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MP-2A preamp
MP-2A preamp
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Old 14th January 2013, 11:47 PM   #1
felipemuniz is offline felipemuniz  Brazil
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Join Date: Mar 2012
Default MP-2A preamp

I'm with the MP-2A tube preamp here with a little problem. The power board have a bridge rectifier for the heaters, that begins with 9V from the toroidal transformer and go to the bridge, MB102. After this, the voltage is regulated on the LT1084CP and go to the preamp board.
Well that problem is that the bridge is getting too hot. In fact, the soldering was melted and the fiber pcb was burned a little.
The first thing that I did, was remove the wire heaters from the board, after fix the soldering and I turned on to see if the bridge get hot, but the result was negative.
Now I'm looking for a easy solution for fix this, maybe using separated diodes, or some bridge easy to buy, or a heat sink, whatever...
Thank you for reading.

Last edited by felipemuniz; 14th January 2013 at 11:50 PM.
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Old 15th January 2013, 06:48 AM   #2
Tesla88 is offline Tesla88  Italy
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Location: Italy
Any schematic?
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