Precision Power 2150AM

S Merlington · 2013-01-20 3:01 am

Anyone know what power supply fets belong in this amp??

Got the amp and its missing all of the outputs and power supply fets along with other things..

warpedhifi · 2013-01-20 3:05 am

Is it the white one? If so, I will check when I get home, unless you find out before.

S Merlington · 2013-01-20 3:10 am

Yeah its the white one Also i need to know the value of the gate resistors for the power supply fets..

Someone has changed them and right now they are 470 ohms is what in the amp but that doesnt seem right ..

seankane · 2013-01-20 3:14 am

Cant you just use IRF3205 FETS and 47 ohm gates?

Those seem to be the most reliable and robust P/S FETS I have used thus far.

S Merlington · 2013-01-20 3:19 am

The owner of the amp says he wants it as close to as orginal as possible..

So wondering what the orginal fets and gate resistors were ??

He collects theese amps and told me to try and find all the orginal part numbers if possible ...

Perry Babin · 2013-01-20 3:21 am

I can't tell you what they used but the IRFZ34s were commonly used in the older amps with very high value gate resistors. If you use anything like the Z44s, you'll have to change the gate resistors.

S Merlington · 2013-01-20 3:24 am

Would the Z48's work or would the Z44's be a better choice??

If either will work what do i need to change the gate resistors to ??

Also do you happen to have a high res pic of the board (power supply fet section) ??

right behind the power and ground wires the board is marked C29 but only has 1 thru hole to i dont know what goes there

Perry Babin · 2013-01-20 3:32 am

I only have photos of the 2150M.

The Z44s with 100 ohm gate resistors will be better than the originals. If you use the Z48s, use something like a 68 or 75 ohm resistor.

S Merlington · 2013-01-20 3:36 am

Ok so i missing the cap..

So would the 200mf 50 volt cap be good to use in this amp also?

And if so is it a BI-Polar cap ?

Perry Babin · 2013-01-20 3:47 am

It's 2200uf. It's a standard capacitor.

evianamp2011 · 2013-01-20 4:55 am

And they aren't cheap.

warpedhifi · 2013-01-20 3:35 pm

I checked my amp and the power supply mosfets are MTP25N05E, and they are Q46-Q55. Hope this helps.

S Merlington · 2013-01-25 4:31 pm

Outputs are arriving today does anyone know the order they go in ? As far as does the 2n6491's go in the positive or negative rail ?

warpedhifi · 2013-01-26 10:58 am

Just curious, what did you end up using for the power supply mosfets and gate resistors???

S Merlington · 2013-01-26 2:20 pm

IRFZ44N'S with 100 ohm gate resistors ..

I talked the owner of the amp into upgrading the parts..

warpedhifi · 2013-01-26 10:59 pm

In the one I have, the 2n6490's (PNP) are q34-q38 and q14-q18. And the NPN 2n6487's are q8-q12 and q27-q31.

Precision Power 2150AM

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