NAttD!

[Toe-Knee]

my Marshall is 43 years old, and nearly blew up my Weber Mass 100!! :)  there was smoke billowing out of it!  luckily we spotted it straight away and it seems to be fine.

it's a good attenuator, i'm very happy with it, but from that experience i would repeat Weber's advice that your attenuator should be rated at about twice the wattage of the amp.  i'll only be using it with 50 watters from now on :)

you could still use it just at lower MV settings.

Id check on the internal resistors and speaker motor though after billowing smoke. Smoke only happens when something is damaged!

[blue]

oh, the lesson was learnt.  i was with a tech at the time, he checked it over and luckily it was just some adhesive that had smoked when it got hot.  it was a good warning before it actually failed!  we were trying out the amp with a Divo OV4 in it, self biasing unit, so we were winding it up to see how it fared.  i wouldn't normally have it cranked as high as that.  there is no master volume on this baby, hence the attenuator, which is rated at 100 watts, while the amp at full tilt is putting out more like 130.  it was careless of us, and we're lucky we just got a bit of smoke to scare us.  we won't make that mistake again!

[Toe-Knee]

oh, the lesson was learnt.  i was with a tech at the time, he checked it over and luckily it was just some adhesive that had smoked when it got hot.  it was a good warning before it actually failed!  we were trying out the amp with a Divo OV4 in it, self biasing unit, so we were winding it up to see how it fared.  i wouldn't normally have it cranked as high as that.  there is no master volume on this baby, hence the attenuator, which is rated at 100 watts, while the amp at full tilt is putting out more like 130.  it was careless of us, and we're lucky we just got a bit of smoke to scare us.  we won't make that mistake again!

That all makes sense.

I just didnt want you to go on using it without it being checked incase something crucial had gone which could lead to impedance mismatches etc.

Fire & Smoke is always the best reminder that sometimes you need to be cautious. Electric shocks are another....