Classic repair

[Jdm5149]

Hello everyone.  New member here.  Just purchased an Ada mp1 classic in need of repair  Unit turns on and goes thru the motions but sound is pretty much not there.  Included some pics of trouble area I think and previous owner stated. If anyone has a similar unit maybe some pics of the same area would help.  Thanks!!

[Dante]

Welcome to the Depot!

Man, I hope you find somebody here in the U.S. to do that. The Classic is a beast, more complicated inside than the MP-2!

I shipped mine across the world to get it done. Let's hope you don't have to go to that extreme - it was not fun for either of us (Customs held it forever and then charged a fee to the guy the guy picking it up - not pleasant)

Best of luck, I'll be watching this thread....and again, Welcome

Dante

PS. please don't put the same post in multiple boards

[Harley Hexxe]

Hi John,

   Let's start with a few basics here.

   First, Is the sound issue present with all four voices? (It might be helpful if you could describe in a little more detail exactly what you're hearing).

   Second, This would be the first thing I would try...install a fresh pair of tubes. See if that changes anything.

   let's see if there is any difference in what you hear, and go from there..

[rnolan]

Hey John, did you intend to post some pics?  There aren't any attached to either of your posts .

Let's start with a few basics here.

  First, Is the sound issue present with all four voices? (It might (would) be helpful if you could describe in a little more detail exactly what you're hearing). +1

  Second, This would be the first thing I would try...install a fresh pair of tubes. See if that changes anything. ++1

  let's see if there is any difference in what you hear, and go from there..

[Jdm5149]

Thanks guys for responding. I tried uploading pics but site said it wasn't a correct format.  I was wondering if anyone has a pic of inside the unit.  Possibly both sides of circuit board.  I got it used as is in need of repair. One thing I noticed is playing with the effect loop switch affects the volume. Not even using the loop. Also seller said some tubes don't light up as in mine.  I have unit disassembled so I will try to post some pics over the weekend.

[Jdm5149]

P.s.  I did buy tubes. Mullard. They don't light up. I've been testing playing thru my torpedo live. I will assemble over the weekend and test again. New to the site and isn't realize people were responding. Usually I get emails when users respond.  Thanks again for your replies and I'll post again over the weekend  👍

[rnolan]

Hey John,

Usually I get emails when users respond.

You may need to configure this in your profile/preferences?  Generally if you start a topic you should get email alerts when someone posts a reply.  In posts you are viewing and want to be notified about, there's a button top right of the post RECEIVE ALERTS/RECEIVE EMAILS AND ALERTS, but this is also influenced by your profile preferences.

I found when posting a pic you have to attach them.  So click on the "Click or drag files here to attach them" and select them from the File Upload window.  When I've dragged and dropped files it hasn't worked .  What picture format (file extension) got rejected?  I've configured it to accept most common picture files (file extensions).  Mobile phone pics can have different file extensions, so I may have to add those to the allow list?  Also you may have to reduce the size or they go way off the screen.  There may be some Classic pics in the classic thread(s)?  I don't have a classic so can't help there, maybe MJMP can post a couple?

The Fx loop and cab emulation switches can be problematic (same on the MP-2).  Seems giving them a clean and multiple toggles helps (fixed it on one of MP-2s).  Dante recently had issues with the switches on his MP-2 which he managed to clean and fix (Loop Switches).  If the loop is "out" and the loop switches still have an effect on the volume, then something is wrong.

IIRC the Mulards (I use the long plates) don't light up much (like some other tubes).  Maybe it's due to the long plate construction?  They do light up a bit but it's hard to see.

[Jdm5149]

Went into settings and changed things so hopefully I did it correctly.  The photos are taken with my iPhone so I'll try to resend also over the weekend. Thanks for the help so far.  I'm gonna reassemble and perform more tests to tell u guys the exact problem with the unit. 👍

[Harley Hexxe]

It may be difficult to see tube filaments in the Classic because it only supplies about 6 volts to the tubes instead of the 12.3 volts the tubes are meant to see.

[Jdm5149]

K. Settings worked.  Receiving emails now. 👍. Reassembled and tested the voices.  Seems only voice with volume is distortion. Installed different set of tubes and I see some light in tubes.  Gonna re solder some connections around suggests problem area by prior owner.  Also the effect switch seems to be ok now. Doesn't affect the volume   K

[Jdm5149]

K. Going thru the voices the distortion is the loudest and showing most input into the torpedo live.  All the other voices have low input into the torpedo and a lot of noise and some hum. Gonna test again later with the new tubes. Also gonna try and upload some pics

[Jdm5149]

The seller did state that problem was at input area on board where u can tell there was work down.  Maybe a failed mod or something. Gonna try and post pics  might have to try on my laptop.

[Harley Hexxe]

Then this is not a tube issue. If it were, only the solid state voice would come through at normal levels, everything else would be weak or even silent.

Now this is sounding like a cap is going bad based on the hum you're describing.

[Jdm5149]

Probably so. I will try and upload pics of area that was worked on it seems. I did notice some black residual near ground wire and top cover.  Possibly they tried to fix before selling. I will definitely post pics later and maybe if someone has a working classic they could upload too.  Thanks

[Jdm5149]

k. coverted to jpg  that seems to be area that was worked on. also where some blackening around groun wire