2. amps-preamps
  3. 1202697301

Belles 350a reference fireworks

I turned on my Belles 350A reference yesterday, and was greeted by a flash, then a wisp of smoke coming from the right hand side of the unit. White noise emanated from my SP Tech timepiece 3.0's. I turned the amp off immediately, but needless to say I'm worried--mostly about my speakers. My 350 does NOT have the soft-start, which I'm guessing is the problem. Now i'm torn: after reading a couple of other similar stories about the amps putting out DC and frying speakers (not to mention the amp itself), I'm unsure of whether I should send the amp back to Dave Belles for repair/soft-start upgrade, or just scrap the beast and go with something more user friendly/reliable. The sound I was getting from my Belles/Modwright pre, and the SP Tech (amazing speakers, btw), was great, but I've got a case of the jitters about the 350 now. Has anyone sent theirs in for the soft-start and have an opinion? I don't want to spend the money on repair/upgrade, if there will still be reliability issues...

thanks,

david
davidm1108
dwright
35 posts
 
Hi guys, this is Dan Wright from ModWright Intruments Inc. It has come to my attention that some people have had trouble with some of our earlier 9.0SE preamps and the Belles AC coupled amp. Our earliest units did allow for elevated DC levels right at power up due to a brief delay between when the mute circuit actuated the mute relay and when the B+ was energized.

This has been addressed in more current units and of course addressed with the tube-rectified supplies. If you have any questions, please don't hesitate to contact me via email at modwright@yahoo.com.

The proper and ideal way to power up and down any system is as follows:

1) Power up preamp.
2) Power up amp.

Powering Down:
1) Power down amp.
2) Power down preamp.

Thanks,

Dan W.
davidm1108 OP
17 posts
 
this is why modwright has the rep they do. class company.
ladycharnet's avatar
ladycharnet
59 posts
 
I power up ARC pre-amps, on mute, power on head gear used, power on DAC, then power on the power amplifiers.

To shut down, I put the pre-amps in mute, power off the power amps, then power off the DAC, power of the head gear used, then power of the pre-amplifiers.
I think this is the correct method?
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