Early outlaw?

Weaklink · Post by **Weaklink** » Wed Apr 29, 2015 6:42 pm

Got an outlaw today and it doesn't have to cutout above the m100 caps. It also has green transistors in the m100. And the caps are smaller in the m50 side. Both boards are rev a. In my other outlaw the m50 is rev b. Oilworkers #914 has the cut, black transistors and normal caps. Think this one might be between #900-#913? Anyone have a number lower than 914?

vwdude · Post by **vwdude** » Wed Apr 29, 2015 7:23 pm

Sounds like you might be right. I'm curious to see what some of the gurus say.

Is it me or does that last picture look like a short waiting to happen? I'd rotate that negative terminal away from the positive side.

Post by **ttocs** » Thu Apr 30, 2015 2:03 am

looks like some of the transistors are using pads and some with cream? If that is the case I would guess it was a repair.

zeropoint0.5 · Post by **zeropoint0.5** » Thu Apr 30, 2015 5:09 am

ttocs wrote:looks like some of the transistors are using pads and some with cream? If that is the case I would guess it was a repair.

not really. the M100 section are with paste, the M50 section with silpads......

fet's/transistors with metal on the back side Always have to have a silpad so they never can touch the heatsink.....

the other ones just need cooling paste............

Post by **Eric D** » Thu Apr 30, 2015 3:35 pm

zeropoint0.5 wrote:
ttocs wrote:looks like some of the transistors are using pads and some with cream? If that is the case I would guess it was a repair.
not really. the M100 section are with paste, the M50 section with silpads......

fet's/transistors with metal on the back side Always have to have a silpad so they never can touch the heatsink.....

the other ones just need cooling paste............

This is true about 90% of the time. In the case of ZPA amps, and the ZX series for example, they have metal contact transistors right up against the heatsink with no pads, only paste. The reason they can get away with this is anodized aluminum is not conductive (on the surface). In the case of the M series, PG might have actually been able to get away with no pads, but if the aluminum was not totally consistent they could have run into issues. My guess is this is why they went with pads for most of the devices.

Post by **ttocs** » Thu Apr 30, 2015 5:59 pm

that's interesting. I never got into the guts of the M's enough to notice but I would have thought that they used the same mountings.

zeropoint0.5 · Post by **zeropoint0.5** » Fri May 01, 2015 12:01 pm

Eric D wrote:
zeropoint0.5 wrote:
ttocs wrote:looks like some of the transistors are using pads and some with cream? If that is the case I would guess it was a repair.
not really. the M100 section are with paste, the M50 section with silpads......

fet's/transistors with metal on the back side Always have to have a silpad so they never can touch the heatsink.....

the other ones just need cooling paste............
This is true about 90% of the time. In the case of ZPA amps, and the ZX series for example, they have metal contact transistors right up against the heatsink with no pads, only paste. The reason they can get away with this is anodized aluminum is not conductive (on the surface). In the case of the M series, PG might have actually been able to get away with no pads, but if the aluminum was not totally consistent they could have run into issues. My guess is this is why they went with pads for most of the devices.

yes i should have written for M/MS/MPS series.......the bottom line is, if there was a silpad, you have to replace with a new silpad, not with paste,

if there wast paste, don't put a silpad in place......

the zx/zpa have a different cooling system....( it's even better, they never get so hot like MS/M/MPS without shroud)

Early outlaw?

Early outlaw?

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