New (to me) MT200 came in today

[Lyates1987]

So I recently got my hands on the MT200. It's not a bad amp at all, I was mainly in it for the 1U slot. both A and B channels seem to work fine but the Mono/Bridged channel is WAY quieter than running just the A or B channel. 200 watts at 8ohms, was definitely expecting it to be louder, not quieter. I'm gonna take a look at what's going on and report back but so far the plan is to blow out all the BS and do a reflow on the jack pcb and also give it a good dose of Deoxit. So far there doesn't seem to be any damage or blown caps/resistors etc. Haven't changed the tubes yet but thats on the list of shit to do as well. Just like any other amp, sounds great when cranked.

[rnolan]

Cool, strange it's quieter in bridge mode though  :crazy:

[Dante]

NICE!

[Harley Hexxe]

    Hey BJ,

         Sounds like you got a great deal on that one  :thumb-up:


Harley 8)

[Lyates1987]

Thanks guys! So far I'm alright using just 1 channel but would like to get the bridged channel working right, unfortunately I didn't have time to work on it this weekend and still waiting fro more deoxit to come in the mail (forgot I was out!) but I'll report what I find so I can add some input regarding the bridged channel. Seems like that channel is rather finnicky based on what I've been reading.

[MarshallJMP]

When you play in bridged mode, does everything sounds clean? I mean no distortion?

[Lyates1987]

When you play in bridged mode, does everything sounds clean? I mean no distortion?

Yes! after taking another good listen there is distortion! I tried to play harder with it turned up all the way and it almost sounds like it's trying to get way louder but can't quite do it.

[MarshallJMP]

Could be that there's something wrong with the bridge mode circuit.

[Lyates1987]

Could be that there's something wrong with the bridge mode circuit.

Sounds like a not so solid connection somewhere, still trying to hunt it down but no clear visible signs. Multimeter time.

[MarshallJMP]

Could be, in the bridged out jack is a switch that should open and in the A and B out jacks is a switch that should be closed in bridge mode.

[Lyates1987]

Could be, in the bridged out jack is a switch that should open and in the A and B out jacks is a switch that should be closed in bridge mode.

Is the switch you referring to the little silver thing sticking out at the bottom of the speaker out bridged jack?

[MarshallJMP]

It's on the inside of the switch so can't really tell but it could be.

[Lyates1987]

Still having a hard time figuring out what's going on with the bridged channel. I want to start jiggling wires and do stuff like that while it's on but I'm kinda scared shitless to do that. I usually bias my own amps but I haven't done anything beyond that except for replacing 1 resistor on my jcm2000 but the amp was off of course. Think I might get a decent shock with this amp? The only reason I want to do this is because it almost sounds like a loose connection somewhere, like when you only have 1 side working on your stereo and you hear the other side working a little bit when jiggling the connections, but it's hard to find with the amp off. If I can audibly hear it get louder I can narrow down what is causing this, just don't want to get electrocuted.

[MarshallJMP]

Why do you think it's a loose connection?

[Lyates1987]

Why do you think it's a loose connection?

It sounds like it wants to get loud but it's not getting all the juice like there's a cold solder. I'm just wanting to jiggle the wires connected to the jacks a little to see if it does anything or helps me find where the problem is.