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I took a Lexicon NT 212 (re-branded Bryston 3B-ST) power amplifier out of storage for a secondary system. The NT 212 had been on the fritz, but still functioned.
Since buying the NT 212 years ago within the used marketplace, the first issue had been that the amplifier took longer than the normal 4 second delay for the soft start feature to power-on the amplifier, but without any issue once the amplifier powered-on. In every other respect, the amplifier had been stable and trouble-free.
Yesterday, the amplifier did not power-on at all, as dead as a doornail. So I checked the pair of fuses located in the IEC inlet fuse holder, and found that both fuses were blown. I then replaced the fuses with the proper 4A fuse value and plugged the NT 212 into a GFCI protected AC outlet to see if the device would power-on:
With the power switch in the off position, I plugged-in the power cord and immediately saw that the two LED indicator lights were illuminated. Pressing the switch to the on/off positions does not change the indicator lights. Even though not under load for the test to help discharge the power supply caps, when the switch stays in the off position for approx 2 hours, the pair of green indicator lights still remain illuminated. The enclosure is moderately warm to the touch, very typical of the NT 212 while in idle, so it seems to be powered-on. Note: The remote trigger switch is in the off position, so that aspect does not seem to be an issue.
I wish to avoid the next step of testing the NT 212 under load until I get an idea of what may have happened, or what might be happening at this time. If the amplifier remains powered-on 24/7 no matter the position of the power switch, that is no problem as long as the NT 212 remains stable and safe under load. Any thoughts? TIA
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Topic - Power-on funtion of amplifier on the fritz. - Duster 17:42:09 07/12/17 (15)
- RE: Power-on funtion of amplifier on the fritz. - AJ 07:05:07 07/14/17 (0)
- Update: Power-on funtion of amplifier on the fritz. - Duster 14:44:44 07/13/17 (2)
- My only thought is 'if it ain't broke, don't fix it' . nt - 3+4=5 16:31:25 07/13/17 (1)
- If the fuses remain stable, it's all good (nt) - Duster 16:41:21 07/13/17 (0)
- RE: Power-on funtion of amplifier on the fritz. - rkeman 13:18:06 07/13/17 (1)
- Brystom has a Bryston only repair shop in New England. For all US products. - 3+4=5 14:04:25 07/13/17 (0)
- My guess, with blown fuses.. switch and or relay is 'welded' 'open' - 3+4=5 10:54:42 07/13/17 (2)
- good answer, but don't you mean welded closed? - madisonears 18:40:41 07/13/17 (1)
- RE: good answer, but don't you mean welded closed? - Duster 22:57:43 07/13/17 (0)
- Confused - madisonears 18:31:58 07/12/17 (5)
- RE: Confused - Duster 19:13:35 07/12/17 (4)
- RE: Confused - fstein 09:23:08 07/13/17 (3)
- RE: Confused - Duster 09:48:09 07/13/17 (2)
- Was it unplugged while powered up? The pop of unplugging might have blown fuses? - 3+4=5 13:21:15 07/14/17 (1)
- RE: Was it unplugged while powered up? The pop of unplugging might have blown fuses? - Duster 15:30:30 07/14/17 (0)