Job 250 monos amps: absolutely wonderful ...

Joe, is your 250's making any noise in the speakers when not playing any music?

I just can't seem to get rid of it... I've tried everything I can think about. Different cables, different sources, everything else disconnected etc... it's not acceptable the way it is, I don't even need to put my ear very close to the speaker, I can hear it from the listening position.

I'm in touch with the Job service guys, hopefully we can sort it out but I'm starting to run out of ideas....

I really want these to work, becuase when playing music they sound absolutely fabolous....
 
My Job 250 monos, like all my Job gear is dead silent. I do use either my Burmester 948 or a PS Audio Humbuster III with the amps and plugged directly into the wall AC outlets. I have dedicated outlets as well but my AC is still not the best. All my gear had been silent this way, and my Job gear especially has been silent.

I absolutely hope you get this sorted out because my Job gear will be the last to leave my hands when I can no longer hear. It's some of the best gear regardless of price for me.
 
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VoicesInMyHead said:
Joe, is your 250's making any noise in the speakers when not playing any music?

I just can't seem to get rid of it... I've tried everything I can think about. Different cables, different sources, everything else disconnected etc... it's not acceptable the way it is, I don't even need to put my ear very close to the speaker, I can hear it from the listening position.

I'm in touch with the Job service guys, hopefully we can sort it out but I'm starting to run out of ideas....

I really want these to work, becuase when playing music they sound absolutely fabolous....
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Do you have the noise with nothing in the Job inputs ..?
 
Hah! I JUST got it to work!!!! Finally!! And the preamp is back in the chain and was actually part of the solution. It was actually interesting to live without it for a day, the dynamics just jumped a few levels when it got back in there. I love it!

I don't dare to touch anything right now, but will try some things tomorrow just to verify the issue....

@a.wayne, I did have noise with nothing connected, oinly when I inserted the RCA plugs I got silence. Which resulted in that I bought a pair of XLR-RCA adapters. These did not seem to do anything on their own, but as a last attempt before throwing myself out of the balcony I tried inserting the preamp again while also using the RCA adapters, and it worked!

Music is a lot better on a pitch black silent background... :)
 
I'm so happy for you. They are absolutely wonderful amps. Enjoy!

Please give us us updates as you get more time on them.

ps. The RCA plugs supplied with the amps NEED to be removed, regardless. You can't use both inputs at the same time and shorting the RCAs with those plugs just shuts off the XLR too. I made that mistake myself until I read the manual.
 
I will, and finally I'm feeling comfortable to actually start any burn-in process... I will give them some time for sure, but they're already out of the box sounding wonderful I'd say... :)

Haha, yeah I know... I actually read the manual first thing because I found it so cute, just as the amps themselves....although I admit I had to read that sentence a few times to understand they should NOT be in there while using XLR. Makes me wonder WHEN you actually have any use for them... haha...
 
Ha!

In my opinion, they was no reason to ship the RCA plugs with the amps. I initially hooked up the XLR's and got no sound. I said to myself, WTF? Something is wrong. Off go the amps, out comes the manual. Lo and behold, I read the same sentence several times, thinking to myself, why even have the shorting plugs because if you use RCA they have to come out. If you use XLR, they have to come out. So, why ship them with the amps?

The Job 250 monos only get better. Enjoy the ride!!!!!
 
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VoicesInMyHead said:
Joe, is your 250's making any noise in the speakers when not playing any music?

I just can't seem to get rid of it... I've tried everything I can think about. Different cables, different sources, everything else disconnected etc... it's not acceptable the way it is, I don't even need to put my ear very close to the speaker, I can hear it from the listening position.

I'm in touch with the Job service guys, hopefully we can sort it out but I'm starting to run out of ideas....

I really want these to work, becuase when playing music they sound absolutely fabolous....
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These amps are DC coupled. Plug em direct to wall outlet and avoid any Power conditioner in between.

Also, get AC curator sweetcords if possible.

Read the 6moons review of the 225 for more insight.
With extremely low distortion, especially IM distortion, literally zero group delay distortion, ultra-wide MegaHerz bandwidth and DC coupling, extreme silence and cool operation, it can be played at high level with the same impression of ease than at low levels.

From 6 Moons:
To extrapolate for today's assignment, a/ cost-effective assembly in Switzerland is possible despite our carefully groomed image to the contrary; b/ go easy on enclosure bling and save a bundle; c/ refine and tweak a proven circuit to the hilt and make superior sound to one whose internal logic is fuzzier though it flashes all the big-name parts. On to the job at hand. With 35dB of gain and unloaded output noise of <2μV across the full bandwidth—unusually high gain, ultra low self noise—those who rightly anticipate a wide-bandwidth DC-coupled* amp to be lit up, fast and lucid to think valve preamp for a Levinson-type circuit tuning need an equally low-noise partner. More so than low-gain amps, the 225 will shine a spotlight on any noise farther up the chain. That's merely common sense but fair to point out. You could go passive or DAC-direct to eliminate redundant gain stages. Chances simply are that you'd err on the side of sinew over substance. And unless your DAC had analog volume like SOtM's sDP-1000, the 85dB of digital attenuation you might have to invoke with a 4V variable-out converter like AURALiC's Vega into the Job's 0.75V input sensitivity won't sound as good as doing it analog. Whilst my Nagra Jazz valve preamp explodes the bill, it's what I own and thus used. A fine far lower-priced alternative could come from the German house of Octave for example.
_________________________________________________________________________________________________

* Directly from the owner's manual, "the Job 225 is a DC-coupled amp without protection. If it is associated with a badly designed or defective analog preamplifier (often true for tube preamps or some 5-channel processors) the speakers could easily be damaged by DC. The Job 225 doesn't amplify DC but DC applied at the input is passed to the output."
 
The most advanced AC-conditioning technology in use. Not only does the AC-Curator circuitry filter the high frequency but it also filters the low frequency spurious noise generated through the AC power line by other equipment or nearby machinery.

AC Curator.
 
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Thanks Norman, I guess I really need to look into that Sweetcord tomorrow....

Now, I don't know if I ever had any kind of credibility, but what I'm about to say now will definitely ruin it forever if so....

Get this. I was sitting in the sofa, watching some television while I suddently hear voices (no pun intended) from the other side of the room, where the amps and loudspeakers are, so I walk over to listen carefully. TV and hi-fi gear is not connected in any way. It's quite loud, but not very clear, it's some kind of message being repeated over and over again in english... it sounds like a transmission from a plane or maybe a UFO?! The only thing I understand is something about "need more power".

Now.... how in **** was that possible, what did I just pick up? Was it the monos doing this?! What kind of frequency are they operating at really?! Something is definitely weird here.....

And no, I'm not crazy... my wife heard it too.... I promise!
 
haha... :)

This shit is crazy though... I don't think I dare to sleep with the monos turned on... if I can sleep at all that is... :) I think I'll have to take the burn-in process slowly...
 
You are one of us now. Enjoy.

VoicesInMyHead said:
haha... :)

This shit is crazy though... I don't think I dare to sleep with the monos turned on... if I can sleep at all that is... :) I think I'll have to take the burn-in process slowly...
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Jack said:
Seems like the recent changes in your system setup has caused a pretty healthy RFI problem.
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You could say that... :)

So I've always read that the Lampi Atlantic DAC could be a bit "microphonic" due to its 4P1L tubes, but haven't really thought so much about it until now, but I guess the combination of my DAC, preamp and amps it has turned into one heck of a microphone... quite scary actually....
 
Only worry if the Jobs start walking around the house or cooking themselves some breakfast. I would say burn those suckers in!
 
VoicesInMyHead said:
You could say that... :)

So I've always read that the Lampi Atlantic DAC could be a bit "microphonic" due to its 4P1L tubes, but haven't really thought so much about it until now, but I guess the combination of my DAC, preamp and amps it has turned into one heck of a microphone... quite scary actually....
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Now you can find out what Putin is up to. LoL
 
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