> Spot on, Jim.
> The 76A and the 78 suffer from both vibration and turbulence, with the
> effects compounded by resonances in the sheet metal cover.
*** I do have some "Dynamat" left over from a car project. I might try
a few pieces of that stuck to the top & sides - in places where there's
nothing for it to short out if it comes loose - which doesn't seem very
likely; the stickum on Dynamat is extremely agressive. The casing is
pretty thick metal - but it sure does ring like a bell when you tap it.
>
> Better blower mounting and fuzz would help a lot, a scattering of braces
*** By "braces" I assume you mean narrow strips of metal welded to the
case so they stand up at right angles to it? My cover has a couple real
good
scratches in the top, so it needs to be bodyworked anyway. Unfortunately,
according to Mr. Magnet, it's aluminum. I do have a spool gun for my MIG
welder that's supposed to be able to weld aluminum, but I've never tried
it yet. And that's assuming it's a weldable *alloy*.
The amp came to me without rear feet, so the back of the cabinet is
resting on the desk. I have ordered new feet from RF Concepts, along
with the new blower.
- Jerry Kaidor
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