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

ADA Preamps => MP-1 Classic => Topic started by: wolffer0 on November 12, 2014, 04:12:03 PM

Title: mp1 classic schematics
Post by: wolffer0 on November 12, 2014, 04:12:03 PM
My mp1 classic tubes are not heating up like they should. If I remove one the current is almost enough to make the filiments glow. My voltage is not stable and not enough to get the tubes operating. I traced the power and it originates in the power section being fed by a power transistor with a resistor between them. Then it gets power from somewhere after that. A schematic would help . The mp1 power to the filiments is unregulated 8 volt so different from my setup.
Title: Re: mp1 classic schematics
Post by: wolffer0 on November 12, 2014, 04:21:37 PM
I am hooked on the brown sound that my old jmp1 doesn't have so I need to fix this and they are not to popularge or everyone is keeping theres. $500 on ebay is to much. I ordered the tip31 transistor and the voltage regulators and some new caps for the power section so I can try and fix it in the dark
Title: Re: mp1 classic schematics
Post by: rnolan on November 13, 2014, 05:48:31 AM
Sounds like an MDRT tranny upgrade may help ? (http://www.marshalljmpmodshop.net/miscellaneous_parts_and_replacement_tubes.htm)
Plenty of schematics here if you look (http://adadepot.com/index.php?topic=148.30), also some good mods for MP1, depending what you want it to do.
Title: Re: mp1 classic schematics
Post by: MarshallJMP on November 13, 2014, 09:48:38 AM
The MDRT doesn't work in the classic.

About your classic,do you get a steady 5V?
Title: Re: mp1 classic schematics
Post by: RobbHell on February 22, 2015, 09:55:13 AM
All of the MP1 Classic schematics can be downloaded from

www.lydian.ca/ADA_MP1.html
Title: Re: mp1 classic schematics
Post by: Dante on February 23, 2015, 11:38:41 AM
So, I downloaded all the 'parts' to that multipart archive, but have so far been unsuccessful in extracting the ZIP. Grrrrrrr...

I'll keep scouring the web, it has to be out there somewhere
Title: Re: mp1 classic schematics
Post by: RobbHell on February 23, 2015, 12:08:29 PM
I feel ya bro.. I got four files to open. Main and Tube board component layouts and some notes. I couldnt get the schematic pdf to open.
Title: Re: mp1 classic schematics
Post by: Sparker on February 23, 2015, 12:20:26 PM
ADA MP1 Classic - 1. Schematics   :metal:
Title: Re: mp1 classic schematics
Post by: Sparker on February 23, 2015, 12:21:44 PM
ADA MP1 Classic - 1. Assembly & Test   :metal:
Title: Re: mp1 classic schematics
Post by: Sparker on February 23, 2015, 12:22:58 PM
ADA MP1 Classic - 1. Manual & Settings   :metal:
Title: Re: mp1 classic schematics
Post by: Sparker on February 23, 2015, 12:24:14 PM
.. and no, I can't count.   :facepalm:
Title: Re: mp1 classic schematics
Post by: Dante on February 23, 2015, 01:33:36 PM
YYYyeeeeeaahhh! Go Sparker!!

Thanks buddy, I'll get these in their proper spots in the Vault. Woot!!
Title: Re: mp1 classic schematics
Post by: RobbHell on February 23, 2015, 03:36:24 PM
Hellz Yea!
Title: Re: mp1 classic schematics
Post by: RobbHell on February 23, 2015, 04:11:16 PM
Wow what a mess of shit on that Tube Board lol. IC's  everywhere.
Title: Re: mp1 classic schematics
Post by: Dante on February 23, 2015, 06:23:52 PM
What's an IC?

Integrated Circuitboard? Iced Cucumbers? Ineligible Coupons? Ignorant Concubines? I could keep going...


UPDATE: The Vault has been updated to include all the stuff Sparker sent. Thank You SPARKER!!  :banana-trip: :banana-dance: O0 :metal: :banana-rock: :banana-guitar: :poop: :ada-big: :cheers:
Title: Re: mp1 classic schematics
Post by: Dante on February 23, 2015, 06:50:43 PM
Like I said, schematics make no sense to me...please let me know if I have too many files in there - like if I need to delete something extraneous.  :thumb-up:
Title: Re: mp1 classic schematics
Post by: RobbHell on February 23, 2015, 07:41:31 PM
lol... "Water?... like from the toilet?"