Biased Opinions--and some facts"Singlepower was a train wreck of company, and their amps all have to be checked out to be safe, but I think it does a disservice to say that they all have to be completely gutted"
A disservice to whom? Not those who profit from the situation, and not those with grudges, albeit justified. This thread has all types posting.
Thanks for pointing out with such class that the thread may be getting a little extreme again.
Here is what we know, summarizing the posts so far; and if any of this is wrong, please point to the source of the information
-The transformers on all stock Extremes or all SinglePower Extremes appear to require replacement. This is not horribly expensive ($175-$300, installed depending on the transformer and hourly labor cost).
-Some other parts may, or may not, need replacing. This depends on individual cases. When there is a problem, it has been visible to the naked eye, usually, and is a straightforward fix--typically, for a competent tech. This is known, simply, as a part failure, which happens in the finest gear.
--The upgraded transformers may improve the sound some. It is not dramatic. Other parts (except in failure) cannot really be expected to improve the sound, because they are already of pretty high quality on Stock Extremes.
--More likely, you can refine the sound of a stock Extreme to your own personal preference by tube rolling or cable swapping than by giving a tech a blank check.
-You can spend $1,200 (or more) building a new DIY amp into the Extreme shell; or, you can spend around $200 repairing a true Extreme, and taking it home as a true Extreme, and enjoying it with new confidence, after certified by any tech who does this for a living--they are not hard to find--a list of such techs has been posted.
-The majority of issues appear to be with customized Extremes, especially on MPX3 boards.
--The issues with true STOCK Extremes have for the most part been more minor: (a) the tranny ($70-$150 part cost) b) a resistor for a few pennies a part; c) possibly a cap.
-If an Extreme becomes highly modified, such that new circuitry is added, and not simply new components swapped, then it is no longer an Extreme, by definition. No one knows what is is --other than it becomes another DIY with its own set of UNKNOWN risks, as for any DIY. At least the SP issues are now well known.
-All SinglePower products got universally glowing reviews everywhere for a very long time. It is hard to find a negative review of the sound for stock amps, if such reviews exist.
-If Modified Extremes sound better than the original, then a new rating system is needed, because the original achieved the highest reviews possible sound-wise, everywhere, from everyone.
--As SinglePower was going under, the owner left a lot of people hanging, as usually happens when an enterprise goes under. Some of those who lost money, or have friends who did, are not big fans of the name. You can find them in this thread, and in the other 'explosive' thread.
--These threads have provided a service to guide members to the core issues, which I have tried to enumerate above for the SinglePower Extreme, as fairly as I could, given the disclosure that I remain a big fan of SinglePower designs, but I regret that some lost money or endured hassle with an enterprise that its owner could not effectively maintain. Everyone would be better off if MR got investors when the time was right, or at least hired a business manager. Old story, for centuries, probably.