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Where is Singlepower? Where is Mikhail? - Page 108

post #1606 of 1953
No, I have not opened my amps up. My PPX3-6SN7 I ordered new. My MPX3, I bought second hand here on the forum. I bought my PPX3 way before Mikhail started his down fall. I had no problems with him during the build or after when I wanted adapters. He even went as far as to overnight out a set of adapters that got lost by UPS. So, in my case it does sadden me how he has gone down hill.

I feel for the people getting the shaft from Mikhail. I am a firm believer in what comes around goes around.... So, Mikhail will get his one day. And sadly it seems it is long overdue.
post #1607 of 1953
On the subject of opening up amps, has anyone found it easy to open up an SP that is in the PPX, MPX, Supra black case. He uses small (1/16") hex head case screws and torques them down like all get out. When I first opened my case a year or so ago, I mangled the hex sockets and when I put the amp back together, I now find that my efforts to tighten the two mangled nuts have resulted probably in cross threading them. Now I might have to tap new holes. That's not a bad idea, by the way. I suggest you go to a couple sizes bigger (inches or metric) and use a barrel head with teflon washers.

By the way, I don't see any burn signs on the board. It does get hot back there with the high voltage option and there are several ways SP could have engineered a better air flow around the board and between the case. But this stuff is all relatively minor compared to the other pictures of the SS unit.
post #1608 of 1953
Quote:
Originally Posted by mbd2884 View Post
mrarroyo posted a picture of his MPX3 where his board is also burning. This after Mikhail did over $3000 worth of upgrades.

Also pointing out design flaw is not trolling for those who are whining.




Actually if you are going to post my picture and my story you should get it right. While it is true the amp has had a lot of mods they were not all done after I purchased the unit. I had about $1,500 worth of mods done plus I purchased a fourth tube adapter ($100) and few hundred dollars worth of tubes.

Contrary to what you are implying my board is not burning up. There is an slight coloration that can be seen on the top right of the picture I posted (done so on several ocasions so this is not a new picture). This coloration was there when I purchased the unit used and has not change in size or color in the 10 months I have owned the MPX3.

At the time I had Mikhail perform the mods I asked him about the discoloration. His response was that it was nothing to be concerned about, for someone who has been taking money from owners to mod amps it was a good signal that he did not think he needed more money to fix it. It ratified to me it was not a big deal. BTW, as an owner of lots of electronics I can say that many units by other manufacturers have discolored boards as well and which do not mean a failure is near.
post #1609 of 1953
It could just be burnt flux? I've seen that discoloration on my Extreme amp before as well.
post #1610 of 1953
Miguel, had that mosfet already been moved off board like in the pic when you bought it? You can tell it was originally soldered directly to the PCB and generating too much heat, so it had to be moved up away from the board like that to prevent further heat damage to it.
post #1611 of 1953
Quote:
Originally Posted by Fitz View Post
Miguel, had that mosfet already been moved off board like in the pic when you bought it? You can tell it was originally soldered directly to the PCB and generating too much heat, so it had to be moved up away from the board like that to prevent further heat damage to it.
Hi there Fitz! I thought that it was installed as per the pic I posted all along. However I found a picture from Tyrion's FS Post and now I realize that Mikhail must have moved it when he did the mods for me. Here is a pic I cropped from one posted by Tyrion.

post #1612 of 1953
Quote:
Originally Posted by Fitz View Post
Miguel, had that mosfet already been moved off board like in the pic when you bought it? You can tell it was originally soldered directly to the PCB and generating too much heat, so it had to be moved up away from the board like that to prevent further heat damage to it.
yes, that's the most likely thing that happened... it should be fine now that
the chip is away from the board.
post #1613 of 1953
I wonder how many MPX3's there are in circulation that haven't had that component moved?
post #1614 of 1953
Quote:
Originally Posted by mrarroyo View Post
Hi there Fitz! I thought that it was installed as per the pic I posted all along. However I found a picture from Tyrion's FS Post and now I realize that Mikhail must have moved it when he did the mods for me. Here is a pic I cropped from one posted by Tyrion.

No wonder... it wasn't heatsinked to anything at all originally. That's just brilliant.
post #1615 of 1953
Quote:
Originally Posted by Fitz View Post
No wonder... it wasn't heatsinked to anything at all originally. That's just brilliant.
I was thinking the same thing.
post #1616 of 1953
What is that Mosfet used for?
post #1617 of 1953
Fitz, should I add a heatsink? I would think that now it is not needed but if you think I should I have the type that is screwed and the type that is glued on. Look forward to your advise, thanks.
post #1618 of 1953
Quote:
Originally Posted by Skylab View Post
What is that Mosfet used for?
It is right near the IEC inlet, so most likely part of the power supply.
post #1619 of 1953
Quote:
Originally Posted by Beefy View Post
It is right near the IEC inlet, so most likely part of the power supply.
That'd be my guess as well... B+ regulator maybe?



Quote:
Originally Posted by mrarroyo View Post
Fitz, should I add a heatsink? I would think that now it is not needed but if you think I should I have the type that is screwed and the type that is glued on. Look forward to your advise, thanks.

Since it's using the chassis as a heatsink, it's probably ok. See how hot that area gets after the amp's been on a few hours; if you can comfortably hold your finger to that part of the chassis for several seconds then it's fine.
post #1620 of 1953
Looking, looking, looking....where is it exactly.....in both diagrams? (I don't doubt it's there, I just can't see it).
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