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Old 6th February 2010, 10:51 PM   #1
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Default Mtx ptp251d

got an MTX PTP251D that i need to know the values of the following resistors:

R628
R636
R629
R637

both Fet602 and FET603 are blown. and it took out all 4 of those resistors.

thanks
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Old 6th February 2010, 11:14 PM   #2
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If you look at the traces, these should be in two parallel groups. In a similar amp, only 628 and 629 are used. Their value is 61.9 ohms. This amp uses HUF75339Ps. If yours used the same, anything that gives approximately the same resistance will work. The attached photo is the supply in this amp.
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Old 6th February 2010, 11:44 PM   #3
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well, i had a junk MTX here that i scrapped out becausei never could fix it. R628 and R629 are the same designators to the FETs, and they were 47R5

But yes, that is correct. each set are in parallel.
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Old 7th February 2010, 03:54 AM   #4
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I used a couple of 75343 transistors, as thats what i had. same as the 339 but lower RDS on.

used a couple 47 ohm resistors and all is well. works like a charm. Still though, something took out the power supply... but output stage is ok. and amp works.
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