They sound even clearer filled with clear water....
You could actually fill it with de-ionised water
(please don't)
It's a pity Photobucket became so restrictive, as I did exactly that with the Velleman K4000 I made 35 years ago, but the photos have gone. Ventilation holes drilled above the eight EL34s allowed it to breathe, and in the ten or so years it was used like that it never sagged. I still use the amp, but after rebuilding it (for the second or third time!) it now has a perforated steel cover.Pic of a valve amp using plastic casing near/over/around the valves please.
Interesting to see the amps on the link with the huge heatsinks used in the wrong orientation, suggesting that the heatsinks are window-dressing/bait, so probably running very cool.
Also interesting that the plastic is used in small slabs, and not formed, on a SS amp'.
To stop any plastic sagging over a wide span when even gently heated over hours, days, months...….……………….
"They told me I couldn't build a castle in the swamp, they said it would sink. But I built it anyway. It sank into the swamp. So I built another one. That fell down and sank into the swamp. So I built another..."I still use the amp, but after rebuilding it (for the second or third time!) it now has a perforated steel cover.
Rebuilt as in modified and upgraded. It always worked, it just works better now. Like the active crossover I built in 1983, continually upgraded and still in use. With the Velleman K4000. And the Concordant clone pre, also rebuilt more than once. All still working, never sank."They told me I couldn't build a castle in the swamp, they said it would sink. But I built it anyway. It sank into the swamp. So I built another one. That fell down and sank into the swamp. So I built another..."