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Post by PinkFloyd on Apr 14, 2010 19:24:11 GMT
Just opened my new amp up for a sniff about under the bonnet and came across these sitting next to the toroidal transformer: Bulbs? a new one on me
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Post by puffin on Apr 14, 2010 19:32:00 GMT
"when it's spring again i'll bring again......." Is it Dutch
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Post by PinkFloyd on Apr 14, 2010 20:23:47 GMT
"when it's spring again i'll bring again......." Is it Dutch Just what I thought....... No... it's a NAD
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Post by PinkFloyd on Apr 14, 2010 21:58:22 GMT
Frans, Leo, Alex...... anybody? "bulbs" ? Do I water them? Do I plant them? Do I plug them in to a light socket? I've had a peek inside the "bulb" containers and, yes, they are lamps with "springs" attached..... some sort of protection device maybe? Mike.
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Post by PinkFloyd on Apr 14, 2010 22:01:49 GMT
By the way.... I Googled Nad bulbs and got this: "Solve Your "bulb" Problem Now! Click here to get instant support from our best Experts!" Totally fekkin useless
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Post by PinkFloyd on Apr 14, 2010 22:03:14 GMT
I NEED IMMEDIATE "support" for my bulbs.... they are starting to wither
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Deleted
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Post by Deleted on Apr 14, 2010 22:51:14 GMT
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Post by PinkFloyd on Apr 14, 2010 22:59:20 GMT
Cheers Syd.....
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leo
Been here a while!
Team wtf is it?
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Post by leo on Apr 14, 2010 23:15:14 GMT
Only just seen this thread, anyway using bulbs instead of thermistors, that sounds a bright idea sorry
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Post by Deleted on Apr 15, 2010 14:59:24 GMT
a (halogen) bulb has a better suited resistance range and faster reaction time (reacts fast and cools down slower) as a 'normal' PTC at the needed current demands. What typenumber amp are they mounted in ?
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Post by PinkFloyd on Apr 15, 2010 19:52:35 GMT
a (halogen) bulb has a better suited resistance range and faster reaction time (reacts fast and cools down slower) as a 'normal' PTC at the needed current demands. What typenumber amp are they mounted in ? Hi Frans, The el cheapo NAD C315 BEE (a very nice amp for the money btw) Mike.
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Post by Deleted on Apr 16, 2010 6:29:48 GMT
NAD makes very nice amps indeed !
the older ones had a tendency to blow themselves up thermically from time to time. They purposely didn't use emitter resistors (for their own reasons) which prevent thermal runaway. Repaired a lot of those 'oldies' (talking 15 years ago)
Frans
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Post by PinkFloyd on Apr 16, 2010 19:23:14 GMT
It really is an incredible amp for the money Frans.... £149 GBP. Remote control, motorized potentiometer, toroidal transformer.... I just don't know how they can do it for the money. It's maybe a tad recessed in the midband but, apart from that, a good solid performer. I certainly didn't expect it to sound "this" good for the asking price!
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Post by PinkFloyd on Apr 16, 2010 19:24:22 GMT
Just wondering whether those opamps are in the signal path or are part of the servo..... TLO82
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Post by Deleted on Apr 16, 2010 20:30:10 GMT
If there are highohmic resistors 1M-10M Ohm and/or large caps close by (1uF or bigger) it might very well be the DC servo. In this case TL082 would make some sense. a lower-noise type would also couple less noise in the feedback loop of the amp. The amp itself seems to be constructed of all transistors. Don't have acces to the schematics of newer amps.
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Post by PinkFloyd on Apr 17, 2010 9:48:09 GMT
If there are highohmic resistors 1M-10M Ohm and/or large caps close by (1uF or bigger) it might very well be the DC servo. In this case TL082 would make some sense. a lower-noise type would also couple less noise in the feedback loop of the amp. The amp itself seems to be constructed of all transistors. Don't have acces to the schematics of newer amps. Frans, I have already fitted dip8 sockets and am currently running OPA2107 instead of the TLO82.... can't say I notice "any" improvement
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Post by Deleted on Apr 17, 2010 19:23:21 GMT
If the noisefloor of the IC was already below the hearing treshold you'll very likely hear no improvement.
More then likely the opamp is in the DC Servo feedback. This would easily explain why you did not notice sonic improvements as no audio passes through the DC Servo.
You can leave the OPA2107 in. It's an excellent opamp.
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