ben_
Active Member
Hello forum,
After a few month hesitating about buying a used power amp, I finally found something matching my speakers needs (150 WPC and stable into below 3 ohms load) and bought a NAD 2600PE locally for a reasonnable price.
I went to the previous owners place and listened to the amp on Martin Logan Scenario speakers, with what I think was a D-stream network streamer source (from both Qobuz and local flac files) and it worked flawlessly. This amp has not much controls to test, so I switched it on and off to check for any protection noise and played the L&R volume pots from 0 to maximum without hearing a single static or plop. Sounded great overall, we listened to few tracks and talked a little about audio stuff, then I took it without a doubt it will be great with my Focal speakers.
Back home I've tried to plug it to two different speakers and two different sources and cables and it has the same issue with apparent noise and cutouts on the left channel, nothing loud or harsh sounding though.
This amp was serviced in 2016, because it didn't want to turn on at the time. Seller give me the invoice, and was done :
- Refurbished mains voltage selector
- Repaired power section solders + power supply
- Changed coupling capacitor on input stage, driver and power supply
- Bias current control
- Controls and test
Seller said it has worked great since this repair, and I tend to think he is honest because I hear it working.
I guess it may have a dried soldier or a bad connection in protection relay and the issue just got worse or made audible because I moved it by car or it stayed in the trunk the whole afternoon (it was a little hot that day, like 30C / 86F but car was in the shadow). I'm saying this because tapping on the case near the relay and speaker binding spot has an effect on it, like it goes into contact again for a few instants.
So, I'm heading to open it, open and deoxit the speaker protection relays, inspect for any dried solder, also cleaning the two volume pots while I'm on it. I have already done that on other (integrated) amps
I don't own or have access to a scope, and I just checked DC on speakers output with a cheap multimeter and its 0.02mV on L and 0.01mV on right at full volume, seems ok to me but I'm no specialist.
Do you think it may be the relay issue and do you see something else I should do while on it ?
Many thanks
After a few month hesitating about buying a used power amp, I finally found something matching my speakers needs (150 WPC and stable into below 3 ohms load) and bought a NAD 2600PE locally for a reasonnable price.
I went to the previous owners place and listened to the amp on Martin Logan Scenario speakers, with what I think was a D-stream network streamer source (from both Qobuz and local flac files) and it worked flawlessly. This amp has not much controls to test, so I switched it on and off to check for any protection noise and played the L&R volume pots from 0 to maximum without hearing a single static or plop. Sounded great overall, we listened to few tracks and talked a little about audio stuff, then I took it without a doubt it will be great with my Focal speakers.
Back home I've tried to plug it to two different speakers and two different sources and cables and it has the same issue with apparent noise and cutouts on the left channel, nothing loud or harsh sounding though.
This amp was serviced in 2016, because it didn't want to turn on at the time. Seller give me the invoice, and was done :
- Refurbished mains voltage selector
- Repaired power section solders + power supply
- Changed coupling capacitor on input stage, driver and power supply
- Bias current control
- Controls and test
Seller said it has worked great since this repair, and I tend to think he is honest because I hear it working.
I guess it may have a dried soldier or a bad connection in protection relay and the issue just got worse or made audible because I moved it by car or it stayed in the trunk the whole afternoon (it was a little hot that day, like 30C / 86F but car was in the shadow). I'm saying this because tapping on the case near the relay and speaker binding spot has an effect on it, like it goes into contact again for a few instants.
So, I'm heading to open it, open and deoxit the speaker protection relays, inspect for any dried solder, also cleaning the two volume pots while I'm on it. I have already done that on other (integrated) amps
I don't own or have access to a scope, and I just checked DC on speakers output with a cheap multimeter and its 0.02mV on L and 0.01mV on right at full volume, seems ok to me but I'm no specialist.
Do you think it may be the relay issue and do you see something else I should do while on it ?
Many thanks
Last edited:
it was the relay