or Connect
Head-Fi.org › Forums › Equipment Forums › Headphone Amps (full-size) › Warning About The Singlepower Extreme - Owners Please Read
New Posts  All Forums:Forum Nav:

Warning About The Singlepower Extreme - Owners Please Read - Page 16

post #226 of 407
Hi,
I decided to open my Extreme again (the last time I saw the inside was in Nov. 2008)

[IMG][/IMG]

This is the Extreme_IN REV A Feb 2007 version. I think this is stock Extreme except for a stepped attenuator.

R54 looked like this

[IMG][/IMG]

Two 25ohm 6.5w in parallel

And I confirmed the trans was 266N12. It looked like this

[IMG][/IMG]

And... what do you guys think, should I replace the R54?
Also, assuming it a stock Extreme (2007), can I replace the tranny with aforementioned Electraprint or Edcor ones (or possibly addition of Hammond 182e117 toroidal )?
Thanks
post #227 of 407
Transformer definitely on its way to complete burnout.
The two resistors are actually 250 milliohms each.

When you replace the transformer you will need to adjust the
resistors to get the voltage to as close to 6.3 VDC as possible.

The electraprint transformer is actually lightly low so you will end
up shorting out the 2 resistors.
post #228 of 407
Just wanted to bring my thread up here as I'm working on fixing up my MPX3 in the DIY section. Any help/contribution/advice/suggestions would be greatly appreciated.

http://www.head-fi.org/forums/f6/sin...r-mpx3-444640/

Thanks
post #229 of 407
Dr. Gilmore,
Thanks for your imput. I will get Electraprint transformer soon.

Just one more question
Quote:
Originally Posted by kevin gilmore View Post
The electraprint transformer is actually lightly low so you will end up shorting out the 2 resistors.
By shorting out the 2 resistors, you mean this?
Sorry for very newbie question

[IMG][/IMG]

Thanks again
post #230 of 407
Yes, but you should install the new transformer first and measure the heater voltage. Then you can figure out what size resistor you need or if you simply need to short it.
post #231 of 407
Quote:
Originally Posted by diego View Post
Yes, but you should install the new transformer first and measure the heater voltage. Then you can figure out what size resistor you need in there or if you simply need to short it.
Thanks, I have just ordered the transformer at Electra-Print.
post #232 of 407
The Singlepower fiasco reminds me of some comments from an audio dealer I know and trust. I asked what he thought of Audio Research stereo power tube amps a while back, and he said that although the amps sound wonderful, every one he ever owned eventually failed in "spectaculur" fashion. That suggests that amps made by well-known amp manufacturers with long histories and good reputations also may have design flaws...maybe not of the magnitued of the Singlepower amps, but enough to require expensive repairs.

As much as I am annoyed and stunned by Mikhail's ubiquitous fraud, I still am addicted to the Singlepower Extreme. As crappy as the amp's build quality was, it still sounded damn good to me. I have been using my Blue Circle Hat Peed Thingee while the Singlepower amp is in for repair, and I now see how deficient it is relative to the Extreme. Yes, the Blue Circle amp is good, but it just falls short in dynamics and soundstage.vIn any case, I am looking forward to getting my Singlepower amp back and restored to good health. I will post more details on diagnosis and repair costs when the amp is repaired.
post #233 of 407

Extremely Addicted

"I still am addicted to the Singlepower Extreme."

Me too. I was going to sell mine due to all the huff here--even after I had a dual transformer put in.. Since I have a nice custom DIY job I also love, and times are tight, I listed it on Agon.

A guy bought it, but I told him to read some of the posts here before paying. He took my advice. He laughed--thought almost all were silly--but--he asked if he could back out. He was worried he could never flip it. I said of course he can back out--I was glad, in retrospect. There was other interest, when I directed them to this site, they all backed out. They did not care that it now had dual transformers, one for the plates, and one for the heaters, or that the interior is pristine, and certified by two techs. Fine by me.

I am glad I still have it, because its an extraordinary sounding headphone amp, especially once the transformer is uprated, as many have discovered, it then gets even better then before.

My 17 YO has listened to all my headphone amps carefully over the past seven years--starting as a tot, he quickly heard the difference between tube and SS. Remarkably, he can discern the EarMax Pro when it has Telefunken E188CC in it and a coin-base 12AT7--every time, even between months intervals. Maybe its genetic; it remains a favorite of his as well. The benefit is that he has no preconceptions. He tells it like he hears it. Usually, he has no idea which amp is playing. In fact, I have two HD600/Cardas phones(for bedroom and office) so I compare amps 'side-by-side' now and then--to 'be sure'. Since I am a big fan of the experimental method, I even have a rat shack SPL meter handy to make sure amplitudes are equal when doing a blinded test.

He happened to listen to the upgraded Extreme on Friday night and said "Dad, whatever this is, it's the best I have ever heard--except for that big funky one you have there". I asked how did he know this was not that one, which was also on. He said: "I've never heard bass like this before, not even from the big one; is this new"?

So, from the mouth of babes. However, I made him leave the room--just in case my Extreme explodes like a grenade, or goes up like a fireball, or strikes him with a bolt of electricity, or jumps off the shelf and cracks his skull with its battleship of a case--which in fact--is grenade proof. Just in case, the Extreme remains off limits to little girls and boys, apparently.

Enjoy your amp when it gets back. Based on what I and others have reported, you will be pleasantly surprised, and you will be hard pressed to find a better sounding SET-OTL headphone amp at any price that can drive any phone. One day, these will be classics--or someone will simply copy the design and sell them, probably for much more than SP did, or they too will go under.

Thanks to all on this site, especially the Doc, who have offered fair and productive advice, sane recommendations, great guidance and have had great patience with newbies, like myself. As for others, they probably meant well. Maybe--this saga is winding down, or, it could percolate on and on. I think the former.
post #234 of 407
Quote:
Originally Posted by nurxhunter View Post
"I still am addicted to the Singlepower Extreme."

Me too. I was going to sell mine due to all the huff here--even after I had a dual transformer put in.. Since I have a nice custom DIY job I also love, and times are tight, I listed it on Agon.

A guy bought it, but I told him to read some of the posts here before paying. He took my advice. He laughed--thought almost all were silly--but--he asked if he could back out. He was worried he could never flip it. I said of course he can back out--I was glad, in retrospect. There was other interest, when I directed them to this site, they all backed out. They did not care that it now had dual transformers, one for the plates, and one for the heaters, or that the interior is pristine, and certified by two techs. Fine by me.

I am glad I still have it, because its an extraordinary sounding headphone amp, especially once the transformer is uprated, as many have discovered, it then gets even better then before.

My 17 YO has listened to all my headphone amps carefully over the past seven years--starting as a tot, he quickly heard the difference between tube and SS. Remarkably, he can discern the EarMax Pro when it has Telefunken E188CC in it and a coin-base 12AT7--every time, even between months intervals. Maybe its genetic; it remains a favorite of his as well. The benefit is that he has no preconceptions. He tells it like he hears it. Usually, he has no idea which amp is playing. In fact, I have two HD600/Cardas phones(for bedroom and office) so I compare amps 'side-by-side' now and then--to 'be sure'. Since I am a big fan of the experimental method, I even have a rat shack SPL meter handy to make sure amplitudes are equal when doing a blinded test.

He happened to listen to the upgraded Extreme on Friday night and said "Dad, whatever this is, it's the best I have ever heard--except for that big funky one you have there". I asked how did he know this was not that one, which was also on. He said: "I've never heard bass like this before, not even from the big one; is this new"?

So, from the mouth of babes. However, I made him leave the room--just in case my Extreme explodes like a grenade, or goes up like a fireball, or strikes him with a bolt of electricity, or jumps off the shelf and cracks his skull with its battleship of a case--which in fact--is grenade proof. Just in case, the Extreme remains off limits to little girls and boys, apparently.

Enjoy your amp when it gets back. Based on what I and others have reported, you will be pleasantly surprised, and you will be hard pressed to find a better sounding SET-OTL headphone amp at any price that can drive any phone. One day, these will be classics--or someone will simply copy the design and sell them, probably for much more than SP did, or they too will go under.

Thanks to all on this site, especially the Doc, who have offered fair and productive advice, sane recommendations, great guidance and have had great patience with newbies, like myself. As for others, they probably meant well. Maybe--this saga is winding down, or, it could percolate on and on. I think the former.
I think it's winding down. I'm still waiting for my EE guy to build another
transformer for my MPX3. It's been two months now and I've still been
listening to it every weekend. No explosions, no light show, no lethal
shock. I've been considering other amps but when listening to my
MPX3 in the early hours of Saturday morning..I can't imagine being
without it...the sound is just INCREDIBLE.
post #235 of 407

Singlepower Extreme comments

I would like to weigh in on the Singlepower Extreme amp bandwagon. Yes, they have lost their credibility for customer service and Mikhail is impossible to deal with on just about any level. That being said, my amp was recently modified by a local electrical guru for $300: new transformer and an added filament dropping resistor wired to the bridge rectifier on the rear panel.

It sounds just as wonderful, and now has better bass. The external transformer is much cooler to touch and the case where the new transformer resides is still quite warm to touch after several hours of playing music.

Other manufacturers have equipment that fails and probably after a year or two or three charge $$$ to trouble shoot and repair their gear. And, also charge round trip shipping to you. My advice is to live with the Singlepower Exrteme or find a local repair person and move on with your life and musical enjoyment. The internet is a powerful force in today's world; but it shouldn't make you feel bad about life, or the things you love, including music.
post #236 of 407
Quote:
Originally Posted by eric stern View Post
I would like to weigh in on the Singlepower Extreme amp bandwagon. Yes, they have lost their credibility for customer service and Mikhail is impossible to deal with on just about any level. That being said, my amp was recently modified by a local electrical guru for $300: new transformer and an added filament dropping resistor wired to the bridge rectifier on the rear panel.

It sounds just as wonderful, and now has better bass. The external transformer is much cooler to touch and the case where the new transformer resides is still quite warm to touch after several hours of playing music.

Other manufacturers have equipment that fails and probably after a year or two or three charge $$$ to trouble shoot and repair their gear. And, also charge round trip shipping to you. My advice is to live with the Singlepower Exrteme or find a local repair person and move on with your life and musical enjoyment. The internet is a powerful force in today's world; but it shouldn't make you feel bad about life, or the things you love, including music.
Very well said!

I'm still waiting for my MPX3 transformer rebuild but I'm listening to it for
a few hours each weekend. I've never looked forward to listening to music
so much.

The MPX3 is here to stay.
post #237 of 407
Quote:
Originally Posted by eric stern View Post
Yes, they have lost their credibility for customer service and Mikhail is impossible to deal with on just about any level.
SinglePower amps can sound good. That's not really in dispute. However, SinglePower has lost its credibility in every way, not just with respect to its customer service.
post #238 of 407

Dawn of Extreme Rationality?

That is my experience exactly, sounds as good, better bass.

Same experience, transformer now runs barley warm, before it was rather warm.

It is worth noting the box is SEALED, virtually. Heat is released through the case metal by radiating, not through convection from vent holes. With temp. in home 5 or so degrees cooler now, the Extreme case also feels cooler. I wish my Music Reference RM9 was as cool as my Extreme. There is no hot spot I can determine; rather, the entire case gets warm. The high-ish power resistors seem to be working, I might speculate, rather than this observation being the harbinger of doom and destruction from explosion, electrocution or conflagration.

Also consistent with experience--every time anyone says anything positive about an Extreme here, someone pops in and reminds us there were build issues; funny, as if this was not already well established, especially in this thread. Never mind the positive comments are on certified units. It's like there is a posse watching. Yea, Supreme beings are watching ready to smite any happy camper, or remind the forgetful, least we somehow can forget. Once in a blue moon, a picture of a relatively minor issue appears, followed by maybe a half dozen of the faithful chiming OMG, OMG, OMG--what a monster HE was. Like clockwork--a broken alarm clock that won't shut off.

I've decided there is simply no point for me--personally in my humble opinion only, and only in my opinion--to search for an upgrade in sound from another amp to best a certified Extreme--based on my own experience and those of many on this site, a certified Extreme might be as good as a dynamic headphone amp. can get.

Yes, I am a Proud Extreme Owner, like many others here, I stand before ye all with stones and admit it once more. I like to live dangerously, clearly.

If I change my mind and do seek 'perfection' elsewhere, it would be like Billy Joel thinking he could do better than Christy.

STILL EXTREMELY HOT
post #239 of 407
Quote:
Originally Posted by nurxhunter View Post

I've decided there is simply no point for me--personally in my humble opinion only, and only in my opinion--to search for an upgrade in sound from another amp to best a certified Extreme--based on my own experience and those of many on this site, a certified Extreme might be as good as a dynamic headphone amp. can get.
I understand how you feel. Since I got my Supra back, I've listened to it every night. I can't identify any area where I would say it is lacking and would think that an upgrade or change to another amp would be something to consider. Maybe I'll consider trying some other phones just for fun, and maybe eventually I'll consider going balanced, but it just sounds so good with the tubes I've found that it is indeed hard to imagine it could get better.
post #240 of 407
I'd love to hear markmaxx's balanced job.
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Headphone Amps (full-size)
Head-Fi.org › Forums › Equipment Forums › Headphone Amps (full-size) › Warning About The Singlepower Extreme - Owners Please Read