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Old 24th February 2010, 10:18 AM   #1
pergo is offline pergo  Italy
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Default PPI 2150AM missed components

Hi everyone,

a friend give me an old PPI 2150AM broken, with some missed components in the power supply.
All components are between trafo and rail capacitors.

If anyone knows their value:

r76:
c46:
q45:
r115:
r80:
r77:
r73:
r72:
c33:
c34:
c55:
c31:
c34:
q44:
r121:
r116:
q63:
r79:
r114:
r78:
r119:
r118:
cr29:
c32:
c60:
q69:
q42:
c44:
FC: triple inductor?

my revision in K but i think others are egual.

I've already replace output transistor with new BD911 and BD912, and opa's with NE5532

thank you very much everyone.
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Old 24th February 2010, 04:44 PM   #2
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Location: Louisiana
Can you post a photo of that area of the board?
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Old 24th February 2010, 05:13 PM   #3
pergo is offline pergo  Italy
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hi Mr.Babin,

this is the area:

http://img517.imageshack.us/img517/3406/dscn1030.jpg


sorry for the resolution.

i know FETs, caps, etc..but not the components listed in the first post.

thank you
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Old 25th February 2010, 12:34 AM   #4
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pergo, email me.

babin_perry@yahoo.com
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Old 25th February 2010, 07:41 AM   #5
pergo is offline pergo  Italy
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email sent
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Old 27th February 2010, 05:27 PM   #6
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Default 2050am

send me an email and I'll send pics ,Maybe you can get most info from that.One thing to note though is that mine has different mosfets than what you stated, Mine has :2N6490 (4x), 2N6487(x4), and 125N06(x6). Then send me another message telling me what you can't ID. Rob. robert.molnar@sympatico.ca
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Old 27th February 2010, 06:35 PM   #7
pergo is offline pergo  Italy
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sorry for no updates.

i resoldered new components, thanks to Perry Babin, via email.

now, the amp works very well with a "trick" (pin9 shorted to pin16 of SG3525).
In few days, i'll check it in my car
In my lab, burn-in test in ok

for outputs, i use new BD911/912. For power supply i used STP60N06 with 22ohm gate resistor. Not original parts, but good upgrade.

Last edited by pergo; 27th February 2010 at 06:43 PM.
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Old 27th February 2010, 07:15 PM   #8
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Actually I need to replace mine can you give me a little more info on these upgrades ? I'm just getting into this so a little green. Thanks .Rob
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Old 27th February 2010, 07:40 PM   #9
pergo is offline pergo  Italy
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everytime i've to replace 2n6488 and 2n6491, i buy BD911 and BD912.
Are more reliable, very cheap, direct substitute/upgrade. Sound egual.

2n6488 --> BD911
2n6491 --> bd912

For the mosfet power supply, i use common mosfet like IRFZ44, STP50N06, STP55NF06, STP60N06.
But, you have to change original 470ohm gate resistor, with something like 33ohm.

I used, for my old 2150AM (that i've sold) STP36N06 (very low gate capacitance) + 47ohm gate resistor with success.

Now, for this PPI (with STP60N06), i'll try IRF3205 (110A each!) that i usually use in other amplifier and in my SMPS' diy projects. Obviously, i'll reduce gate resistor to 10ohm, and replace R81 and R91 with 1k, for fast gate discharge.
I don't think if SG3525 can directly drive 5 pairs of IRF3205. I've to try to mount all of them (i always start with 2 pair)
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Old 27th February 2010, 08:06 PM   #10
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Default 2050am

Ok, since I'm new to this I'll try your proven upgrades. Can you tell me locations of gate resistors? Thanks for the help! Rob
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