Nap 140 problem
Posted by: monkfish on 15 November 2003
Hi
I bought a Nap 140 power amp (olive front), the power is coming on when the switch is operated but there is then a loud hum through the speakers.
The unit was tested using my mates 32 pre (he uses a Nap 90 full width case model power amp).
Anybody any idea of what's wrong and the likely cost of putting it right
Regards
Jim
I bought a Nap 140 power amp (olive front), the power is coming on when the switch is operated but there is then a loud hum through the speakers.
The unit was tested using my mates 32 pre (he uses a Nap 90 full width case model power amp).
Anybody any idea of what's wrong and the likely cost of putting it right
Regards
Jim
Posted on: 15 November 2003 by J.N.
Hi Jim
I think a 32 like a 32.5 needs a blanking plug in one of its output sockets if it is receiving its power from the power amp (i.e. no dedicated p/s for the pre-amp).
Do you have the blanking plug inserted?
I think a 32 like a 32.5 needs a blanking plug in one of its output sockets if it is receiving its power from the power amp (i.e. no dedicated p/s for the pre-amp).
Do you have the blanking plug inserted?
Posted on: 15 November 2003 by monkfish
Hi J. N.
I didn't look but I'm fairly sure the Nap 32 can only be powered via a single rail P\S or via a NAP power amp and there is no shorting plug.
We removed my mates Nap 90 and substituted the 140 (no external power supplies used) and got a loud hum from the speakers.
Regards
Jim
I didn't look but I'm fairly sure the Nap 32 can only be powered via a single rail P\S or via a NAP power amp and there is no shorting plug.
We removed my mates Nap 90 and substituted the 140 (no external power supplies used) and got a loud hum from the speakers.
Regards
Jim
Posted on: 16 November 2003 by JeremyD
A few months ago I upgraded from a 90 to a 140.
The 90, on being switched on, simply made two thumps.
With the 140, the speakers growl and then loudly buzz before the second thump - after which everything seems fine, with less background hiss than on the 90. I have assumed until now that this must be normal for a 140 - am I mistaken?
BTW, musically the 140 is far less dependent than the 90 was on either the time of day or what else is plugged into the mains [Lingo excepted]. However the 140 reproduces occasional interference [such as the central heating boiler taking its time to ignite the oil] far more vividly, crisply and (dare I say it) with better PR&T than the 90 could hope to...
PS I don't have an external power supply for my 102. Since I sold my Lingo recently (to raise some needed cash) I'm now using the system without the turntable connected, which means that my un-earthed CD player and cassette deck are the only source components. Disconnecting the turntable resulted in negligible sonic degradation and a significant improvement in the sound of my CD player.
--J
[This message was edited by JeremyD on SUNDAY 16 November 2003 at 12:18.]
The 90, on being switched on, simply made two thumps.
With the 140, the speakers growl and then loudly buzz before the second thump - after which everything seems fine, with less background hiss than on the 90. I have assumed until now that this must be normal for a 140 - am I mistaken?
BTW, musically the 140 is far less dependent than the 90 was on either the time of day or what else is plugged into the mains [Lingo excepted]. However the 140 reproduces occasional interference [such as the central heating boiler taking its time to ignite the oil] far more vividly, crisply and (dare I say it) with better PR&T than the 90 could hope to...
PS I don't have an external power supply for my 102. Since I sold my Lingo recently (to raise some needed cash) I'm now using the system without the turntable connected, which means that my un-earthed CD player and cassette deck are the only source components. Disconnecting the turntable resulted in negligible sonic degradation and a significant improvement in the sound of my CD player.
--J
[This message was edited by JeremyD on SUNDAY 16 November 2003 at 12:18.]
Posted on: 27 November 2003 by monkfish
Hi
Thanks for the replies, the 140 has been checked by Robert Richie and has been given a clean bill of health. The problem we were experiencing was obviously down to a fault in my mates system or the connections made.
As it wasn't my system I thought it best not to proceed any further when the hum occured in case of any damage to his speakers.
Regards
Jim
Thanks for the replies, the 140 has been checked by Robert Richie and has been given a clean bill of health. The problem we were experiencing was obviously down to a fault in my mates system or the connections made.
As it wasn't my system I thought it best not to proceed any further when the hum occured in case of any damage to his speakers.
Regards
Jim
Posted on: 31 December 2003 by JeremyD
Thanks for the Reply, Andy - I forgot to check whether anyone had answered until now. There was no change to speak of when trying difference combinations of source or no source. However, there has been an improvement since then - "gRRRRRR-bzzzZZZt" has turned into "zzzzzz". I wonder if it could be related to the state of the household's earth?
I'll have contact my dealer soon anyway, as I'm going to sell my amp and speakers soon, so I'll ask him.
I'll have contact my dealer soon anyway, as I'm going to sell my amp and speakers soon, so I'll ask him.
Posted on: 31 December 2003 by JeremyD
Thanks, Patrick. I definitely had the correct Lingo lead, though. The problem is that nothing explains why the 90 didn't buzz. Since I bought the 140 from my dealer I really should have told him about the noise as soon as I got it but it sounded too good after the second thump for me to be concerned about it!
Posted on: 01 January 2004 by JeremyD
Well, my main disincentive is that I don't have a length of wire!