojects)

Post by C J H » Tue Dec 18, 2012 9:27 am

Finished the cab today, the handles (Marshalls HW variant..) didnt fit to good so had to enlarge the holes a bit. They also differ a bit from the handles on my straight BW, I remeber those to have only 6 bolts/handle? The HW ones have eight.. anyway, no rattle but for looks/fit I will go with scumback handles if I do this on any other cabs in the future. Before I went to bed yesterday I soaked the grill with a spraybottle of water and now its REALLY tight and nice.

Image

Also picked up some parts sourced locally in sweden and my order from valvestorm today. Great stuff! Pics will follow..

Jake
"blah blah, wof wof!"

User avatar
C J H
Senior Member
Posts: 183
Joined: Thu Apr 14, 2005 7:43 am
Location: Sweden

Re: JTM100 build taking off! (.. and some sideprojects)

Post by C J H » Thu Jan 03, 2013 4:43 pm

Alright, the new boards have arrived from Brian H and look flawless as usual!

I´ve wired up the filterboard and rectifer but thats all for now, will finish my JTM45 build before I tear down the Superbass.

Image
New boards and some components

Image
The JTM45 is coming along nicely, transformers will be here next week (Board is only in to check the fit.. )


-Jake
"blah blah, wof wof!"

User avatar
axeman
Senior Member
Posts: 2464
Joined: Wed Apr 02, 2008 1:21 pm
Just the numbers in order: 7
Location: Los Angeles
Contact:

Re: JTM100 build taking off! (.. and some sideprojects)

Post by axeman » Fri Jan 04, 2013 2:30 am

Nice

julkke
Senior Member
Posts: 675
Joined: Mon Mar 19, 2012 1:07 pm
Just the numbers in order: 13492
Location: Finland

Re: JTM100 build taking off! (.. and some sideprojects)

Post by julkke » Fri Jan 04, 2013 5:28 am

:drool: :drool: :drool:

User avatar
axeman
Senior Member
Posts: 2464
Joined: Wed Apr 02, 2008 1:21 pm
Just the numbers in order: 7
Location: Los Angeles
Contact:

Re: JTM100 build taking off! (.. and some sideprojects)

Post by axeman » Fri Jan 04, 2013 4:41 pm

Were did you get the grill cloth? What style is it, hard to tell, I really like it.

User avatar
C J H
Senior Member
Posts: 183
Joined: Thu Apr 14, 2005 7:43 am
Location: Sweden

Re: JTM100 build taking off! (.. and some sideprojects)

Post by C J H » Sun Jan 06, 2013 10:54 am

Thanks, I got the grillcloth from a swedish vendor. Its regular 2tone basketweave ("salt n pepper")
http://gmf.jetshop.se/hogtalartyg-salt- ... -1145.aspx" onclick="window.open(this.href);return false;

-Jake
"blah blah, wof wof!"

User avatar
axeman
Senior Member
Posts: 2464
Joined: Wed Apr 02, 2008 1:21 pm
Just the numbers in order: 7
Location: Los Angeles
Contact:

Re: JTM100 build taking off! (.. and some sideprojects)

Post by axeman » Mon Jan 14, 2013 12:20 am

Good job keep us posted.

User avatar
C J H
Senior Member
Posts: 183
Joined: Thu Apr 14, 2005 7:43 am
Location: Sweden

Re: JTM100 build taking off! (.. and some sideprojects)

Post by C J H » Mon Apr 01, 2013 1:36 pm

Alright, finished the JTM45 last week. It can be seen in its own thread. Today i started the teardown of my 100w and its transformation into a JTM100. Ripped pretty much everything from the amp, cleaned up the chassi and moved to holes to accomodate the screws for the bigger filterboard. I then mounted the panel, started bending leads and fitting components on the board. Lastly i flatlipped my headcab, might need a new frontbaffle for it, accidentally ripped the vinyl on one side of it.. oh well, otherwise I might make a relic :whistle: ..

Image

All for now!
"blah blah, wof wof!"

User avatar
axeman
Senior Member
Posts: 2464
Joined: Wed Apr 02, 2008 1:21 pm
Just the numbers in order: 7
Location: Los Angeles
Contact:

Re: JTM100 build taking off! (.. and some sideprojects)

Post by axeman » Thu Apr 18, 2013 1:09 am

Bad Ass, lets hear it.

Post Reply