Rockford MEHSA needed

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Jat40

Jat40

Member
Joined 2010
Been working to repair this T4000.1, see thread below, for a while now. The amp runs but has an output whine that I just can't locate the cause. The only difference in this amp and others that I have repaired, is it is missing the MEHSA boards in the power supply. I got the amp and these were missing. As a temp fix, I am using insulators.

So, my next option is to see if anyone has a compliment of MEHSA boards for a T4000.1 power supply that they would be willing to part with?

http://www.diyaudio.com/forums/car-audio/176656-rockford-fosgate-t4000-output-whine.html
 
Jat40

Jat40

Member
Joined 2010
As reference, these are the MEHSA boards
 

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Dr Zeus

Dr Zeus

Member
Joined 2010
I did, and I realize what I can do to convert this MEHSA for my 4 output transistors... However, this MEHSA board has a single surface mount transistor right on it and would need to be retro-replaced as well.

Can I convert it to say a TO-92 style transistor? What transistor could be a suitable replacement?
 
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Dr Zeus

Dr Zeus

Member
Joined 2010
Rockford Punch 5002. The one under the \puncht5002\ folder on the DVD is the one.

Is the surface mount transistor a 6B? BAT54A? Barrier Diode? Also it looks like from the picture theres a single surface resistor or diode as well.
 
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P

Perry Babin

Member
Joined 2003
bcae1.com
It's a transistor. An MPSA06 should be OK as a sub but you'll have to do some testing after setting the bias to confirm that the bias is not drifting.

You'd have to find the terminals of the 3-legged jumper that correspond to the base, collector and emitter of the SMD transistor so you'll know how to install the TO-92 transistor.

For this amp, I'd suggest using the Kapton MT film or Mica as insulators. Kapton tape may not work well enough.
 
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