mur3040pt options

[ben04srt]

I have a kicker dx700 that has a broken rectifier can"t find any at mouser, digi key,etc.

It is a MUR3040pt anyone know a different part I can use?

Thanks.

 

[Perry Babin]

https://octopart.com/search?q=mur3040pt

 

[ben04srt]

Thanks,
What would cause the middle leg to burn on these?
Would this be why the amp would cut out the higher the volume went?

 

[Perry Babin]

IT probably cracked from vibration and arc'd repeatedly to make it appear burned.

I don't know if it could cause the amp to cut out but if it's the only rectifier for either rail, it could cause the amp to drive DC to the output which could cause some amps to shut down.

 

[ben04srt]

This amp has 2 MUR3040's side by side. (this is the old zr style dx amp)
No Dc on output when I checked before I took it apart.

The amp just didn't seem to have the power it had before.
I thought maybe the crossover card solder joints were the cause till I saw the burnt rectifier.

 

[PapaZBill]

I seem to remember this being an issue with DX700, and replacing them with a hardier case style. It's been a number of years, so I can't be sure. If you are still having an power issue, I can dig up service notes and advice.

 

[ben04srt]

To-247 is the case style in the amp. What would be considered a hardier case style?

Thanks,
Ben

 

[PapaZBill]

To-247 is the case style in the amp. What would be considered a hardier case style?

Thanks,
Ben

I may be mistaken. It's been awhile since I've worked on these amps and may be confusing it with another amp.

 

[ben04srt]

I think the dx350 has to-220 style.

 

[Perry Babin]

The part number that you gave is a TO-218 case. The photos I have for the DX700 show a TO-218 case (x2). The DX350 has a single TO-247 case rectifier but I can't see the part number.

 

[ben04srt]

I am not very good at the sizes, but it is as big the power supply fets.
I thought they were 247.
I am curious if a mur3040wt would work, digi-key has some.
The link you gave has them but 100$ min order is what it says.

 

[Perry Babin]

If you're going with the TO-247 case, the APT30D40BCTG-ND may be a good choice.

 

[ben04srt]

Should I replace both or just the broken one?

 

[Perry Babin]

Both.

Was the leg too badly damaged to solder it back together to see if there are any other problems with the amp?

 

[ben04srt]

It broke completely off all the legs when I moved it.

 

[eyoung]

mount 2 back to back in same holes double the power . put a heat sink between them...
regards, E

 

[ben04srt]

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