Originally Posted by chumley
I own recent iterations of two Singlepower amps (bought 'mint' used, from a business associate). I've listened extensively, with a wide variety of great quality tubes, these amps (PPX3, Supra).
They are capable of supplying great sound quality; they are also designed and built, IMO, in such a way as to be among the greatest-sounding fire/electrocution hazards extent.
Great sound quality is, I would imagine, almost every forum member's '#1 priority'. But safety, in an 800 volt (yeah, I know- it's not so much the voltage that'll get ya; it's the amperage), device such as the Supra, had better be right up there on the list, if only so one can keep listening to its 'great sound quality' in safety...
As for Mastergill's incisive observation:
"Personally i've found these tube amps design around only one dual triode for input very cheap. For $2,000 i want a totally dual mono design with 2 dual triode as input and two separated power rectifier/regulator at least.
In 'pure' class A of curse."
I agree, and own two other amps that answer that description... they both sound superior to either Singlepower, IMO, and for various reasons- including design, as well as construction.
Dual mono with balanced cabling to my HD650s, etc., has inherently better capacity for the highest quality output, IMO. Singlepower amps don't sound 'bad', they sound 'great', just not * as * great (again, IMO), as the alternative amp designs to which Mastergill refers. I've put my money where my mouth is with regard to those designs; I've ponied up the funds for those alternative designs as well, to good effect.
As for the aforemenioned safety issues: every person I have personally asked to examine, then comment/give advice on the use of both my Singlepower amps has, to a man, strongly suggested I cease using them immediately. This includes 3 Electrical Engineers, all (commercially) State-certified; one has worked as a tenured professor in the field for 22 years at a nearby College. The specific design/construction reasons (none of their given reasons has anything to do with the working 'condition' of the amps), they cite would be, they tell me, immediately apparent to any Engineer well-versed in building, inspecting, and/or designing reliably safe high-voltage electronic devices. Anyone reading this post obviously doesn't have to take their word for this- but I choose to.
Although I no longer listen to music through the Singlepowers, I will never sell them. Not because they represent the highest quality sound I can obtain (they in no way do). I will never sell them because I want a clear conscience. If someone came to harm because one of these amps malfunctioned with tragic results, my listening experience thereafter, on ANY amp, would be squelched forever.
Again, the above is strictly all IMO and a few friends' collective IMO's... the fact that they are all eminently more qualified to comment than I am means that their opinions are here strictly by proxy. I find it ironic that I, the sole layperson in the group, am here giving my * personal * opinion on Singlepower amps' safety. And, as I say, the above is OPINION... but, in 3 out of 4 of the opinions I cite, they are at least well-informed, professional opinions.
sacd lover: as far as your statement that '...it won't affect me at all." I humbly posit that you ultimately have no way of knowing this. Rather, you seem to have made the choice that whatever specific risks associated with the use of Singlepower amps may or may not be, you know what you like- sound quality- and that is your priority and your perogative. BUT- whether your choice to continue to own and use Singlepower amps is informed or not, with regard to any safety issues borne out of the design, manufacturing and construction of Singlepower products, is the most relevent issue facing you and every other current (myself included), and future Singlepower owner- not sound quality per se.
Also IMO- anyone who wants to get their answers about Singlepower amps' safety should (at least try to):
a) obtain pics of the interior of the model of Singlepower amp they are considering purchasing, and (privately) share said pics with someone whose experience and knowledge in the area of high-voltage electronic design and construction they trust
b) decide what's paramount to their purchase or continuing ownership- sound quality alone, or any serious safety issues are pointed out by their contact with the 'trusted third party' in (a).
My 2 cents... I hope the forum understands why I feel I HAD to put that out there...
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