ADA Depot - A Forum To Support Users of ADA Amplification Gear

Please login or register.

Login with username, password and session length
Advanced search  

News:

Need a Schematic? Check the Vault *MP-1 Classic Schematics Just Added!!

Pages: [1]   Go Down

Author Topic: Post for Philmooo re MB-1 not used for 15 years  (Read 1042 times)

0 Members and 1 Guest are viewing this topic.

rnolan

  • Administrator
  • Superhero Member
  • ******
  • Offline Offline
  • Posts: 5922

Hey Phillip, I see you've joined the depot, welcome.  I'll start a post for you in the MB-1 threads so other can chime in with any ideas.
Sounds like the battery is dead (from what you describe).  You can source the battery mod from (http://www.marshalljmpmodshop.net/miscellaneous_parts_and_replacement_tubes.htm) if you want or you can buy a holder and battery from an electronics supplier/shop.  The replacements use a CR2032 3v lithium button battery.  The bit to watch out for is that the soldering lugs on the holder line up with the MB-1 circuit board.
You could replace the tubes although they may be fine, the MB-1 factory patches are mostly SS so don't use the tubes much.  Moreover, the tubes don't get pushed for distortion in the MB-1 like they do in the guitar preamps.  Also the original tubes (if that's what is in your MB-1) lasted allot longer than new tubes as they pumped them longer in those days and achieved a better vacuum. 

You could also update the EPROM, last MB-1 was v2.05 and the MDRT replace transformer is a great upgrade, I have them in both my MB-1s, really opens the dynamics of the unit.


Philmooo wrote:Hello, I found your forum page from a youtube video I watched by Blackbridge Sound when I was trying to troubleshoot my MB-1... I fired up my bass gear for the first time in probably 15 years, at first glance it seemed promising but there was no sound produced.I realised the preamp was acting a bit off... It used to go through the tube warmup and would be ready to go. It currently displays 1.21 and then sequences through 1-?? I suspect the internal battery is dead but I don't know if there are any other things I should look at? To my knowledge the tubes have never been replaced. Do you still offer the replaceable battery tray mod? Thanks!
« Last Edit: Time Format by rnolan »
Logged
Studio Rig: Stuff; Live Rig: More Stuff; Guitars: A few

Peter H. Boer

  • Hero Member
  • *****
  • Offline Offline
  • Posts: 557
  • 2* MB-1 1*MP-1 + Jur's old Mod4Mk2
    • The Granny Attic

Indeed sounds like a dead battery.

the upgrade to V2.05 software also included some small hardware adjustments.
The tube stage is very powerful and can go from clean to grit to real distortion sounds, the parallel SS stage obviously is always clean.
The 2 stage being parallel means you can distort the ..ll out of your bass, then mix in clean from the SS to retain the punch in the fundament.  :metal: :metal:
Logged
Nothing beats MB-1s and MP-1s with MDRTs

http://www.thegrannyattic.com
http://www.Illumion.net
http://www.sote.nl

Harley Hexxe

  • Superhero Member
  • ******
  • Offline Offline
  • Posts: 1929

Indeed sounds like a dead battery.

the upgrade to V2.05 software also included some small hardware adjustments.
The tube stage is very powerful and can go from clean to grit to real distortion sounds, the parallel SS stage obviously is always clean.
The 2 stage being parallel means you can distort the ..ll out of your bass, then mix in clean from the SS to retain the punch in the fundament.  :metal: :metal:

Well that's good to know :thumb-up:
Thanks for posting that Peter
Logged
I only have two brain cells left, ...and I'm saving them for the weekend!

rnolan

  • Administrator
  • Superhero Member
  • ******
  • Offline Offline
  • Posts: 5922

Hey Peter, do you have the upgrade/spec sheet for the 2.05 EPROM upgrade ???  And/Or do you remember what the hardware adjustments are ??  :wave:
Logged
Studio Rig: Stuff; Live Rig: More Stuff; Guitars: A few

Peter H. Boer

  • Hero Member
  • *****
  • Offline Offline
  • Posts: 557
  • 2* MB-1 1*MP-1 + Jur's old Mod4Mk2
    • The Granny Attic

Hey Peter, do you have the upgrade/spec sheet for the 2.05 EPROM upgrade ???  And/Or do you remember what the hardware adjustments are ??  :wave:

I uploaded what I have to the Vault (page 4)

http://adadepot.com/index.php?topic=148.45
Logged
Nothing beats MB-1s and MP-1s with MDRTs

http://www.thegrannyattic.com
http://www.Illumion.net
http://www.sote.nl

rnolan

  • Administrator
  • Superhero Member
  • ******
  • Offline Offline
  • Posts: 5922

Cool, thanks Peter.
Logged
Studio Rig: Stuff; Live Rig: More Stuff; Guitars: A few
Pages: [1]   Go Up