JVM Forum

All about Marshall's JVM Series
It is currently Fri Sep 03, 2010 6:05 pm

All times are UTC - 5 hours [ DST ]




Post new topic Reply to topic  [ 94 posts ]  Go to page 1, 2, 3, 4, 5 ... 7  Next
Author Message
 Post subject: Upgrade with Mercury Magnetics OT and choke (with pics)
PostPosted: Sat Sep 06, 2008 3:09 pm 
Offline
Pub Band
User avatar

Joined: Fri Nov 30, 2007 3:04 pm
Posts: 70
Location: Netherlands
I finaly did it, upgraded my JVM with a Mercury Magnetics choke, the MC-10H, and a Mercury Magnetics output tranny, the MAR-JVM100-O!
Here are the pics:

Image
There goes my warranty!!
The choke goes instead of the R106 resistor.

Image
Here you can see the difference of the two tranny's.

Image
Almost ready!

Image
The tranny didn't fit exactly, had to change the hole's!

Image
Here are the wires from the choke.

Image
Up and runnin' again!!

Good things:
The amp is smoother now, and reacts much better!
The mids are sweeeeeet!!!
The amp sounds bigger, because of the bigger and tighter lowend.
And the lowend-thump is unbelievable.
More harmonics.

Bad things:
Tranny didn't fit in the original holes.
Drilling for fitting the choke.
It's heavier now!
Warranty is gone.

_________________
Marshalls:JVM410H,JCM800 2210, Ceriatone 2555 (Marshall Silver Jubilee Clone).
4xJCM800 A and B cabs, each with G12T-75 and V30's in X-patern.
FX:Roland GP100, Roland FC200, Boss GX700.
Guitars:Gibson Les Paul Classic, Fender Strat hardtail 1979.


Top
 Profile  
 
 Post subject:
PostPosted: Sat Sep 06, 2008 5:40 pm 
Offline
Private Parties
User avatar

Joined: Fri Mar 07, 2008 9:44 am
Posts: 192
Location: Baltimore, Md
I can deal with the "bad" 'cause it seems like the "good" outweighs the "bad" plus I love to tinker, may have to look into this.

banana_rasta

_________________
Gibson Les Paul Special-SD JB/JAZZ,ESP/LTD EC-300 SD JB/JAZZ,Peavey XXX,Marshall JVM 410H,1960b- vintage 30's,Epiphone Valve Junior with BITMO tri mod,Boss CH-1,Ibanez AD9,
Line6 DL4,BBE 462,ISP Decimator ProrackG,G-Major,MidiMate,Furman Power Factor Pro, HUM-X


Nothing in the world is more dangerous than sincere ignorance and conscientious stupidity.


Top
 Profile  
 
 Post subject:
PostPosted: Sat Sep 06, 2008 5:57 pm 
Offline
Arena
User avatar

Joined: Wed Nov 28, 2007 12:56 am
Posts: 1402
Cool, and you did it yourself. [smilie=gt-happyup.gif]
I am clueless on what is on the inside. I like what you describe as the end result though. banana_rasta

Are you planing on bypassing the heater rail fuses?

How much did the parts cost you?


Top
 Profile  
 
 Post subject:
PostPosted: Sat Sep 06, 2008 6:42 pm 
Offline
Administrator
User avatar

Joined: Tue Dec 04, 2007 2:56 pm
Posts: 1765
Location: East Coast - USA
Yes...more info! And was it worth it to you to do it?

Sound must be great cause I love mine now!
[smilie=gt-happyup.gif]

_________________
JVM410H - 1960A & B - Rocktron Tri-Wah
Pod XTL - Gibson Les Paul - Gibson SG - Charvel EVH - Minarik Inferno - Bernie Rico Jr. Vixen - Fender Strat - Rabies


Top
 Profile  
 
 Post subject:
PostPosted: Sat Sep 06, 2008 6:47 pm 
Offline
Private Parties
User avatar

Joined: Fri Mar 07, 2008 9:44 am
Posts: 192
Location: Baltimore, Md
OT is about $265, choke about $35 didn't look at the PT, probably another couple hundred so it ain't exactly cheap but probably worth it...GAS it never ends!

banana_rasta

_________________
Gibson Les Paul Special-SD JB/JAZZ,ESP/LTD EC-300 SD JB/JAZZ,Peavey XXX,Marshall JVM 410H,1960b- vintage 30's,Epiphone Valve Junior with BITMO tri mod,Boss CH-1,Ibanez AD9,
Line6 DL4,BBE 462,ISP Decimator ProrackG,G-Major,MidiMate,Furman Power Factor Pro, HUM-X


Nothing in the world is more dangerous than sincere ignorance and conscientious stupidity.


Top
 Profile  
 
 Post subject:
PostPosted: Sat Sep 06, 2008 7:02 pm 
Offline
Administrator
User avatar

Joined: Tue Dec 04, 2007 2:56 pm
Posts: 1765
Location: East Coast - USA
No doubt. It never does...lol

_________________
JVM410H - 1960A & B - Rocktron Tri-Wah
Pod XTL - Gibson Les Paul - Gibson SG - Charvel EVH - Minarik Inferno - Bernie Rico Jr. Vixen - Fender Strat - Rabies


Top
 Profile  
 
 Post subject:
PostPosted: Sat Sep 06, 2008 7:09 pm 
Offline
Arena
User avatar

Joined: Wed Nov 28, 2007 12:56 am
Posts: 1402
Hothands, if you do, I would love to hear it! [smilie=icon_wink.gif]


Top
 Profile  
 
 Post subject:
PostPosted: Sat Sep 06, 2008 8:15 pm 
Offline
Arena
User avatar

Joined: Sun Dec 02, 2007 7:39 pm
Posts: 1389
[smilie=icon_cool.gif]


Top
 Profile  
 
 Post subject:
PostPosted: Sat Sep 06, 2008 11:02 pm 
Offline
Private Parties
User avatar

Joined: Mon Dec 03, 2007 1:24 am
Posts: 105
Nice job. Pics are great ! Thanks


Top
 Profile  
 
 Post subject:
PostPosted: Sun Sep 07, 2008 9:37 am 
Offline
Private Parties
User avatar

Joined: Tue Jul 15, 2008 8:26 pm
Posts: 164
Location: Nashville
svdijk, great post here for those interested in these mods. I've got a Dual Rec that has a Mercury tranny and choke here waiting to be installed. Along with an NOS RFT and NOS Mullard on the way. I'm very interested in the Voodoo Amp mods for the JVM and it looks like you've got that covered for the most part. You're description of the results sums up what I am seeking in the amp. To combine that aggresive EL-34 tone with the increased low end you've described seems to me to be an absolutely killer combination. Possibly similar to the effect of me using my JVM in conjuction with my Dual Rec. Great job here! [smilie=gt-happyup.gif]

_________________
07'Marshall JVM 410H, 04'Gibson Custom Shop LP Standard,95'Gibson LP Standard, 93'Washburn N4 Padauk, 98'Warwick Corvette FNA, 4-4x12 Marshall cabs, X2 Digital Wireless, cases by Crown and NGM
"Let's see what lies they're trying to sell us today"-Shooter


Top
 Profile  
 
 Post subject:
PostPosted: Sun Sep 07, 2008 10:47 am 
Offline
Pub Band
User avatar

Joined: Fri Nov 30, 2007 3:04 pm
Posts: 70
Location: Netherlands
The JVM is a very service-friendly amp, so it wasn't that difficult to do the mod!
I thought of bypassing the heater fuses, but it worked oké for 1.5 years, so I leave them for now.
The output tranny was 225,- euro's and the choke 24,- euro's.
And for me it was really worth it!!!

The reasons why I did the mod, was that I was looking for more lowend in the OD1 and OD2 channels, and a thighter bass-response in the crunch-channel.
And the feedback of the amp was not very musical to my ears.
All those things are solved now for more then 100%!!
Even the OD2 channel is awesome now, and reminds me of a Mesa Mark 4, but with a thighter lowend!!

I was very used to my good old JCM800 2210 (alsow with MM ot and choke!), and missed some things in my JVM, like the nice feedback, and very big sound, but now the JVM can sound like that amp, and do a lot more then the JCM800!!

Don't get me wrong, I always liked the JVM from the beginning, just tweaking it, like I did 21 years ago, when I bought my first Marshall, the JCM800 2210, that I still own!!

_________________
Marshalls:JVM410H,JCM800 2210, Ceriatone 2555 (Marshall Silver Jubilee Clone).
4xJCM800 A and B cabs, each with G12T-75 and V30's in X-patern.
FX:Roland GP100, Roland FC200, Boss GX700.
Guitars:Gibson Les Paul Classic, Fender Strat hardtail 1979.


Top
 Profile  
 
 Post subject:
PostPosted: Sun Sep 07, 2008 2:11 pm 
Offline
Private Parties
User avatar

Joined: Fri Mar 07, 2008 9:44 am
Posts: 192
Location: Baltimore, Md
Todd Zila wrote:
Hothands, if you do, I would love to hear it! [smilie=icon_wink.gif]



Soon as I recover from my latest spending spree I'm going to do it!
Keep you posted.

banana_rasta

_________________
Gibson Les Paul Special-SD JB/JAZZ,ESP/LTD EC-300 SD JB/JAZZ,Peavey XXX,Marshall JVM 410H,1960b- vintage 30's,Epiphone Valve Junior with BITMO tri mod,Boss CH-1,Ibanez AD9,
Line6 DL4,BBE 462,ISP Decimator ProrackG,G-Major,MidiMate,Furman Power Factor Pro, HUM-X


Nothing in the world is more dangerous than sincere ignorance and conscientious stupidity.


Top
 Profile  
 
 Post subject:
PostPosted: Sun Sep 07, 2008 3:12 pm 
Offline
Club Circuit
User avatar

Joined: Tue May 20, 2008 7:49 pm
Posts: 908
Location: Tacoma WA
I might do this in say June 2010. But I'd really like to hear a modded one side by side with an unmodded one and see if you can get the unmodded one to sound close with something like an EQ or KT77s (I think that's the tube sub????) first.

_________________
Randall MTS Lynch Box (Modules: JTM (Marshally crunch); Brahma (Lynch Dokken); SL+ (Marshally); Deluxe (Fender); KH1 (Fender); Grail (Mesa DR); Mr. Scary (Soldano)); Fender HR Deville
ESP Alexi V; G&L Legacy; Fender Mustang; Gibson J45; C-1 Hellraiser; Epi LP Special (P90s); Gibson SG Std
Memberships -- League of Pentatonic Players; League of Vocal Assassins


Top
 Profile  
 
 Post subject:
PostPosted: Sun Sep 07, 2008 3:51 pm 
Offline
Administrator
User avatar

Joined: Tue Nov 27, 2007 4:59 pm
Posts: 1074
Location: Spain
RachelMorgan wrote:
I might do this in say June 2010. But I'd really like to hear a modded one side by side with an unmodded one and see if you can get the unmodded one to sound close with something like an EQ or KT77s (I think that's the tube sub????) first.


In the pix svdijk has KT77's in already ... so svdijk did you try the modded amp with Kt77's and EL34's to try both ?

I guess you did the mods at the same time but I just wondered how much difference the choke made too as that's a cheap mod to do ?

Finally are you sans c83 on this amp too ?

cheers

_________________
::: JVM410 head, DSL100W head, 1960AV w/greenbacks ,Fender Champ 12
::: Gibson Les Paul Standard BareKnuckles bridge Pickup, Tokai Strat with Dimarzio Super Distortion, Alhambra Acoustic
::: PodXTLive fully loaded, Vox V848 Clyde McCoy Wah Wah


Top
 Profile  
 
 Post subject:
PostPosted: Sun Sep 07, 2008 5:58 pm 
Offline
Private Parties
User avatar

Joined: Mon Nov 26, 2007 8:36 pm
Posts: 229
Location: Australia
Hey Svdijk, fabulous work!

Not being a technical person, I have a couple of queries.

1. It looks like the JVM has 2 transformers (1 on the left and one on the right). Is this the case?

2. In simple terms, what is a choke, and what is its purpose.


Looks like a great mod that is worth considering.

Cheers

_________________
Ibanez: 1570 Prestige, Gibson: SG ('61 Reissue & Standard), Orville: SG '61 Reissue, LP (2 Standard, Custom, Melody Maker), Schecter: Genesis, Epiphone: Les Paul Bass
Marshall: JVM 410 + 1960AV, VS100 + Quad, Musicman: RD110, Line 6: Spider Valve MkII
TC Electronic: G Major 2, Nova Drive, Boss: GT-8 + Harmonic Converger, ISP Decimator G-String, Boss NS2, Sennheiser Freeport Wireless


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 94 posts ]  Go to page 1, 2, 3, 4, 5 ... 7  Next

All times are UTC - 5 hours [ DST ]


Who is online

Users browsing this forum: HyFive578 and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group