Wotan1
100+ Head-Fier
- Joined
- Jun 3, 2007
- Posts
- 351
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This is to much to handle. The amp died on me twice and history repeated itself 100%. It's a portable amp with a rechargable battery pack included (inside)
Same history both times
Recieved amp (according to supplier battery pack inside was fully charged, with the capacity of 50 hours fulltime listening). Sounded great out of the box. I was not using a power supply. Listened for an hour and shut down the amp. Wanted to listen again a couple of hours later. I plugged the HP plug in the amp. When I pushed the power button the led started shining for a second and then died. So I suspected that the batteries were empty.
I went out the buy a PSU, within specs of supplier (24v, regulated, 500mA center positive plugs) Made sure center was connected to the +. Also had the adapter checked by an eletronics specialist for voltage. It measured 23.7V. Installed the adapter. Pushed the switch, got a led light for .1 second and then nothing.
Had to return the amp. According to service the primary electrolytic capacitors in the amp were blown. Amp was repaired and returned.
And then the history discribed above happened exactly the same. With the difference that
1) I bought a new PSU recommended by an headfier (an Ansmann).
2) heard some static noice when connecting the HP jack to the amp (switched off)
3) Noticed some sparkels when I connected the connector of the power supply to the amp (amp was already dead at that time, but I hope it could be rivived)
I checked and doubble checked the voltage and polarity before hitting the switch. Got a led for .01 second and then nothing..
So
> why did the amp stopped working at the 2nd round of listening. Batteries were fully charged and should have run for an other 48 hours or so. PSU was not used yet.
> Why the static when plugging in the HP's with amp of
> Are the adaptors playing a roll here or did the amp already died at the 2nd round of listening.
> What about the sparkels when connecting the addapter to the amp.
> I also heard some pulsing sound at one time when listning and hoping the amp would live again. The led in the PSU was pulsing as well.
The supplier has no idea. They personally tested the amp at 26.5 volts as 27 volts is the max recommended. So they do not know why it did survive this voltage for days yet die with 23v. So they blame it on the voltage or polarity. But what are the changes. Two different adapters both measured by an expert having resp 23,7 and 23.8v (in the last case I started with 20V).
Any suggestions on what could have happened are very much appreciated.
PS: Please note that this is a very good amp. I'm the only one having this issue. All users are very happy with the product and from what I have heard I would recommend this amp to everyone.
Same history both times
Recieved amp (according to supplier battery pack inside was fully charged, with the capacity of 50 hours fulltime listening). Sounded great out of the box. I was not using a power supply. Listened for an hour and shut down the amp. Wanted to listen again a couple of hours later. I plugged the HP plug in the amp. When I pushed the power button the led started shining for a second and then died. So I suspected that the batteries were empty.
I went out the buy a PSU, within specs of supplier (24v, regulated, 500mA center positive plugs) Made sure center was connected to the +. Also had the adapter checked by an eletronics specialist for voltage. It measured 23.7V. Installed the adapter. Pushed the switch, got a led light for .1 second and then nothing.
Had to return the amp. According to service the primary electrolytic capacitors in the amp were blown. Amp was repaired and returned.
And then the history discribed above happened exactly the same. With the difference that
1) I bought a new PSU recommended by an headfier (an Ansmann).
2) heard some static noice when connecting the HP jack to the amp (switched off)
3) Noticed some sparkels when I connected the connector of the power supply to the amp (amp was already dead at that time, but I hope it could be rivived)
I checked and doubble checked the voltage and polarity before hitting the switch. Got a led for .01 second and then nothing..
So
> why did the amp stopped working at the 2nd round of listening. Batteries were fully charged and should have run for an other 48 hours or so. PSU was not used yet.
> Why the static when plugging in the HP's with amp of
> Are the adaptors playing a roll here or did the amp already died at the 2nd round of listening.
> What about the sparkels when connecting the addapter to the amp.
> I also heard some pulsing sound at one time when listning and hoping the amp would live again. The led in the PSU was pulsing as well.
The supplier has no idea. They personally tested the amp at 26.5 volts as 27 volts is the max recommended. So they do not know why it did survive this voltage for days yet die with 23v. So they blame it on the voltage or polarity. But what are the changes. Two different adapters both measured by an expert having resp 23,7 and 23.8v (in the last case I started with 20V).
Any suggestions on what could have happened are very much appreciated.
PS: Please note that this is a very good amp. I'm the only one having this issue. All users are very happy with the product and from what I have heard I would recommend this amp to everyone.