MTX Thunder 1501D

[spooney]

do the smaller mtx class D's from this series have the same problem?I've never noticed it on the 421D and the 801D.Its just seems like the noise is overly loud to me.Is there supposed to be one of those heat conductive pads on top of the transformer also?Maybe to help cut down on the noise.

 

[shagone]

do the smaller mtx class D's from this series have the same problem?I've never noticed it on the 421D and the 801D.Its just seems like the noise is overly loud to me.Is there supposed to be one of those heat conductive pads on top of the transformer also?Maybe to help cut down on the noise.

i have used silicone on and around the transformer to cut down noise and to stop it from vibrating too. it worked for me but i can't remember what model that was on.

 

[spooney]

the use of silicone won't allow the transformer to heat up too much will it?

 

[Perry Babin]

Too much silicone will cause the transformer to run hotter than normal. Silicone or epoxy stop the noise when the noise is due to loose windings (noise stops when you lightly touch the windings) but that's not the case for that series of MTX amps.

I'd leave it as it is. It's likely to be in the trunk and the noise is only bad when you drive it hard (so you won't hear it anyway).

 

[shagone]

Too much silicone will cause the transformer to run hotter than normal. Silicone or epoxy stop the noise when the noise is due to loose windings (noise stops when you lightly touch the windings) but that's not the case for that series of MTX amps.

I'd leave it as it is. It's likely to be in the trunk and the noise is only bad when you drive it hard (so you won't hear it anyway).

Thanks for the tip Perry. i tried to not use too much. just around the base and up top only where the leads come down into the board. no problems so far.

 

[Alexprotone]

Good day ... I really need an amplifier circuit MTX Thunder 1501D. He repaired to me and there were problems in the surrounding chip THAT2155 ... I need only a small fragment of the scheme. Thank you.

 

[Perry Babin]

What sort of problem?

 

[Alexprotone]

Good afternoon. Defective diodes D181, D183, resistor with the emitter of the transistor A56 overheating, but measured as 1.3 kOm.Tranzistors A56, A42 good.Don't know whether it solves the whole chip 2155.Power amplifier was damaged. Sorry for my english, I'm from Russia.

 

[Perry Babin]

I don't quite understand but the following file may help:
http://www.bcae1.com/temp/mtxcompressordrivecircuit01.swf

You can bypass the 2155 by removing it and inserting a 1k ohm resistor between the input and output pins.

 

[Alexprotone]

Thank you! This is what I need. Come to Krasnoyarsk for a visit.