overheating 250
Posted by: scottyhammer on 28 September 2003
hello guys,
before i take the plunge can anyone enlighten me on the new 250. does it have an internal trip when overheating like the old 250?? OR . have naim overcome this problem with the new 250.?? ive heard its a complete new design, is this true.??
would appreciate your input. cheers.
before i take the plunge can anyone enlighten me on the new 250. does it have an internal trip when overheating like the old 250?? OR . have naim overcome this problem with the new 250.?? ive heard its a complete new design, is this true.??
would appreciate your input. cheers.
Posted on: 28 September 2003 by scottyhammer
quote:OH COME ON GUYS SOMEONE OUT THERE MUST BE ABLE TO COMMENT!!!
Originally posted by scottyhammer:
hello guys,
before i take the plunge can anyone enlighten me on the new 250. does it have an internal trip when overheating like the old 250?? OR . have naim overcome this problem with the new 250.?? ive heard its a complete new design, is this true.??
would appreciate your input. cheers.
Posted on: 28 September 2003 by quickie
You only asked the question just over an hour ago
Posted on: 28 September 2003 by scottyhammer
sorry, time drags when your hanging around
Posted on: 28 September 2003 by garyi
Scot, a bit of history might help out here, have you had previous problems with over heating 250s?
Posted on: 28 September 2003 by scottyhammer
no not me personally but a pal had one that switched off a lot when driven hard especially with rock. he had difficult linn kielidh speakers.
Posted on: 28 September 2003 by quickie
Can't seem to shut mine down,no matter how hard I try 
Paul.
Paul.
Posted on: 28 September 2003 by Not For Me
My 250 used to regularly shut down with Keilidhs, especially on bass heavy dance music.
You get used to it after a while, a period of silence for 20 - 30 minutes until resst.
Have no insight as to whether the new 250 is better in this respect, but I would hope so, as the transistors should be more modern and efficent
Someone with experience of both care to comment?
DS
You get used to it after a while, a period of silence for 20 - 30 minutes until resst.
Have no insight as to whether the new 250 is better in this respect, but I would hope so, as the transistors should be more modern and efficent
Someone with experience of both care to comment?
DS
Posted on: 01 October 2003 by Stevo
I'm using an olive 250 with Kabers and it's never shut down on me.
It does get rather warm though.....
Stephen
It does get rather warm though.....
Stephen
Posted on: 01 October 2003 by Tuan
quote:
Originally posted by scottyhammer:quote:OH COME ON GUYS SOMEONE OUT THERE MUST BE ABLE TO COMMENT!!!
Originally posted by scottyhammer:
hello guys,
before i take the plunge can anyone enlighten me on the new 250. does it have an internal trip when overheating like the old 250?? OR . have naim overcome this problem with the new 250.?? ive heard its a complete new design, is this true.??
would appreciate your input. cheers.
Various conversations with Richard (Dane) of Naim Audio regarding the Naim amplification (NAP250 and NAP300 compared to the NAP135s) indicate that the new NAP250 is much better in term of handling speakers with difficult loads. The protection circuitry is all new design and does address the overheating problem of the older NAP250. The new NAP250 can drive speakers of impedance around 4 ohm for a long time at high volume settings. Well, how loud is loud enough for you... Only models designed with active cooling (NAP135, NAP145V, NAP300, NAP500) will have better cooing than the new 250 (but keep it in mind that the new NAP250 is more powerful than a pair of 135 interm of its output thanks to the new transistors 007. Therefore, I think that the new NAP250 is quite equivalent to a good pair of NAP135s. If you want absolute warranty that the amplification will not shutdown due to heating, buy the models that have active cooling (with fans).
Posted on: 03 October 2003 by NaimDropper
I have Mark's old style 250. It rocks with my Briks and has never shut down. 250's just seem to crank out the music all day long. Even with loud and extended listening sessions it never gets more than just warm to the touch.
My installation provides decent ventilation around it, that makes a big difference in any convection cooled device.
Was your friend running NACA5? Much better "pipes" than NACA4 and if you're not using proper cable the 250 (and other Naim amps) can oscillate, which would cause them to heat and potentially shut down.
David
My installation provides decent ventilation around it, that makes a big difference in any convection cooled device.
Was your friend running NACA5? Much better "pipes" than NACA4 and if you're not using proper cable the 250 (and other Naim amps) can oscillate, which would cause them to heat and potentially shut down.
David
Posted on: 03 October 2003 by herm
quote:
Originally posted by scottyhammer:
a pal had one that switched off a lot when driven hard especially with rock. he had difficult linn kielidh speakers.
Sorry, but I find it hard to believe Keilidhs are a difficult load. I used to drive Keilidhs with a 250, till I changed the Ks for Epos 22s, which surely need more power. The Ks are now on my (2nd sistem-) 180, and neither amp gets remotely hot.
But hey, I'm not doing any dance marathons.
Herman