quiller
New member
Thanks, Joe!
I can't wait to give it a good run this evening!
JP
I can't wait to give it a good run this evening!
JP
Last edited:
JOB 225 2-channel Power Amplifier ... update ...
- Thread starter joeinid
- Start date
Jack
Active member
newbie79
I just picked up the Wyred-4-Sound STP-SE and should have it by the first of the week at the latest. It is a full featured Passive/Active that should fit the bill. I will let you know but the reviews are positive and I have sent an e-mail to Srajan to see what he thinks about the pairing since he has reviewed/used both. If you are diligent you should be able to find one for a fair price on Agon or other sites.
I just picked up the Wyred-4-Sound STP-SE and should have it by the first of the week at the latest. It is a full featured Passive/Active that should fit the bill. I will let you know but the reviews are positive and I have sent an e-mail to Srajan to see what he thinks about the pairing since he has reviewed/used both. If you are diligent you should be able to find one for a fair price on Agon or other sites.
airbubble
New member
I posted this in our Aussie forum but since the Job is not plntiful just yet in Australia I thought I might get a better response here.
I lent the Job Amp to someone with very demanding speakers and he was worried the heatsink was getting too hot after 1/2 an hour. Could not hold his hand on the heatsink for longer than a mili-second.
I just looked up the Exicon 10N20R and 10P20R (from the review there are A total of eight Exicon Mosfets) that are attached to the heatsink.
Reading the PDF from here http://www.profusion...artno=ECX10N20R
It looks like they have a channel temp of 150 degrees celius if I am reading it right.
Would that mean it should be fine if the heatsink is too hot to touch within reason? What would be a high temp of the heatsink when it might be too high?
Might lend him my heat gun to check the temps if he would like to try it again.
The Amp is been on all day with low level listening and it is 45 degrees right now.
When I was driving it harder in the day it reached 55 degrees on very effecient 6 ohm speakers.
I lent the Job Amp to someone with very demanding speakers and he was worried the heatsink was getting too hot after 1/2 an hour. Could not hold his hand on the heatsink for longer than a mili-second.
I just looked up the Exicon 10N20R and 10P20R (from the review there are A total of eight Exicon Mosfets) that are attached to the heatsink.
Reading the PDF from here http://www.profusion...artno=ECX10N20R
It looks like they have a channel temp of 150 degrees celius if I am reading it right.
Would that mean it should be fine if the heatsink is too hot to touch within reason? What would be a high temp of the heatsink when it might be too high?
Might lend him my heat gun to check the temps if he would like to try it again.
The Amp is been on all day with low level listening and it is 45 degrees right now.
When I was driving it harder in the day it reached 55 degrees on very effecient 6 ohm speakers.
Amazon feedback from Jobsys website:
5.0 out of 5 stars
Job delivers 5 stars, June 4, 2013
By B. Cunningham
(Amazon Verified Purchase)
This review is from: JOB 225 2-channel Power Amplifier (Electronics)
So far so good. I tracked the package from Switzerland to the USA in about 3 days. My package suffered some abuse in route with one of the plastics straps on the outer box having come completely off, and the box exterior deformed. Fortunately the inner box largely survived and the amp was unharmed. Personally I think the packaging should be a bit more robust for this journey. But it does come encased in a nice elastic cloth bag and suspended in foam.
Aesthetically the Job faceplate is very beautiful, and the rear heatsink is more robust and nicer than expected. The remainder of the chassis is fairly average and the rear speaker outputs being largely plastic are the only bit hinting at cheapness. Thusfar, I have pulled a high end Jeff Rowland Concerto out of my biamped system and inserted the Job to handle the frequencies below 500hz. The Job sounds more controlled in this region and seems to mate more seamlessly with my 300b monoblocks driving the upper frequencies.
I am impressed and happy with the purchase. It is a small yet sweet amplifier. It does generate a fair bit of heat which is a good sign in my experience. After it warms up fully, you will be challenged to keep a finger on the heat sink for more than 4 seconds. Other than the packaging my only complaint is that the yellow-orange LED on the front panel is too bright if you like to listen in the dark.
Update 6/20/2013: After living with the amp some time now I have found that the heat generated by the amp has surprisingly dropped dramatically. I do not understand why this should be but after some breakin I find the amp runs much cooler such that you can keep your hand on the heat sink indefinitely, bizarre but that it what I have observed. Additionally, I should comment that the only negatives I have found is that the amp produces significantly more hum than the Jeff Rowland it replaced. Furthermore I do get some popping on the woofers I am driving if I do not turn them on in a specific sequence. All and all I still find it to be a great amp that powers my sub 500hz speakers beautifully.
5.0 out of 5 stars
Job delivers 5 stars, June 4, 2013
By B. Cunningham
(Amazon Verified Purchase)
This review is from: JOB 225 2-channel Power Amplifier (Electronics)
So far so good. I tracked the package from Switzerland to the USA in about 3 days. My package suffered some abuse in route with one of the plastics straps on the outer box having come completely off, and the box exterior deformed. Fortunately the inner box largely survived and the amp was unharmed. Personally I think the packaging should be a bit more robust for this journey. But it does come encased in a nice elastic cloth bag and suspended in foam.
Aesthetically the Job faceplate is very beautiful, and the rear heatsink is more robust and nicer than expected. The remainder of the chassis is fairly average and the rear speaker outputs being largely plastic are the only bit hinting at cheapness. Thusfar, I have pulled a high end Jeff Rowland Concerto out of my biamped system and inserted the Job to handle the frequencies below 500hz. The Job sounds more controlled in this region and seems to mate more seamlessly with my 300b monoblocks driving the upper frequencies.
I am impressed and happy with the purchase. It is a small yet sweet amplifier. It does generate a fair bit of heat which is a good sign in my experience. After it warms up fully, you will be challenged to keep a finger on the heat sink for more than 4 seconds. Other than the packaging my only complaint is that the yellow-orange LED on the front panel is too bright if you like to listen in the dark.
Update 6/20/2013: After living with the amp some time now I have found that the heat generated by the amp has surprisingly dropped dramatically. I do not understand why this should be but after some breakin I find the amp runs much cooler such that you can keep your hand on the heat sink indefinitely, bizarre but that it what I have observed. Additionally, I should comment that the only negatives I have found is that the amp produces significantly more hum than the Jeff Rowland it replaced. Furthermore I do get some popping on the woofers I am driving if I do not turn them on in a specific sequence. All and all I still find it to be a great amp that powers my sub 500hz speakers beautifully.
High Potential
New member
- Joined
- Jun 17, 2013
- Messages
- 6
Very interested in the Job to use in a HT system with KEF LS50. Anyone with experience on this pairing? And what would be a good speaker cable for this pairing?
cheers,
cheers,
Well, I thought it best to double-check anyway. Just got a reply from Job and they say "please read page 6 of the manual and you will see that there is no protection"
Does anyone know how to check a preamp for dc offset with a multimeter? Thanks
Job had an explanation for the tweaks they did to the amp over the summer but took it down later.
From their website now:
and 6Moons commentary below:
[/FONT][FONT=Arial,Helvetica,Geneva,Swiss,SunSans-Regular]Final comments & suggestions[/FONT]: At publication time this amp sold exclusively via Amazon, only as a 117V unit andonly to US customers (even Canadian readers were refused). Job Systems also didn't publish their email to answer inquiries (the owner's manual does have it) to make pre-sales support zero. With 35dB gain and 0.75V input sensitivity, overeager volume controls and/or preamps with high gain will get loud very quickly even on standard 89dB speakers. And without a DC servo, this direct-coupled circuit won't amplify but pass on DC to the speakers. Even a superior valve preamp like my Nagra Jazz occasionally created small crinkly noises to suggest mini incidents of DC leakage when all other solid-state sources were dead quiet. One suspects a DC servo was omitted for sonic reasons but if the firm were interested to broaden the 225's appeal, one might suggest they rethink this particular feature.[FONT=Arial, Helvetica, sans-serif]
[/FONT]
From their website now:
- [FONT=Arial, Helvetica, sans-serif]The JOB Amplifier is DC coupled with a new type of DC Servo Control avoiding any DC offset.
DC coupling is the only way to avoid time error in low frequencies. It avoids the usual boominess of the speakers bass response. So you get [/FONT][FONT=Arial, Helvetica, sans-serif]Tight Bass[/FONT][FONT=Arial, Helvetica, sans-serif].[/FONT]
and 6Moons commentary below:
[/FONT][FONT=Arial,Helvetica,Geneva,Swiss,SunSans-Regular]Final comments & suggestions[/FONT]: At publication time this amp sold exclusively via Amazon, only as a 117V unit andonly to US customers (even Canadian readers were refused). Job Systems also didn't publish their email to answer inquiries (the owner's manual does have it) to make pre-sales support zero. With 35dB gain and 0.75V input sensitivity, overeager volume controls and/or preamps with high gain will get loud very quickly even on standard 89dB speakers. And without a DC servo, this direct-coupled circuit won't amplify but pass on DC to the speakers. Even a superior valve preamp like my Nagra Jazz occasionally created small crinkly noises to suggest mini incidents of DC leakage when all other solid-state sources were dead quiet. One suspects a DC servo was omitted for sonic reasons but if the firm were interested to broaden the 225's appeal, one might suggest they rethink this particular feature.[FONT=Arial, Helvetica, sans-serif]
[/FONT]
Jack
Active member
gist
I've tried mine with SS, tube and now passive and no problem with any of them.
I've tried mine with SS, tube and now passive and no problem with any of them.
- Thread Author
- #514
Jack
Active member
Lutfish
Why would you want to internally bridge the inputs of the JOB or any stereo amp to bi-amp? What is the rest of your setup and what are you trying to accomplish?
Why would you want to internally bridge the inputs of the JOB or any stereo amp to bi-amp? What is the rest of your setup and what are you trying to accomplish?
I have three potential set ups:
Two separate systems, both with the Reference 3a Grand Veenas speakers.
One video system with the Gallo reference 3.5
The main system is driven by the very latest upgrade of Atmasphere MA 1 or recently upgraded Hafler transnova amps, or Melody 2a3 with a Goldpoint passive preamp (which I prefer to the optocoupler preamp Lightspeed).
These very Strong 2 x 250 watts Hafler amps are internally bridged for mono input to allow a stereo amp to be used on each speaker. This is also what I would like try to do with Job's. I rather bridge inside with the very same cable already used by Job, as I have found several external "splitters" to veil the transparency.
If Job is the ticket, I might then look for a flavorful tube preamp to beautify the music towards my subjective liking. Suggestions?
I guess I would welcome any suggestion of an outside splitter that does not interfere, if there is such an animal after all.
Two separate systems, both with the Reference 3a Grand Veenas speakers.
One video system with the Gallo reference 3.5
The main system is driven by the very latest upgrade of Atmasphere MA 1 or recently upgraded Hafler transnova amps, or Melody 2a3 with a Goldpoint passive preamp (which I prefer to the optocoupler preamp Lightspeed).
These very Strong 2 x 250 watts Hafler amps are internally bridged for mono input to allow a stereo amp to be used on each speaker. This is also what I would like try to do with Job's. I rather bridge inside with the very same cable already used by Job, as I have found several external "splitters" to veil the transparency.
If Job is the ticket, I might then look for a flavorful tube preamp to beautify the music towards my subjective liking. Suggestions?
I guess I would welcome any suggestion of an outside splitter that does not interfere, if there is such an animal after all.